On Wed, Jan 7, 2026 at 5:42 PM alliancetrooper <[email protected]> wrote: > > Hello. > > I am reporting a regression in the kernel. an external HDMI monitor fails to > wake up from a low-power state. > The issue occurs both in the VT console (using consoleblank parameter) and in > the X.Org graphical session (using xset dpms force off). > The internal laptop display resumes correctly. This problem was not present > in Linux kernel 6.17. It started occurring after updating to kernel 6.18.0.
Please file a ticket at: https://gitlab.freedesktop.org/drm/amd/-/issues Can you bisect? Thanks, Alex > My Kernel: 6.18.3, built from vanilla sources in Gentoo. Display controller: > Advanced Micro Devices, Inc. [AMD/ATI] Strix [Radeon 880M / 890M] (rev c4). > > No messages in dmesg regarding this. > > Steps to Reproduce: > 1. Connect an external monitor via HDMI. > 2. Boot with the kernel parameter consoleblank=30. > 3. Wait 30 seconds for the screen to blank and some time (no more than 5 > mins) additionally. > 4. Try to wake the display by pressing a key. The external monitor remains > off, while the internal laptop display turns on. > 5. Also reproducible in X11/Xorg session using xset dpms force off. It is > also needed to spent some time in off state. > > Thank you.
