Super+Tab already cycled windows, but nothing was drawn, so you chose
blind and could only confirm the choice by arriving. A visible switcher
is muscle memory for anyone arriving from macOS or GNOME, and it was the
last item of roadmap phase 03 that did not need coordination.
Ordered most-recently-used, not by creation, because that is what makes
the gesture useful: one Tab returns to the window you just came from.
Hyprland does not report an MRU order, so it is tracked from focus
changes and keyed by address, which is the only property stable for a
window's lifetime.
The gesture needs three binds rather than two. Tab steps the selection,
and the switch is committed on Super RELEASE -- the only way the
compositor can say the gesture is over. That bind is on the bare
modifier, so it fires on every Super release in the session; commit()
returns immediately when nothing is open, which is what makes it
affordable.
A list of names rather than thumbnails: at a glance you are looking for
"the other terminal", and a row of live previews is slower to read and
far more expensive to draw than this gesture deserves.
The interesting part is the bug. The overlay was built, mapped nothing,
and logged absolutely nothing -- because it declared `required property
var screen` while Variants supplies `modelData`. shell.qml has carried a
comment warning about exactly this since the Bar hit it, and I read that
comment earlier in the same session and still walked into it. A comment
that does not stop the person who read it is an argument for a test, so
per-screen-surface-contract now checks every per-screen delegate takes
its screen from modelData. Verified it catches the exact mistake.
Also fixes a regression from 8be3fc2: settings-pages-contract still
required vitalsIntervalMs on Home, where it no longer is. That contract
was pinning the split-across-two-pages arrangement the same commit
fixed, and I pushed without running it.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Four places in the entire shell could reach Settings. The bar, where a
person looks first, was not one of them -- and Pill has routed
right-click to a secondaryActivated signal all along, which nothing
connected, so the gesture did nothing on every widget in the bar.
Each widget now opens the page that owns its settings: the clock and the
calendar reminder open Date & Time, weather opens Home, the vitals
readout opens Appearance, the status glyphs open Network & Devices, the
media readout opens Sound, and the privacy indicator opens Privacy &
Security. Left-click behaviour is untouched.
Two routing bugs found while picking those destinations, both of the
same kind and both invisible from the code, since each page reads
perfectly well on its own:
weather routed to Appearance while every weather control lives on
Home, so searching "temperature unit" opened a page without it.
vitals routed to Appearance, but the refresh interval sat on Home
while the toggles it governs sat on Appearance -- one concept split
across two pages, which is exactly what the ownership rule forbids.
The interval now sits beside the toggles and Home's stub card is gone.
The jump contract guards the failure mode these share. openSettings()
falls back to Home for an unknown page, sensibly and completely
silently, so a typo or a later rename turns a right-click into "opens
the wrong page" with nothing logged. It also fails a Pill-based bar
widget that leaves right-click unconnected, since that is how the
gesture came to be inert everywhere in the first place.
A third instance of the routing bug is still open: followMouse and
pointerSensitivity sit in the input group, which routes to Keyboard,
while both render on Mouse. Fixing it is a two-line group change in
PreferenceSchema.qml, which codex currently owns, so the contract that
catches all three lands with that fix rather than red.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
hyprlock.conf shipped with Tokyo Night Moon hardcoded in six places, so
choosing light mode left the lock screen dark. Every other surface had
been taught to follow the scheme this week -- kitty, GTK, the launcher,
btop, tmux, neovim -- and this was the one left, which is unfortunate,
because it is the screen a user sees most often and the worst possible
place to find a theming bug: you discover it while locked out of the
machine and cannot fix it from there.
It is now generated from a template on every scheme change, the same
shape kitty, GTK, tmux and btop already use, and seeded by link-dotfiles
so the first lock of a fresh install is themed rather than falling back
to hyprlock's bare grey default. hyprlock is launched fresh on each lock
(`pidof hyprlock || hyprlock`), so it picks the file up with no restart.
The dark output is byte-identical to the file it replaces, ignoring
comments -- verified by diff -- so nothing changes for anyone already in
dark mode.
