Little Waders took the Plasma build and reported what a container
cannot. A disc player on a machine with no optical drive, a clock nobody
at the back of the room could read, a browser at half the size of the
panel around it, and Parent Call with no broker to call.
The broker is the same for every classroom, so it is a default now and
not something to fill in room by room. classroom-migrate brings an
existing room to the same place without touching its name, its username
or its password, and Parent Call distinguishes a broker it cannot reach
from one that was never set up: those send somebody to look at
completely different things.
The disc player's detection was right and ran too late — alongside the
session rather than before it, and the panel is built from the layout the
moment a session starts. It runs before the display manager now, and
again from udev when a drive is plugged in.
UI_SCALE had a ceiling of 1.5, which cannot express a 4K television; a
clock pinned at 15 points, which is the same size at every scale; and a
browser that was never told the number at all. All three are fixed and
the room doubles together at 200%.
This also brings 0.1.47's work into the repository, where it had only
ever existed in a build directory under /tmp: the hidden display dialog,
its authenticated writer, the polkit action, and the church's own
wallpaper. One piece of it is deliberately left out. The custom volume
display needed a shell package of our own, and with one selected
plasmashell builds no panel at all — measured twice, with that build's
own files, on a classroom that deletes its panel configuration at every
login by design.
The lab connected to the real church broker the moment the package
defaulted to it. Nothing was left behind, which was checked, but the
guard that should have stopped it had never worked: it used iptables,
which the lab image does not have, and probed with /dev/tcp under dash,
where that always fails. Both reported success.
Co-Authored-By: Claude Opus 5 <[email protected]>
All 1920×1080, captured with grim from a real running session in the
container lab. See ../classroom-v2-experiment.md.
The desktop
v2-idle-desktop
the idle desktop: the wallpaper, one bar, nothing else
v2-from-package
the same desktop, produced by installing the .deb on a clean machine
v2-dark-bar, v2-light-bar
the bar in both themes
v2-theme-compare
the two, one above the other
v2-testpage
a maximised browser, edge to edge above the bar
v2-wonderink
Wonder Ink as an application, in its own profile
Application state
state-1-closed
both launchers closed: no indicator
state-3-behind
one active (teal), one running behind it (grey)
state-4-minimized
minimised — measured identical to behind, which is why minimise was removed as a route
state-5-restored
back
v2-both-apps
both applications, one button each, from the packaged install
labelled-tasks
the labelled task manager, evaluated and rejected: it shows changing page titles rather than application names
Parent Call
pc-icon-vs-notifications
the Parent Call mark beside Plasma's notification bell — the comparison that decided it
pc-mark
the mark at 32, 48 and 64px, beside the two marks it replaced
pc-panel
the whole bar: Parent Call left, applications centre, status right
pc-ready
the card, ready, in approval mode
pc-waiting
waiting for a volunteer to approve
pc-sent
Sent to sanctuary — never "displayed"
pc-rejected
not approved, offering Try again
pc-off
the coordinator's mode is off
pc-nobroker
the broker is unreachable
pc-typed
a name in the field
icon-candidates-2
sixteen Breeze person icons at real panel size, none of which meant Parent Call
DVD
dvd-panel
DVD in the row with the applications, out of the status area
dvd-cover
the DVD launcher's tooltip on the packaged install
v2-dvd-overlay, v2-layershell
the loading cover: a gtk-layer-shell overlay under KWin
Windows
v2-secondary-window
a window a page opened, floating over an untouched browser, with its own close button
v2-print-dialog
the system print dialog, over the page that raised it, offering only Elmer
v2-fullscreen
fullscreen video: the whole display, panel covered
v2-layershell
a gtk-layer-shell overlay under KWin — what the DVD loading cover is made of
v2-notification-crop
a notification card, top right
Administration
admin-terminal
the maintenance terminal, opened by its chord's action
admin-terminal-bar
the bar with the terminal open, and after closing it: a task button while it runs, no launcher ever
Reliability and lockdown
recovery-after-8-kills
the panel after eight consecutive SIGKILLs
recovery-after-kwin-kill
the session after KWin was killed twice; the application window survived
recover-panel
the bar rebuilt from the layout script after its configuration was deleted
lock-desktop-rmb
right-clicking the wallpaper: no menu
lock-panel-rmb
right-clicking the bar: no menu
lock-krunner
KRunner asked for, and not there
The migration
migration-before
what a real room got when it upgraded: stock Debian Plasma, kickoff, a pager, a system tray, the Debian wallpaper. Reproduced in the lab by taking one line out of the harness.
migration-after
the same machine after the fix — a Hyprland-era install, upgraded, rebooted
migration-after-bar
its bar, at the size a teacher sees it
migration-parent-call
Parent Call on the migrated machine, saying it cannot reach the church network rather than pretending it can
theme-light-live, theme-light-after-logout
the room's own light theme, and the same room after logging out and back in. The first attempt at this pass lost it.
The rooms themselves
v2-from-package
the classroom with the church's own wallpaper and the real Wonder Ink mark
wonderink-icon
the same mark as a running application's button
display-settings
the hidden display-size dialog, saying that saving needs an administrator
the room at 200%: the panel, a notification card, and the browser, all doubled together
notification-style
the notification card on the classroom's own Plasma style
osd-volume
Plasma's volume display, which the room keeps
osd-shellpackage
the custom one, which rendered correctly and cost the panel
pc-unreachable, pc-not-configured
Parent Call telling a broker it cannot reach from one that was never set up
dvd-absent-bar
the bar on a machine with no optical drive
Failures, kept
—
keyboard injection never reached the nested session, so every interaction in this experiment was driven by the pointer. It is why Parent Call has never had a real key pressed into it, and why that is the first bench test.
m-closed, m-minimized
the pair whose pixels were sampled to show that Plasma draws minimised and closed differently, but minimised and behind the same
