https://bugzilla.kernel.org/show_bug.cgi?id=201795
--- Comment #22 from [email protected] --- I investigated further and the culprit seems to be that kernel =4.14 ignores what xrandr *wrongly* detects and sets the connected TV correctly to its native 3840x2160@60hz without black bars. Xrandr detects only 30hz in both 4k resolutions on all kernels. Kernel 4.14 still manages somehow to give me 3840x2160@60hz without black bars. So could this be a xrandr-bug? Kernel >4.14 seems to respect xrandr and sets: 4096x2160@30hz without black bars - maybe my HDMI2.0-to-DP adapter is reporting this setting. I also can get 3840x2160@30hz without black bars with your xrandr workaround, but not 60hz. In more detail: kernel =4.14 ------------- xrandr --props reports that scale-mode is "None". But still no black bars, because the *native* resolution of the TV is 3840x2160 (listed in the panel specs here: https://www.lg.com/us/support-product/lg-OLED65B7P) So if I change to 4096er resolution the desktop is bigger than the screen. Also I have 60hz on both displays, while xrandr *wrongly* reports only 30hz available on the TV. The difference between 60 and 30hz is very visible when moving the mouse and e.g. supertuxkart confirms 60hz in the FPS-overlay. kernel >4.14 -------------- The TV sets only 30hz, on 4096 and 3840 res. When I force a 60hz-modeline via xorg.conf.d like described here https://wiki.archlinux.org/index.php/xrandr#Adding_undetected_resolutions I get no signal or a switch back to 30hz, when cloning in the GUI. Then the 3840-black-bar workaround only works if I create this file: cat /etc/xdg/autostart/Scaling.desktop [Desktop Entry] Type=Application Name=Scaling Exec=xrandr --output DisplayPort-0 --set "scaling mode" "Full" Putting it in xorg.conf had no effect. This is what my xorg.conf now looks like. Note that the VRR Option works as expected, so its not as if the file is completely ignored: cat /etc/X11/xorg.conf.d/10-monitor.conf Section "Monitor" Identifier "DisplayPort-0" Option "scaling mode" "Full" Option "PreferredMode" "3840x2160" EndSection Section "Screen" Identifier "Screen0" Device "AMD" EndSection Section "Device" Identifier "AMD" Driver "amdgpu" Option "DRI" "3" Option "TearFree" "true" Option "VariableRefresh" "true" EndSection -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
