Please describe the problem:
If I select cosmos theme or random mode, themes using slideshow don't work.
Strangely, it worked on my desktop of amd64, which run amd64 version on gentoo.
But, it doesn't work on ppc and x86 linux on gentoo, too.
When I run the slideshow on terminal but separately from gnome-screensaver, it
works.

 

Steps to reproduce:
1. selct random mode or cosmos-slideshow in screensaver
2. lock screen or just wait until gnome-screensaver activates
3. 


Actual results:
only blank screen appears

Expected results:
sometimes beautiful cosmos image should appear (for random mode)
or always the slideshow should start (for cosmos-slideshow)

Does this happen every time?
almost always, but one of one hundred, the slideshow works.
But I don't know exact frequency of proper working.


Other information:
At first time, I thought the problem is related to the interrupt timing. AMD64
machine has 1000 Hz frequency in its kernel, but others 100Hz or 250Hz.
But after i changed the factor, still the same problem lasts on other machines.
Actually, x86 and ppc are laptop, and ppc is fairly slow (G3-500) but x86 is
quite fast machine (P-M 1.8G). Moreover, both machine have sufficient memory
(640M and 2G respectively).
So I think that the problem occurs on software level, not on hardware.