Hi,
Disabling acceleration kills performance, so this is really the last resort.
It also leads to minor graphics glitches (the frame borders around the windows are sometimes not redrawn correctly), but I greatly prefer this over editor windows without visible text ;-)
I might add that in Jeroens' case the problem occurred although he uses only one single monitor, however with a higher number of pixels. So maybe the problem is somehow related to a limited amount of graphics memory.Seems unlikely to me, your card seems to have 128 MB memory and Jeroen's has even 256 if I read his report correctly.
I also doubt that the problem is about _physical_ memory. But maybe it has something to do with the amount of memory that the graphics driver allocates for doing its stuff (and just as a background information, driver programming is almost as obscure to me as understanding women, so I am probably completely wrong about this). My main point was just that two monitors seem not to be a requirement for reproducing the bug.
2. the file /etc/modprobe.d/nouveau.conf did not yet exist and had to be created. I also ran update-initramfs -u to put the option into the initrd (didn�´t test whether it also works without that, though).By default graphics drivers are not included in the initramfs, so that should not be necessary.
This is interesting to know; thank you. Best regards, Jan