| Summary: | No 1080p or 720p resolutions on 4k display | ||
|---|---|---|---|
| Product: | [Plasma] KScreen | Reporter: | bug2017 |
| Component: | common | Assignee: | Sebastian Kügler <sebas> |
| Status: | RESOLVED UPSTREAM | ||
| Severity: | normal | ||
| Priority: | NOR | ||
| Version: | git | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Attachments: | edid.bin for Sharp LQ156D1JW04 | ||
Thanks for the report! Could you please run xrandr -q (assuming you're running X11, not Wayland) on this system and post the output here? This helps us to identify where the problem may lie. The output on plasma5: Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 8192 x 8192 eDP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 346mm x 194mm 3840x2160 60.00*+ 2048x1536 60.00 1920x1440 60.00 1856x1392 60.01 1792x1344 60.01 1600x1200 60.00 1400x1050 59.98 1280x1024 60.02 1280x960 60.00 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 800x600 60.00 60.32 56.25 700x525 59.98 640x512 60.02 640x480 60.00 59.94 512x384 60.00 400x300 60.32 56.34 320x240 60.05 DP-1 disconnected (normal left inverted right x axis y axis) HDMI-1 disconnected (normal left inverted right x axis y axis) HDMI-2 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) HDMI-3 disconnected (normal left inverted right x axis y axis) The output from kde4 (old snapshot): Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767 eDP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 350mm x 190mm 3840x2160 60.00*+ 3200x1800 60.00 2880x1620 60.00 2560x1440 60.00 2048x1536 60.00 1920x1440 60.00 1856x1392 60.01 1792x1344 60.01 2048x1152 60.00 1920x1080 60.00 1600x1200 60.00 1400x1050 59.98 1600x900 60.00 1280x1024 60.02 1280x960 60.00 1368x768 60.00 1280x720 60.00 1024x768 60.00 1024x576 60.00 960x540 60.00 800x600 60.32 56.25 864x486 60.00 640x480 59.94 720x405 60.00 640x360 60.00 DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) HDMI3 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) Thanks for the quick reply! I suppose the old snapshot also contains a different Xorg version or different (version) of the graphics driver? In any case, your Xorg doesn't provide these modes anymore. The reasons for this can be manifold, but you can probably get them back by adding a modeline. Plasma just reads whatever information xrandr provides, so as soon as you get back the missing modes into xrandr, it'll also work with Plasma. I'll mark this as an upstream problem, since we can't fix this in Plasma or KScreen, not because it's not an actual issue, but because it needs to be handled outside of Plasma's codebase. |
Created attachment 109730 [details] edid.bin for Sharp LQ156D1JW04 On KDE4 It was possible to switch to 1080p or 720p, both resolutions important for games, because the iGPU can't handle 4k with sufficient frame rate. On Plasma5 the mode list is filled with 4:3 resulutions like 1920x1440. Selecting a resulition like 1080p in a game like sauerbraten results in a big black border (left and right black from the 4:3 mode, top and bottom to convert 4:3 back to 16:9) The edid file contains only the native 4k resolutions.