Created attachment 81105 [details]
Example of corruption in PA. The skybox texture has been completely
overwritten, partly with textures from other programms, corruption in other
textures is already starting.
Using the R300 driver (git version from 2013-06-19) on a Mobility Radeon X1400
(128MB dedicated ???), I get massive memory corruption which can be seen in the
attached screenshot when running the Planetary Annihilation Alpha.
The game makes use of virtual texturing, thats means a mega texture which won't
possibly fit in the RAM in one piece.
However, it appears like textures which are NOT part of the mega texture have
been mapped into the same address space. I could see other textures, and even
bitmaps from other applications.
In the screenshot, there are large grey stripes for example, however there is
no such texture in the game. The color does match the color of the window
border though. Performing further tests, I even managed to get parts of album
covers from Banshee into PA.
This issue is not only limited to Planetary Annihilation though and the
corruption also works other way around, where applications overwrite the
bitmaps of other applications.
The effects of the corruption are clearly visible in PA due to the large
textures. They are not deterministic, but appear very reliable, most likely due
to the high memory usage.
Using other applications which frequently allocate new textures (like Banshee
with album covers) speeds up the corruption and makes it even visible in other
applications like Firefox, Cinnamon etc., although not reliable.
Attached are:
Screenshot of corruption
Xorg-log
glxinfo output