i915: Asus Zenbook Duo (2024 / UX8406MA) - second screen broken since 6.9 kernel line
Description:
Asus Zenbook Duo (2024 / UX8406MA) is a dual screen notebook based on Intel Meteor Lake architecture. Starting with kernel 6.9 line, second screen is totally unusable. This is a known issue and there is a super simple 4 line fix for it, but not yet merged to the upstream i915 tree (not even fully reviewed).
I'm afraid that delivering this fix to mainline kernel will take months. Please consider cherry picking this fix to the Arch set of patches.
There are the details with offending commit bisected: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11488
And a fix is posted by dnyaneshwar.bhadane@intel.com here: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11488#note_2503805
This brings the second screen back to life
Additional info:
- package version(s): linux 6.9+
- config and/or log files: N/A
- link to upstream bug report, if any: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11488
Steps to reproduce:
- Boot laptop
- Second screen is dead