Please also run this command:
grep . /sys/class/drm/*/modes > kernel-modes.txt
and attach the resulting text file here.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1890418
Title:
i915 does not expose vendor-specific extended HDMI timings/modes
Status in linux package in Ubuntu:
Incomplete
Status in xorg-server package in Ubuntu:
Incomplete
Bug description:
I have a Toshiba radius 11 laptop which has a 4 k native screen. I
have connected an Asus PB287Q 28" external monitor
(https://www.asus.com/us/Commercial-Monitors/PB287Q/specifications/)
over HDMI which displays the full 4K resolution when running under
windows10 but will only reach a maximum resolution of 1920x1080 under
ubuntu 20.04, same hardware just dual booting. Under Monitor
Preferences this monitor is detected as an "Ancor Communications inc
28" and the monitor preferences provides a number of resolution steps
up to 1920. If I issue "xrandr --addmode HDMI-1 3840x2160" this
resolution is added to the monitor preferences pick list but
attempting to apply it results in "the selected configuration for
displays could not ..." message
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