I have a weird problem with darktable. It started to show green squares in the lighttable thumbnails:
These green squares are moving for the first 1-2 seconds after start. Then they are fixed but they are moving again when I hover the mouse over the thumbnails. I have opened an issue with darktable on github which also contains a short video showing that effect:
The github issue is closed in the meantime because it does not seem to be an DT issue. But rather it has to do with my system. Something has changed over the last couple of weeks and I do not know what.
I downgraded gtk3 and gtk4 and linux-firmware but that did not help. I failed to downgrade the xserver. Somehow I always end up with a frozen lightdm login when I tried that.
Does anybody have an idea how I can debug this issue?
I did this. I tried LTS and linux-zen. Also, I booted my PC with a persistent live USB installation (created with ALMA a long while ago). This installation still has linux 5.14.12.arch1-1 and linux-lts 5.10.73-1 and it shows the same issue.
I installed latest darktable 3.6.1, but downgrading to 3.4 does not help either. And this is really weird because I am a frequent DT user and I never had this issue before.
In the meantime I have booted into a live fedora fc34 system and checked DT 3.6.1 on fedora. It does not have the issue. That tells me that (1) I do not have a hardware or BIOS issue and (2) this is not an issue with darktable but with some other package.
And I have removed all thumbs from $HOME/.cache/darktable and this does not help either
And the issue occurs also with a new user on the PC.
Downgrading these two packages is tricky. With their installation all the relevant xf86-video-* packages got removed. They need to be reinstalled. The EndeavourOS live USB image from 2021-08-27 helped me to identify the missing packages.