> UPDATE: Source investigation identifies likely root cause — incorrect
DSC (Display Stream Compression) bandwidth calculation in the AMDGPU
driver's MST/USB-C code path. The current linux-hwe-6.17 kernel uses the
wrong value for DSC pic_width, causing DC_FAIL_DSC_VALIDATE during GDM
login screen initialisation. Fix confirmed present in linux-7.0.0
(Ubuntu 26.04 LTS).
Users are migrated from HWE 6.17 to HWE 7.0. So if it's fixed there
then nothing else to be done.
** Changed in: linux-hwe-6.17 (Ubuntu)
Status: Triaged => Won't Fix
** Changed in: linux-hwe-6.17 (Ubuntu Noble)
Status: New => Won't Fix
** Changed in: linux-hwe-6.17 (Ubuntu Resolute)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2150386
Title:
[amdgpu] Green lines on GDM login screen over USB-C DP MST — DSC
bandwidth validation failure(?)
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