Created attachment 92350 [details] Xorg.0.log I have 1920x1200 60 Hz monitor connected via DP-HDMI cable to Lenovo T520 laptop. Actual results: I have configured 1920x1200 resolution (see xrandr). Monitor's menu shows 1920x1080 input resolution. Screen covers 1920x1080 physical area on monitor. Fonts are blurry, seems like virtual screen image 1920x1200 reduced to 1920x1080 (When I configure 1920x1080 mode, fonts are OK). nVidia binary blob can set 1920x1200 resolution properly on same HW configuration. Informations from EDID are correct, see Xorg.0.log. Expected results: Physical screen resolution on monitor should be 1920x1200. I think there is some hardcoded limitation in DRM or nouveau driver. Because hardware is perfectly capable of running 1920x1200 via HDMI. 01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [Quadro NVS 4200M] (rev a1) xrandr Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192 LVDS-1 connected (normal left inverted right x axis y axis) 1600x900 60.0 + 50.0 1152x864 60.0 1024x768 59.9 800x600 59.9 640x480 59.4 720x400 59.6 640x400 60.0 640x350 59.8 VGA-1 disconnected (normal left inverted right x axis y axis) DP-1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 291mm 1920x1080 60.0 + 59.9 1920x1200 60.0* 1920x1080i 60.1 50.0 60.0 1600x1200 60.0 1680x1050 59.9 1280x1024 75.0 60.0 1440x900 59.9 1152x864 75.0 1280x720 60.0 50.0 59.9 1440x576i 50.1 1024x768 75.1 70.1 60.0 1440x480i 60.1 60.1 832x624 74.6 800x600 72.2 75.0 60.3 720x576 50.0 720x480 60.0 59.9 640x480 75.0 72.8 66.7 60.0 59.9 720x400 70.1 DP-2 disconnected (normal left inverted right x axis y axis) DP-3 disconnected (normal left inverted right x axis y axis)
Created attachment 92351 [details] dmesg
Created attachment 92352 [details] dmesg video=DP-1:1920x1200 I cannot workaround it by adding this to kernel cmdline: video=DP-1:1920x1200 nor using xorg.conf "Modeline" and "PreferedMode" options. At least DRM allocates "1920x1200" instead of "1920x1080", but I don't any other change from actual results.
Can you try setting the "scaling mode" to None with xrandr?
I run: xrandr --output DP-1 --set "scaling mode" "None" This workarounds the problem, thanks. It's still scaled wrongly in VT and I have to run it every time I boot. 1) Can I add this workaround in kernel cmd line? 2) Could you fix it properly in nouveau driver to make it scaling right by default?
(In reply to comment #4) > I run: xrandr --output DP-1 --set "scaling mode" "None" > > This workarounds the problem, thanks. > > It's still scaled wrongly in VT and I have to run it every time I boot. > > 1) Can I add this workaround in kernel cmd line? Well, I think xrandr just manipulates the KMS property. You can do this yourself as well. The only tool I know of that lets you do this is the "modetest" tool that's in the tests dir of drm, but perhaps there are others. Perhaps there's also a way to set that as a default via video= or something like that, but I'm not aware of anything specific. > > 2) Could you fix it properly in nouveau driver to make it scaling right by > default? I believe that the current policy was deemed to be the correct one. I don't really know the details of the various situations though. I believe the implication of the EDID is that it's really a natively 1920x1080 monitor, so we should scale for any other resolution. However, again, I'm a little weak on the specifics. You might try asking in #nouveau or #xorg on freenode.
I believe semi-recent kernels have updated the logic for when to enable scaling mode automatically. It's basically restricted to LVDS and eDP. See commit 0ea5fe8a83c, in kernel 4.0+.
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