One detail worth recording: hyprlock takes rgba(r, g, b, a) in DECIMAL,
not hex, so the template carries "R, G, B" triples where every other
theme file in this repository uses hex. Two values are the exception,
sitting inside Pango markup where hyprlock wants ##rrggbb. Getting
either wrong is not a parse error -- hyprlock ignores the value and uses
its own default, silently.
Which is why this has a contract. It generates both schemes into a
fixture, never the live config, and checks that no placeholder survives
substitution, that every colour is a well-formed decimal triple, that
the Pango values are well-formed hex, that a light lock screen is
actually light, and that the two schemes differ at all. Verified it
catches a hardcoded colour left in the template and a light mode built
from the dark palette, which is the original bug exactly.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
panama-command-install-contract matched the literal string
`do "$script"; done`, so it failed the moment that loop gained error
reporting and spanned more than one line -- while the property it exists
to protect, each setup stage running in its own process, was unchanged.
It now checks that property directly: the installer must not source
anything under setup/scripts, and must execute them. Verified it still
catches an installer rewritten to source its stages, which the
first attempt at the replacement did not -- the pattern anchored to the
start of a line, and the sourcing appeared mid-line behind an `if`.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Two things stood between this repository and a machine that could
install it.
The installer aborted on its own first question. The hostname prompt
defaults to N, and the N branch ran `exit` -- so pressing Enter, the
obvious answer when you do not want to rename your machine, skipped the
entire installation and said nothing about it. Declining now just
declines. The installer is also safe to re-run, which is the upgrade
path too: it reports which stages failed instead of scrolling the
failure past twenty minutes ago, and restores the idle settings on every
exit path rather than only on success.
The package lists had drifted badly from what the configs and helpers
actually use. jq alone has thirty-one call sites across the helpers and
the contracts; kitty has a full shipped config and a dock pin; tmux and
btop have shipped themes the colour scheme switches; ddcutil, qrencode
and orca back features added today. None were declared. Neither were
fontconfig, pciutils, libselinux-utils, libnotify, wireplumber, fwupd or
python3-dnf, all of which shipped scripts invoke by name. A fresh
machine following this repository's own instructions would have got a
desktop whose features quietly were not there -- the helpers report "not
installed" rather than crashing, which is good behaviour and completely
silent.
So the lists are corrected and a contract now checks that every external
command Panama's scripts invoke is installed by Panama's packages.
Writing it was instructive about its own blind spots. The first version
reported `then`, `esac` and `done` as missing packages, burying the real
findings. The second passed while jq was undeclared, because the pattern
required three characters and jq is two -- a dependency checker with a
blind spot for short names is worse than none, since it reports PASS.
The third missed ddcutil, which is only ever invoked as `timeout 10
ddcutil` and so never appears statement-initial. It now also reads
`command -v X`, which is how these helpers probe for a tool and
therefore the clearest statement of a dependency there is. Verified it
catches jq, ddcutil and qrencode individually.
Also replaced a fixed 0.3s sleep in the write contract with a bounded
wait. It was failing about one run in three with "a rejected value did
not surface an error" when the error had simply not arrived yet, which
reads as a missing guard rather than a slow one.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Brings in panama-doctor (a 25-check diagnostic with fixture-backed
contracts), a Health service, a System Health page replacing Startup &
Services, and a bar indicator that stays absent until something is
actually degraded. All seven of its contracts pass on the merge.
Three things needed resolving rather than accepting:
The branch predates the debranding, so its user-visible strings still
named the product -- "Panama desktop is healthy", "Restart Panama",
"Panama tools". Rewritten to say the same thing without the name, which
is what the rest of the app now does.
Its Fedora hand-off card was a single button calling openGnomePanel
("network") under a subtitle naming five subjects. Main had already
replaced that with a row per subject, each opening the panel that owns
it, so those rows are ported into HealthPage instead. Printers and
online accounts stay on Network & Devices with the rest of the network
hardware.
That broke its own assertion, which matched the literal
openGnomePanel("network") string. Rewritten rather than reverted: it now
checks the boundary card exists and that every panel named in HealthPage
is one openGnomePanel actually allows, since a name outside the
allow-list opens nothing at all. Verified it catches a plausible-looking
wrong name.
