On 14.09.19 16:13, Ricardo Band wrote:
Ahoi,
I use Arch on a Thinkpad T480 with the Lenovo Thunderbold 3 dock. I've attached 2 1440p monitors to it and I was using them for a while now. For a few days or so I can't get them to work anymore. Usually I disable my Notebooks internal screen and enable the 2 1440p displays like this:
``` xrandr --output DP1-1 --mode 2560x1440 --refresh 144 xrandr --output eDP --off xrandr --output DP1-2 --mode 2560x1440 --refresh 144 --right-of DP1-1 ```
This used to work quite nicely. No idea if the refresh rate actually worked. I have no way to test that but the resolution sure did.
Now when I do this I get this error:
``` xrandr: Configure crtc 0 failed ```
I can only drive both displays at 1920x1080. When I increase the resolution to 2560x1440 I get this error and the higher resolution can't be set.
I don't know why this doesn't work anymore. Could it be a driver issue? I've got a nvidia GPU with the proprietary driver and the integrated intel with the open source driver and it wouldn't be the first time intel or nvidia fucked their drivers up.
Hi Ricardo, I know this error message very well. For me, giving "--crtc" values to xrandr works perfectly for 3 years now: xrandr --output eDP1 --crtc 0 --mode 1920x1080 --output DP1 --crtc 1 --primary --mode 2560x1440 --pos 1920x0 --output DP2 --crtc 2 --mode 2560x1440 --pos 4480x0 You can check which virtual crtcs your GPU has with xrandr --verbose, but usually it's 0, 1 and 2 like above. I only have an integrated Intel GPU, but the error message sounds very familiar. Best, Tasnad