driver switch on session restart compromised

[wildtruc]

I did not make driver switch since 595 and post kernel 7.
It appears that lightdm wont now restart correctly as it usually did.
it could be new security levels add to kernel 7 or in 610 serie, even in lightdm, I can"t tell at this point.
I made a few tests but notthing worked at the moment.

Anyway, this not fatal even if you still use it, a simple system reboot is enough, but prefer "reboot" choice until a solution will be found (if tthere is a solution)

[wildtruc]

Issue solved more quickly than expected.

After, googleing and didn't find something useful, I queried the help of chat bot to try to debunk the problem. I'm not a fan of chat bots, but when you're on your own, it simplified greatly the research and learn some useful things. And effectively, it did.

The problem came from kernel 7 behaviour concerning the DRM management.
The module's reloading script was using a modprobe command line already used in other scripts of the kind, but this kernel is more strict, and modules was reloaded too fast for it and put lightdm and X in confusion because DRM were loaded at the same time as lightdm, not good idea.
After removing the modprobe command line and add udevadm settle to be sure that all /dev devices were loaded before the restart of lighdm (I didn't know this command, that's the case where chat bot are useful) everything went well and modules were switched gracefully a multiple times.

So, issue solved, at least until the next ...