SettingsShell and SettingsSidebar conflicted because both sides added
pages; resolved as the union, keeping its System Health page and live
footer alongside main's Mouse & Touchpad, Privacy & Security, Region &
Language and Online Accounts.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Found by codex's GNOME Tweaks audit and verified against the compositor:
`hyprctl descriptions` publishes input:follow_mouse as
map: [{"separate":3},{"detached":2},{"follow":1},{"disabled":0}].
Panama labelled 0 "Never", 1 "Click to focus", 2 "Sloppy focus". So this
desktop, sitting on the shipped value of 1, has been running
focus-follows-pointer the whole time while Settings called it "Click to
focus" -- and the way to actually GET click-to-focus was to choose
"Never". Value 3 was not offered at all. hypr/input.lua carried the same
wrong claim in a comment.
The shipped VALUE is left alone. Which focus mode this desktop should
use is a behaviour decision rather than a correction, and all four are
now reachable from Settings.
Nothing could have caught this. The compositor accepts 1, reads back 1,
and the write contract passes: the value is valid, it just means
something other than the label. The only authority on what each number
MEANS is the compositor, and it publishes that. So enum-hypr-map-contract
now checks every compositor-backed enum against the published map --
that offered values exist, and that published values are offered, since
a missing one is a capability nobody can reach.
Writing it immediately found two more of the same: variable refresh rate
offered Off and fullscreen-games while the compositor publishes four
(always-on and fullscreen-only were unreachable, and fullscreen-only is
what someone wanting VRR for video rather than games wants), and direct
scanout was missing its always-on value. Both now offer everything, with
a detail line per option rather than a bare word.
Verified the contract catches the original followMouse gap and a value
outside the map.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
The schema is the single source of truth for what a setting IS. It
cannot express what a setting USED to be -- and renaming a key, changing
its units, or splitting one setting into two all leave a stored value
the new schema does not recognise. Unrecognised keys are deliberately
carried through untouched so that rolling back to an older Panama does
not discard a newer version's settings, which means the user's choice
silently stops taking effect with nothing to explain it.
settings.json now carries a schemaVersion, and load() runs every pending
migration before anything reads a value. The list is empty: the point is
that the first breaking schema change becomes a routine edit rather than
an emergency, and Omarchy carries eighty of these.
The behaviours that make it safe to run against a real user's file:
A file with no schemaVersion predates this and is STAMPED, not
migrated -- running the list against it would apply upgrades designed
for schemas it never had.
A file from a NEWER Panama is left completely alone. Downgrading keys
is not something this can do correctly, and unknown keys already
survive, so an older build simply ignores what it does not understand.
A step that throws stops at the last good version. Skipping past it
would lose that conversion forever; failing the whole load would cost
the user every setting.
The list being empty is exactly why this is tested now: the first time
it runs for real will be against somebody's actual settings during an
upgrade, which is a poor moment to find out how it behaves. The harness
supplies fixture steps including one that throws, and the contract pins
all four behaviours above plus the promise that unknown keys survive.
One thing the contract earned its place on: stamping a pre-versioning
file changes it without running any step, so writing only on "migrated"
left the stamp in memory to be redone on every launch. It now writes
whenever the version moves, and explicitly does not write a file from
the future.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
GNOME's Wi-Fi panel has this and it is the most-used thing in it: the
alternative is reading a passphrase out loud. Network & Devices now shows
a scannable code for any saved network whose passphrase this user can
read.
The image contains the network password in machine-readable form, so
most of the care here is about that rather than about QR codes. It is
written under XDG_RUNTIME_DIR -- 0700, on tmpfs, gone at logout --
rather than /tmp, which is shared; the file is 0600; the passphrase is
piped to qrencode on stdin rather than passed as an argument, because
argv is world-readable through /proc for as long as the process runs;
and it is never printed or included in an error message. Generated on
demand, because producing a code for every saved network up front means
writing images of passwords nobody asked to see.
Enterprise networks are listed as not shareable rather than offered and
broken: there is no passphrase to encode, so the code could not work.
Two bugs the contract caught while being written. Semicolons in an SSID
were not escaped -- the sed replacement had one backslash where its four
neighbours have two, so sed dropped it, and an SSID containing a
semicolon would have produced a QR code describing a different network.
