A short suspend works okay. But after maybe 30 minutes
in suspend mode the screen becomes corrupted. A
window-manger refresh is sufficient to get the correct
display again. The bug is present in the released image
file as well as in the released kernel source. Since I
do not know yet enough about the hardware architecture
I have no idea if the problem is in the kernel or the
X-server. Switching of the screen-saver does not help.