Guidance on how to collect debugging information for compositing issue in gnome-shell

Alex Villacís Lasso a_villacis at
Sat Aug 3 19:38:08 PDT 2013

El 28/07/13 19:56, Alex Villacís Lasso escribió:
> El 28/07/13 13:08, walter harms escribió:
>> 1. I have no clue but maybe some hints:
>> * Do you get the failure also when you do nothing, just stating X ?
>> * Can you trigger that behavier at will or more at random ?
>> * Did you upgrade ? or is that the first installation ?
> Currently I have no way to trigger the failure at will. This Fedora 18 
> installation is clean, not an upgrade from a previous version. 
> However, it has been regularly updated to the most recent Fedora 18 
> packages.
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I might be entirely wrong, but the following behavior looks like a 
resource leak of some sort. It seems that Xv is the most efficient way 
to trigger the bug, but it *will* require quite a few tries. The bug 
still persists with xorg-x11-drv-intel-2.21.12-1.fc18.x86_64 . With the 
G33 chipset, you can try:

1) starting standard gnome desktop with gnome-shell and compositing
2) find a program that invokes Xv, such as totem, mplayer, etc.
3) find any video source playable by the chosen program
4) run the chosen program with the chosen video for 10 seconds, then 
quit the program
5) repeat steps 2 through 4 on the same gnome-shell session about 30 
times, or until the next application window/menu window appears as a 
black rectangle instead of valid data

I do not know whether this can be triggered in anything other than the 
G33 chipset.

The fact that the problem is solvable by restarting Xorg suggests that 
the leak is in userspace, not kernel space.

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