I have the same issue. Kubuntu 22.04, after sleep/screen lock my usb-c
-> display port connected monitor goes from 5120x1440 down to 3840x2160.
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I had the same issue with a NEC display on Debian stable and AMD gpu.
Interestingly, *enabling* DDC/CI seems to solve it, at least so far.
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Happens with me too after sleep/wakeup lenovo x1 carbon gen8 / HDMI LG 27GL850
which should run at 2460x1440@60hz but instead its 1920x1080@60hz.
In my case only restart works. One thing I noticed is that my screen is
initally determined as LG Electronics 31" but its actually 27" monitor
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I see that if I disable "Automatic screen lock", it does not happen any
more, even if the screen goes blank for a long time.
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https://bugs.launchpad.net/bugs/1978980
Title:
I have the same problem on my Dell Latitude 5400 on Ubuntu 22.04.2 LTS
connected via HDMI to AOC Q3279VWFD8. After sleep the resolution goes
from 2560x1440 75hz to 1920x1080 60hz
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Disabling DDC/CI on my monitor appears to have resolved this issue for
me.
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https://bugs.launchpad.net/bugs/1978980
Title:
[amdgpu] Wrong external screen resolution after
Experiencing this on Dell XPS 13:
Ubuntu 20.04.5 LTS
Gnome 3.36.8
X11
Mesa Intel® Graphics (ADL GT2)
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https://bugs.launchpad.net/bugs/1978980
Title:
[amdgpu] Wrong
Experiencing this as well.
22.04 LTS
Lenovo Lenovo YOGA 720-15IKB
Intel® HD Graphics 630
External Dell monitor native resolution 2560x1440, connected through USB-C
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Fresh installation Ubuntu 20.04 LTS with all updates / Fresh
installation with all updates 22.04 LTS.
Thinkpad X230 and external display. Default resolution external display
2560x1440. After screenlock the external display has a different
resolution. Sometimes 1920x1080 or 1280x720. Only
I have the same issue on a Dell Latitude 5490 running Ubuntu 22.04.1 LTS.
The Dell is connected via USB-C to DisplayPort (DisplayPort alt mode) to an
external monitor (Dell Alienware aw3821dw).
After the screen locks and display went to sleep mode and I return to my desk,
the screen always has a
I don't know if my problem is the same as this bug or not. Ubuntu
22.04.1 LTS clean install.
Dell Latitude 5520 laptop.
I have two external monitors attached, one via HDMI and one via USB-C
(different resolutions on each monitor)
After the screen locks, when coming back after 15 minutes or so
Not only the resolution is wrong for the USB-C display but also the
order is different. Unplugging and plugging the connector seems to fix
the issue (Ubuntu 22 LTS).
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xorg-server (Ubuntu)
Status: New => Confirmed
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No success, the downgrade doesn't work either. Today morning, wrong
resolution after the wake up. It seems as if the monitor wakes up with
correct resolution if there is just a little period between sleep and
wake up. But when there's a longer period in between, it wakes up with
wrong resolution.
The bug is also effective on ubuntu 20.04.3 - fresh installation with all
updates. But it wasn't effective prior updating.
After downgrading xserver-xorg-legacy and xserver-xorg-core from
2:1.20.13-1ubuntu1~20.04.3 back to the version 2:1.20.13-1ubuntu1~20.04.2, the
problem seems to be gone.
The bug is also effective on ubuntu 20.04 (fresh installation with all
updates).
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https://bugs.launchpad.net/bugs/1978980
Title:
[amdgpu] Wrong external screen resolution
** Summary changed:
- Wrong external screen resolution after wake up from sleep
+ [amdgpu] Wrong external screen resolution after wake up from sleep
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags
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