[Bug 23227] Corrupted X with Radeon/KMS on DEC Alpha

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23227





--- Comment #5 from Matt Turner <mattst88 at gmail.com>  2009-08-10 10:09:25 PST ---
Created an attachment (id=28488)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=28488)
Screenshot of corruption

I grabbed the screenshot with xwd, but it is not representative of how the
corruption actually appears on screen. For instance
- in the screenshot, the background is garbage, but on the screen, it's just
black (which I think is normal)
- text appears in the screenshot, whereas no text appears on the screen
- the borders are corrupted in the screenshot, but they are drawn file on the
screen

The three red lines mentioned before turned out to be the totally-corrupted
cursor.

Turning on SWcursor causes the cursor to not be drawn at all. Option
"EXANoComposite" "true" causes all text on the xdm login screen to not be
drawn. Option "EXANoUploadToScreen" "false" causes more corruption.

Dave suggested on IRC last night that it may be either a cache problem or an
oversight with page sizes.

Notes: (1) Page size on Alpha is 8K. (2) Alpha is extremely relaxed with memory
ordering (see Documentation/memory-barriers.txt in the kernel), and (3) Alpha
is entirely cache coherent by design.


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