It looks to me like the kernel is failing to set up the laptop panel
correctly. These log messages occur right before the login screen, which
is also about when the system will be switching from BIOS graphics
(simpledrm) to the amdgpu driver:
Mai 12 20:30:18 kirchner-Vivobook-ASUSLaptop-TN3402QA-TN3402QA kernel: amdgpu
0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1122: core_link_write_dpcd
(DP_DOWNSPREAD_CTRL) failed
Mai 12 20:30:18 kirchner-Vivobook-ASUSLaptop-TN3402QA-TN3402QA kernel: amdgpu
0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1127: core_link_write_dpcd
(DP_LANE_COUNT_SET) failed
Mai 12 20:30:18 kirchner-Vivobook-ASUSLaptop-TN3402QA-TN3402QA kernel: amdgpu
0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1144: core_link_write_dpcd
(DP_LINK_BW_SET) failed
Mai 12 20:30:18 kirchner-Vivobook-ASUSLaptop-TN3402QA-TN3402QA kernel: amdgpu
0000:03:00.0: [drm] *ERROR* dpcd_set_link_settings:1149: core_link_write_dpcd
(DP_LINK_RATE_SET) failed
** Summary changed:
- Wayland black screen
+ [amdgpu] Asus Vivobook TN3402QA screen turns blank on startup
** Package changed: mutter (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Tags added: amdgpu regression-release
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https://bugs.launchpad.net/bugs/2150832
Title:
[amdgpu] Asus Vivobook TN3402QA screen turns blank on startup
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