Thanks. Looks like this is also a kernel bug...
** Summary changed:
- resolution not listed in xrandr from ASUS ROG PG278QR via HDMI
+ [modeset][i915] Native resolution (EDID detailed mode) of 2560x1440 not
listed, defaults to 1920x1080 instead
** Also affects: linux (Ubuntu)
Importance:
output from: grep . /sys/class/drm/*/modes > modes.txt
** Attachment added: "modes.txt"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1901470/+attachment/5428462/+files/modes.txt
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Yep, the detailed mode 2560x1440 is in the EDID returned by the monitor:
Standard Timings: none
Detailed mode: Clock 241.500 MHz, 598 mm x 336 mm
2560 2608 2640 2720 ( 48 32 80)
1440 1443 1448 1481 ( 3 5 33)
+hsync -vsync
VertFreq:
I would like to check to see if the problem is occurring in the kernel
and not just in Xorg. Please run:
grep . /sys/class/drm/*/modes > modes.txt
and then attach the resulting text file here.
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apport information
** Tags added: apport-collected ubuntu
** Description changed:
The PG278QR monitor supports 2560x1440. After installing Ubuntu 20.4,
the max resolution presented in the Settings app is 1920x1080, and this
resolution is the one that it uses. Switching between the
Thank you for taking the time to report this bug and helping to make
Ubuntu better. Please execute the following command only once, as it
will automatically gather debugging information, in a terminal:
apport-collect 1901470
When reporting bugs in the future please use apport by using 'ubuntu-
** Package changed: ubuntu => xorg (Ubuntu)
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https://bugs.launchpad.net/bugs/1901470
Title:
resolution not listed in xrandr from ASUS ROG PG278QR via HDMI
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