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#1 2026-09-11 11:29:55
- SolaireFanboy
- Member
- Registered: 2026-09-10
- Posts: 3
Second display without image & 'Display Configuration' screen glitches
Recently, I did a fresh reinstall on my desktop, using the KDE profile in the 'archinstall' script.
Now, whenever I attempt connecting a second display, namely a 4K TV, no output image shows up on it and the 'Display Configuration' settings screen from KDE Plasma flickers like this: 4 seconds showing both connected displays (1440p monitor connected with DisplayPort and TV) and their options -> menu window flicker -> another 4 seconds of both displays -> flicker -> ~1 second of automatic disconnection to TV display and greyed out options of only X11 scaling and screen tearing -> flicker -> automatic reconnection to TV and the loop restarts.
At first, the resolution on the monitor also changed to what I presume was 3840x2160p, since some of the screen went missing, but resetting the monitor's resolution and making the TV mirror the contents of the monitor seemed to fix that problem.
I had no issues with my previous installation and have no issues connecting my laptop, also installed with Arch and KDE, with the same HDMI cable to the TV.
Desktop GPU: AMD RX 6700XT with latest mesa and Vulkan drivers, including 32-bit variants
Laptop GPU: NVidia MX350 with latest Intel and NVidia drivers
Things I've tried:
- connecting the desktop to the monitor with the "faulty" HDMI cable: works fine
- connecting the laptop to the TV with the "faulty" HDMI cable: works fine
- connecting the desktop to the monitor with another HDMI cable: works fine
- setting the refresh rate to the same value for both the monitor and TV: still no output
- changing the resolution on both displays: still no output
- updating both computers to the latest versions of all installed packages: still no output
- comparing explicitly installed packages (pacman -Qe) between computers: seemingly not much different besides a smaller list of Xorg packages on the desktop, but 'xorg-xrandr', 'xorg-server-common' and 'xorg-xwayland' are installed
EDIT:
Migrated the post from "Applications & Desktop Environments" to "Kernel & Hardware" after seeing similar posts:
- Monitor not working anymore after an upgrade.
- [AMDGPU] 4:2:0 output via HDMI seems broken since kernel 7.2
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#2 Yesterday 17:26:37
- seth
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- From: Won't reply 2 private help req
- Registered: 2012-09-03
- Posts: 77,772
Re: Second display without image & 'Display Configuration' screen glitches
Have you confirmed that you're hitting the same regression(eg. by testing the LTS kernel)?
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#3 Today 01:34:52
- SolaireFanboy
- Member
- Registered: 2026-09-10
- Posts: 3
Re: Second display without image & 'Display Configuration' screen glitches
Have you confirmed that you're hitting the same regression(eg. by testing the LTS kernel)?
I'd attempt checking out the LTS kernel, but Grub ain't listing the installed kernels even after following the wiki's instructions: updating the "grub" file and reloading the config file with "grub-mkconfig". Any tips on fixing that?
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#4 Today 06:21:04
- seth
- Member
- From: Won't reply 2 private help req
- Registered: 2012-09-03
- Posts: 77,772
Re: Second display without image & 'Display Configuration' screen glitches
ls -lR /boot
cat /boot/grub/grub.cfgnb. that what currently breaks stuff for amdgpu is actually the firmware, downgrading linux-firmware-amdgpu to see whether it's coming from there might be worth a shot.
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