dom0: prefer 1920x1200 on StarFighter 4K panels - #222
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August 19, 2026 20:08
Add a dom0 systemd oneshot that runs before the display manager and writes an Xorg monitor snippet for Star Labs StarFighter systems whose eDP connector exposes a native 3840x2400 mode. The kernel-side preferred-mode approach can only mark an already probed DRM mode as preferred, but the affected system exposes the lower modes in Xorg instead. Apply the default at the Xorg layer so the panel starts at 1920x1200 without removing the native mode from the user's choices.
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #222 +/- ##
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- Coverage 71.38% 71.36% -0.03%
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Files 12 12
Lines 1384 1383 -1
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- Hits 988 987 -1
Misses 396 396 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Summary
Add a dom0 oneshot service that runs before the display manager and writes an Xorg monitor snippet for Star Labs StarFighter systems whose eDP panel exposes a native 3840x2400 mode. The generated config sets Xorg's preferred mode to 1920x1200 while leaving the native mode available to users.
Rationale
This is intended to replace the kernel-side draft in QubesOS/qubes-linux-kernel#1344. The affected system exposed only the native 3840x2400 mode through DRM, while Xorg listed the lower modes, so setting the default at the Xorg layer should match where the selectable mode actually exists.
Runtime testing
Not runtime-tested on affected Qubes hardware yet; opening as a draft for review of the approach and packaging location.