I add some additional information.

First, I realize I did not provide details on the installation.
I used the SalixLive Xfce 15.0 (i586/i686, 32-bit) iso to install Salix on my IBM X31.

Examples of seg fault when using xfwm4 with the compositor on :

$ sudo dmesg | grep error
Mot de passe :
[ 77 ...

Hi,

I have an old IBM X31 laptop which uses the RV100, a mobile gpu based on the desktop R100 chip.
Salix OS works great on the computer as long as OpenGL is not requested.

I had to turn off the compositor of xfwm4 as it was crashing Xorg after some time.

Trying to understand why, I realized it ...