I'm running 20.04 LTS (with latest HWE kernel 5.8.0-36-generic). Dual monitor UHD via DP and hdmi. NVIDIA GeForce GTX 1660 SUPER with latest driver 460.
After upgrading my video card from Nvidia GT 1030 to Nvidia GTX 1650 SUPER the second external monitor (hdmi) is not waking up any more. I can tell that the display is still being recognised by the system (e.g. shows up on Display Settings and I can still move the mouse into the screen area), but it's not waking up.
- Power cycle does not help
- Unplugging does not help (-> https://askubuntu.com/a/1241843/41697)
- Suggested
xrandrcommands from this answer don't help (-> https://askubuntu.com/a/1131579/41697)
I've found a workaround that at least saves me from rebooting every time: Manually switching on the screen before ending suspension makes it come up okay.
This issue did not occur with the old graphics card (driver version was 450 back then).
Nothing stands out in the Nvidia forum (-> https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148).
How do I even start debugging this?
❯ nvidia-smi
Sun Jan 10 08:29:36 2021
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 460.32.03 Driver Version: 460.32.03 CUDA Version: 11.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 GeForce GTX 165... Off | 00000000:01:00.0 On | N/A |
| 0% 60C P0 22W / 100W | 744MiB / 3910MiB | 0% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
Update
This might be the root case of the problem: https://forums.developer.nvidia.com/t/nvidia-455-driver-dpms-doesnt-turn-monitor-back-on/165594
0 Answers