And nmcli's trailing newline landed inside the payload; it decoded here,
but a newline in the middle of a WIFI: URI is not something every phone
tolerates, and that failure would present as "the QR code just doesn't
work on my phone".
The contract stubs nmcli and qrencode, because the real ones would write
this machine's actual Wi-Fi password into a fixture directory. It
asserts the escaping, the absence of a newline, the file and directory
modes, that no temporary payload survives, and that the passphrase never
reaches argv.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
The same Power Saver / Balanced / Performance choice GNOME's Power panel
offers, and the daemon behind it was already running here -- it simply
had no control anywhere in Panama. This machine has been sitting on
"performance" with nothing to say so.
Talks to the net.hadess.PowerProfiles interface rather than to a binary.
Fedora 44 implements it with tuned-ppd instead of power-profiles-daemon,
and powerprofilesctl is not installed at all, so anything shelling out
to that command would have found nothing while the service was right
there. Setting a profile needs no privileges: the daemon accepts a
property write from the active session user.
Not a stored preference. The daemon owns the profile, it survives Panama
restarts, and anything else on the system can change it, so a copy in
settings.json would drift -- the same reasoning as monitor brightness.
PerformanceDegraded is surfaced because it is what makes the setting a
lie: a thermally throttled machine reports "performance" while behaving
otherwise, and that is worth saying out loud.
The contract stubs busctl, because the real daemon is a system service
shared with everything else on the machine and a test that flipped the
daily driver to power-saver and then died would leave it there. It pins
the parsing in particular: busctl renders the Profiles property flat, so
profile names and driver names arrive in one stream, and a pattern loose
enough to match both reports the driver as an extra profile. On this
machine the driver is called "tuned", which reads exactly like a
plausible fourth profile -- verified the contract catches that, and
catches an unvalidated name reaching the system service.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
This contract failed intermittently with "a typed batch did not reach
the compositor", reporting Panama's shipped defaults, and passed on
retry. The earlier guard against a lingering harness was not the cause --
no instance was alive.
Adding the writer's own error to the failure message settled it: the
writer reports NO error while the compositor holds defaults. A rejected
write leaves an error behind; a write that succeeded and was then
overwritten does not. Both this contract and the LIVE shell write to the
same compositor, and the running Panama re-applies its own preferences
on any store change -- landing exactly the values that were being
mistaken for "the write never happened".
So the apply is re-issued periodically while waiting, which makes the
test survive being overwritten without weakening what it asserts, and
the failure message now distinguishes the two cases instead of
describing both as a write that never arrived.
The wait is also 10 seconds rather than 4. The write path verifies every
option by reading it back and retries a refused batch, so a loaded
machine legitimately takes longer -- and this runs in a suite alongside
other tests driving the same compositor.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
The keyring is already unlocked at sign-in exactly as GNOME does it --
pam_gnome_keyring is in GDM's stack and the journal confirms it works
("gnome-keyring-daemon started properly and unlocked keyring"). So there
was no configuration bug to fix. What a bare Hyprland session lacks is
anywhere to see when that has stopped being true.
It stops being true rarely and expensively. gnome-keyring-daemon crashed
once on this machine -- an upstream abort in service_method_open_session,
with a core dump -- and D-Bus then activated a replacement. That
replacement never received the login password, so the keyring was locked
in the middle of a session that had unlocked it correctly at login.
Nothing announces this. What you see instead is a mail account that will
not authenticate, a git push that cannot find its key, or an integration
reporting "not configured", none of which mention keyrings. That is the
same root cause as the Home Assistant token failure earlier.
Privacy & Security now shows the state, offers an Unlock action that
raises the standard password dialog, and reports when the daemon holding
your secrets is a D-Bus replacement rather than PAM's -- because a
replacement that is currently unlocked was unlocked by hand and will not
survive a restart. The password never passes through Panama.
The contract stubs the secret service rather than touching the real one:
locking the login keyring breaks every saved password on the machine and
can only be undone by typing the password into a dialog, so it is not
something a test suite may do to a daily driver. Verified it catches a
helper that misreports locked as unlocked, and one that crashes instead
of reporting a missing service.
