https://bugzilla.kernel.org/show_bug.cgi?id=202799
Bug ID: 202799 Summary: amd/dc: right monitor sometimes never comes back up on dual-display setup after locking session Product: Drivers Version: 2.5 Kernel Version: 5.0 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: libcg@protonmail.com Regression: No
Created attachment 281547 --> https://bugzilla.kernel.org/attachment.cgi?id=281547&action=edit xrandr --props output
- linux 5.0 (4.20 also had the same issue) - xf86-video-amdgpu 18.1.0 - GNOME 3.30
Left screen is a Dell U2412M (1920x1200), right screen is a Dell P2715Q (4K monitor set at 2560x1440, primary). GPU is RX 580.
Steps to reproduce: - Lock session, screens turn off - After a while, press a key to turn the screens back on again - When the left screen lights up first, the system only displays an image on the left screen. The right screen lights up afterwards but goes back to sleep because it's getting no signal, although xrandr still recognizes it. I need to manually turn off the right screen and back on again to get it to reconfigure.
When using `amdgpu.dc=0`, this issue disappears.