I have a new system with a new installation of Debian Bullseye. The graphics card is an RX580 with one monitor connected to the HDMI port and another monitor of a different type connected to the DVI port.
The symptoms are:
- Both monitors turn on and off at the same time, but at random times.
- At that time dmesg says:
[50058.208354] [drm] PCIE GART of 256M enabled (table at 0x000000F400000000). [50058.305808] [drm] UVD and UVD ENC initialized successfully. [50058.456790] [drm] VCE initialized successfully. [50066.534370] amdgpu 0000:07:00.0: amdgpu: 00000000f84d05e5 unpin not necessary [50066.534386] amdgpu 0000:07:00.0: amdgpu: 00000000f84d05e5 unpin not necessary
- Pressing CTRL+ALT+Fn to switch virtual terminals turns the monitor on. Pressing other keys do not.
The graphics driver is amdgpu.
I am using the kernel parameter "amdgpu.dc=0" because it made dual monitors work.
I first noticed the problem after enabling the front audio ports with pavucontrol-qt. I'm not sure if this issue could be related to HDMI audio, or if it's a coincidence because the symptoms are random. Occasionally I have seen unexplained audio popup messages in KDE, but this does not happen often enough for me to tell if it is related.
I'm pretty sure it's not a screensaver or energy management.
How do I get my monitors to stay on?
