Hello
MiracleDinner wrote: ↑2023-01-11 16:26
Blacklisting the nvidia driver does not seem to affect the bug. The
install glitch occurs with or without the proprietary drivers installed (as stated previously, it occurs even on a totally fresh install of Debian 11.6 Xfce.)
@MiracleDinner: thanks for having tested it.
@MiracleDinner ,
@None1975:
I further investigated the issue in xfce4 (version: 4.16) on bare metal with Debian Stable (11.6): let me know if you are interested in more details.
I used two different computers:
a) computer with NVIDIA G96CM [GeForce 9600M GT] (driver: nouveau)
b) computer with Intel HD Graphics 620 (driver: i915).
I found that the glitches I reported in [1] disappear if the xfwm4's internal compositor is disabled.
The xfwm4's internal compositor can be disabled in many ways [2]: I tested the "--compositor=off" option (using a stub file for /usr/bin/xfwm4) and the xfwm4-tweaks-settings program.
xfce4 runs much faster disabling the internal compositor, by the way.
Let me know if it works for you.
MiracleDinner wrote: ↑2023-01-11 16:26
The rainbow flash does seem to be contingent on the xfwm4 package, as using the
4.18 version self-backported from bookworm does resolve the rainbow flash (it still
has a black flicker but i find this far more tolerable than the rainbow flash).
This is an interesting finding that could be investigated.
MiracleDinner wrote: ↑2023-01-11 16:26
But it also seems as if something else, possibly hardware related, is part of the cause of this, since I don't experience the bug in VirtualBox virtual machines or on my much older laptop (which has no NVIDIA dGPU, only a intel iGPU).
I agree: probably, different graphic cards / kernel card drivers initialize themselves and their memory in different ways.
[1]
https://forums.debian.net/viewtopic.php?p=765404#p765404
[2]
https://wiki.archlinux.org/title/Xfwm#Composite_manager