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My second monitor (Lenovo D32Q-20, a relatively simple DisplayPort
1.2-era QHD monitor 2560×1440 @ 75 Hz, FreeSync) stopped being detected
after a system update that upgraded the kernel from 7.0.0-22 to
7.0.0-27.
The monitor is directly connected to Radeon Pro W7900 via DisplayPort
cable. I have tried substituting the DP cable and the DP port to no
avail. The monitor works with another PC. I tried troubleshooting with
ChatGPT—it suspects a regression in ("-27") AMD Display Core (DC) driver
or DisplayPort initialization path in kernel, and suggests booting the
"-22" kernel.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: xorg (not installed)
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul 14 12:58:20 2026
InstallationDate: Installed on 2026-05-20 (55 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: amd64 apport-bug resolute wayland-session
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Kernel 7.0.0-27 update stopped detecting my Lenovo D32Q-20 monitor
https://bugs.launchpad.net/bugs/2160594
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Bugs, which is subscribed to gnome-shell in Ubuntu.
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