Hi, I’m on a Dell-G16-7630 with Ubuntu 22.04 on top and linux kernel 6.8.0-48 and a NVIDIA GeForce RTX 4060.
Unfortunately, I’m not able to detect the HDMI signal of my second monitor using any of the recommended nvidia drivers. I tried 535, 545, and 550.
I also tried on other linux kernels like 5.15 and 5.19, but nothing is working.
What should I do?
I have the same problem with 1080Ti in external thunderbolt enclosure, ubuntu 22.04 kernel 6.8.
I had HDMI working for a brief period of time just after 550 driver installation and before the second reboot - xrandr could identify two HDMI outputs, but then the second monitor just disappeared. Oddly enough, recovering the OS from a snapshot created when everything worked does not help - no second display. In the meantime, CUDA apps work fine, nvidia-smi works as expected, but I cannot convince the card to produce video output of its own.
Other observations
[1] the OS detects the second display when NO nvidia driver is present in the system, and it also detects the second display with nvidia-driver-470, but in both cases the performance is bad enough to make the system effectively unusable.
[2] ‘prime-select nvidia’ with 550 makes xorg fail to start and dump the core with stack trace ending in stdlib
After an uncountable number of unsuccessful attempts to make my eGPU communicate over its video ports (DP, HDMI) I finally solved the problem by adding one single line to file /usr/share/X11/xorg.conf.d/10-nvidia.conf:
…
Option “AllowExternalGpus” “true”
…
Then I just restarted lightdm and it worked.