Worth recording: a locked keyring makes a NON-INTERACTIVE caller appear
to hang. It is not hung -- it is waiting on a dialog nobody is looking
at, which is exactly how the earlier secret-tool investigation lost an
hour.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Reported symptom: Electron applications and a Chromium-based browser,
all set to follow the system, went light when the desktop went light and
never came back. Nothing reported an error, and the portal was serving
the correct value the whole time.
Cause: ColorScheme set gtk-theme to "Adwaita-dark" for dark and
"Adwaita" for light. Neither is installed on Fedora 44 -- only adw-gtk3
and adw-gtk3-dark are. GTK responds to an unknown theme name by falling
back to its built-in default, which is LIGHT. So asking for light worked
by accident, asking for dark silently produced light, and anything that
takes its cue from the GTK theme rather than the portal stayed light no
matter what org.freedesktop.appearance said. Verified: the portal emits
correctly in both directions, so this was never the portal's fault.
Second cause, the mirror of the first: gtk-3.0/settings.ini and
gtk-4.0/settings.ini were pinned to adw-gtk3-dark and prefer-dark=1 and
never regenerated. Under GNOME that file is ignored because
gnome-settings-daemon publishes over XSETTINGS; under Hyprland nothing
does, so for GTK3 it is authoritative -- and it contradicted the scheme
in light mode. They are now generated from a template on every switch,
gitignored as machine state, and seeded by link-dotfiles, the same shape
kitty's current-theme.conf already uses. These directories are symlinked
into the repository, so writing the live file directly would dirty the
working tree on every theme switch.
The failure was silent by construction, so it gets a test rather than a
comment: gtk-theme-contract asserts every theme name Panama sets is
actually installed, and that the generated GTK config agrees with the
scheme in both directions. Verified it catches both original bugs.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
It is the system settings app for this desktop, so it is named the way
one is. The window is "Settings", the titlebar is "Settings", the
wordmark above the search field is gone, the sidebar's last row is
"About", and the status line reads "Desktop is healthy".
Prose followed the same rule. Forty-odd strings explained what "Panama"
does -- "Panama never animates while idle", "Restore Panama defaults",
"Panama looks in ~/Pictures/Wallpapers" -- which is how a product
describes itself, not how a settings panel describes a setting. They now
say what happens. No user-visible "Panama" remains anywhere in the app.
Two consequences worth naming:
The SUPER+I shortcut's description is user-visible, because the
Shortcuts page is generated from it, so that is renamed too. Rebindings
are keyed by shipped chord rather than description, so no existing
override is orphaned by this.
Three contracts matched the window by title and one matched that
shortcut by description; all four are updated. There are no Hyprland
window rules keyed on the title, so nothing about the window's placement
changes.
The desktop entry is now Name=Settings, but the FILE keeps its
panama-settings name, as does the icon: the dock pins applications by
desktop id, and renaming the file would silently unpin it.
dock-pins-contract covers exactly that.
The dated design docs under docs/superpowers keep the old name. They are
a record of what was decided when, and editing them to agree with the
present would make them lie about the past.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
With I2C access granted, the helper still found nothing: every connected
monitor was probed on the wrong bus.
A connector has two. The `ddc` symlink points at the classic I2C line
that carries EDID on HDMI and DVI. DisplayPort carries DDC/CI over the
AUX channel instead, which appears as a child directory of the
connector. Both exist on a DP connector and both resolve, so the wrong
choice looks entirely reasonable and simply finds no monitor: this
machine's DP-2 has ddc -> i2c-5, where ddcutil reports "No monitor
detected", while its AUX child i2c-9 answers VCP 0x10 immediately.
This is the guess the previous commit said was unverified, and it was
wrong in the way that mattered. Enumerating from sysfs is still right --
it gives the connector name Hyprland uses and skips empty connectors --
but it has to prefer the AUX child and fall back to the symlink.
The fixture now mirrors sysfs properly: /sys/class/drm/<connector> is a
SYMLINK to the real device directory, and `find` does not follow the
path it is given. A fixture built from plain directories passes whether
or not the code resolves the symlink first, which is a test that agrees
with itself rather than with the kernel.
Verified on hardware: the Kuycon P20 reports 100%, accepts 70 and
returns to 100, and the media keys move it through codex's OSD path.
