@Daniel: That current mode is from the xrandr.txt when the working
2560x1440 resolution is set. Lionel and I got the 23.98 Hz figure from
monitors.xml that I generated after the 1920x1080 change is applied and
the monitor has no signal. With the monitor receiving no signal in
1920x1080, the verbose xrandr shows:
1920x1080 (0xc6) 74.176MHz +HSync +VSync *current
h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 26.97KHz
v: height 1080 start 1084 end 1089 total 1125 clock 23.98Hz
So g-c-c is definitely choosing the lowest refresh rate, whereas if I
use xrandr's --mode option to set 1920x1080, it choose the 60 Hz rate,
which works.
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1892296
Title:
gnome-control-center cannot change resolution of external monitor
Status in gnome-control-center package in Ubuntu:
Confirmed
Status in mutter package in Ubuntu:
Confirmed
Bug description:
g-c-c is unable to change the resolution on my external 2560x1440
monitor to 1920x1080 - when I try, the monitor turns off.
However, the command "xrandr --output HDMI-1 --mode 1920x1080" does
successfully change the resolution.
xrandr for the monitor shows:
HDMI-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis)
597mm x 336mm
2560x1440 59.95*+
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97
23.98
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1280x1024 75.02 60.02
1280x960 60.00
1360x768 60.02
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
I tried changing the resolution to 1600x1200 using g-c-c and this did
work.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.4-0ubuntu1
Uname: Linux 5.8.1-050801-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 20 11:28:08 2020
InstallationDate: Installed on 2019-07-01 (415 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190606)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to focal on 2019-12-08 (255 days ago)
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https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1892296/+subscriptions
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