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
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