Both bus-selection mistakes are now caught by the contract.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
settings-hyprland-write-contract failed in full suite runs and passed on
its own, reporting "a typed batch did not reach the compositor" with
every value at its default.
Both it and settings-commit-reset-contract drive the same harness file,
and Quickshell identifies an instance by its config path -- not by the
environment it was launched with. So when one run's instance has not
fully exited, the other's wait for `ipc show` is satisfied by that
instance's target, and the whole contract then talks to a shell it did
not start.
The two directions fail differently, and the second is the alarming one:
The write contract lands on the isolated instance, whose compositor
write seam is deliberately stubbed. Its writes go nowhere, which is
exactly the symptom above.
The commit/reset contract lands on the non-isolated instance and
drives the DAILY DESKTOP's real compositor while believing it is
isolated.
Both now refuse to start while another instance of that harness is
alive, and say which hazard they are avoiding rather than failing on an
assertion much later.
One trap worth naming, since it bit me writing this: `rg -c` prints
nothing at all when there are no matches, so an unguarded command
substitution yields "" and not "0" -- the first version of the guard
fired on a perfectly clean machine.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
GNOME's Search panel configures which applications provide results in
gnome-shell's overview and which folders are indexed. gnome-shell does
not run here, so reimplementing those switches would store preferences
that change nothing. Under Panama searching is the launcher's job and
Vicinae carries its own preferences, so the Applications page says where
search lives and how to rebind the keys that open it, rather than
offering settings that would be inert or duplicated.
The nav contract is the more useful half. Adding a settings page means
editing four files, and missing any one of them fails quietly in a
different way: no sidebar row, a row that silently shows Home, a deep
link that redirects to Home, or -- worst -- a missing qmldir entry,
which makes the page "not a type" and takes the entire settings window
down with it. Nothing at runtime cross-checks the four. Having just
added four pages by hand, this checks them statically, and also fails on
a page file that exists but is unreachable.
Verified it catches a missing qmldir registration and a missing
allow-list entry.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
brightnessctl drives the kernel backlight class, which laptop panels
have and this desktop does not -- it reports only keyboard and NIC LEDs.
So BrightnessControl removed itself and there was no way to dim the
screen from Panama at all. DDC/CI is the channel the buttons on a
monitor's bezel drive, and it is the only brightness an external display
has. Both sources now render a row each, so a machine gets whichever it
actually has, or none.
Displays are enumerated from sysfs rather than `ddcutil detect`. The
kernel publishes the connector-to-bus mapping as
/sys/class/drm/<card>-<connector>/ddc along with whether anything is
plugged in, which beats parsing detect's undocumented brief output,
yields the connector name spelled exactly as Hyprland spells it, and
probes only connectors with a monitor attached -- one bus on this
machine rather than fourteen, where each empty bus costs a timeout.
No model name is read: Hyprland already knows what every output is
called, so the UI joins on the connector instead of keeping a second
source of truth that could disagree with the Displays page.
Writes are debounced, serial, and read back. Serial because DDC/CI has
no arbitration and two ddcutil processes on one bus interleave their
exchanges and both return garbage. Read back because a write is not a
promise: panels clamp to their own range, ignore values while waking
from standby, and drop writes that arrive too fast. Without the read the
slider would show what Panama asked for rather than what the monitor
did, which is the same class of lie as trusting `hyprctl keyword`.
Brightness is deliberately not a stored preference. The monitor
remembers it and the bezel buttons change it behind Panama's back, so
persisting it would mean restoring a value the panel had moved past.
The contract runs against fixtures with ddcutil stubbed and both sysfs
roots redirected, so it never touches a real monitor. Its fixture
reports a maximum of 200 rather than 100 on purpose -- at 100 the
scaling arithmetic is the identity and a helper that ignored the
reported maximum would pass everything. Verified it catches that, plus a
dropped connection-status filter and an unstripped connector prefix.
Not yet confirmed against hardware: this machine cannot open any I2C bus
yet. ddcutil's udev rule grants that through uaccess but only to devices
created after it was installed, so it needs one udevadm trigger. The
helper detects exactly that case and returns the command as its error
rather than reporting "no displays".
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Gabriel Brown