Jan Michael Greiner wrote: > Dear all, > > My laptop: Lenovo E520 > Graphics: Intel HD Graphics 3000 (kernel module i915) > > External display AOC U2879VF, 28 inch, connected by HDMI cable > > With Debian Stretch (9.8) I had the display running with 3840x2160 resolution > at 24Hz reduced blank. > > > I did this with something like: > > export modename="3840x2160_24.00_rb" > xrandr --newmode $modename 209.75 3840 3888 3920 4000 2160 2163 2168 2185 > +HSync -Vsync > xrandr --addmode HDMI-1 $modename > xrandr --output HDMI-1 --mode $modename > xrandr --output HDMI-1 --primary > xrandr --output LVDS-1 --off # switch laptop display off > > After upgrade to Buster (Debian 10) > > This does not work any more: > xxx@yyy:~$ xrandr --verbose > Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 > XWAYLAND1 connected 1920x1080+0+0 (0x25) normal (normal left inverted right x > axis y axis) 620mm x 340mm > Identifier: 0x23 > Timestamp: 42126 > Subpixel: unknown > Gamma: 1.0:1.0:1.0 > Brightness: 0.0 > Clones: > CRTC: 0 > CRTCs: 0 > Transform: 1.000000 0.000000 0.000000 > 0.000000 1.000000 0.000000 > 0.000000 0.000000 1.000000 > filter: > non-desktop: 0 > supported: 0, 1 > 1920x1080 (0x25) 173.000MHz -HSync +VSync *current +preferred > h: width 1920 start 2048 end 2248 total 2576 skew 0 clock > 67.16KHz > v: height 1080 start 1083 end 1088 total 1120 clock 59.96Hz > xxx@yyy:~$ export modename="3840x2160_24.00_rb" > xxx@yyy:~$ xrandr --newmode $modename 209.75 3840 3888 3920 4000 2160 2163 > 2168 2185 +HSync -Vsync > xxx@yyy:~$ xrandr --addmode XWAYLAND1 $modename > xxx@yyy:~$ xrandr --output XWAYLAND1 --mode $modename > xrandr: Configure crtc 0 failed > xxx@yyy:~$ xrandr --output XWAYLAND1 --mode $modename --verbose > screen 0: 3840x2160 1237x696 mm 78.83dpi > crtc 0: 3840x2160_24.00_rb 24.00 +0+0 "XWAYLAND1" > xrandr: Configure crtc 0 failed > crtc 0: disable > screen 0: revert > crtc 0: revert > > > After searching the internet, and trying to understand the relationship > between Wayland - graphics driver - graphics configuration - X etc. (which I > was not successful at), I hope to get help here on this mailing list.
Your problem is likely to be Wayland, which is trying to replace X. Switching back will probably solve your issue. -dsr-
