[Bug 18871] [RV100 QY] Blank screen unless glx disabled

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=18871





--- Comment #14 from Jeff Trull <jetrull at sbcglobal.net>  2009-02-19 13:13:21 PST ---
I think I found the kernel bug - aperture size is calculated by different code
if in 64b mode (arch/x86/kernel/aperture_64.c) versus 32b mode
(drivers/char/agp/amd64-agp.c).  There's a section of very similar (possibly
cut+paste then modified) code in the two files but in the 32b version an early
exit is taken.  I removed this early exit so the aperture size would be
recalculated and got the correct value.  Now running glx in 32b mode with my
hacked kernel:

OpenGL renderer string: Mesa DRI Radeon 20061018 AGP 4x x86/MMX+/3DNow!+/SSE2
NO-TCL

I'm off to make a kernel bug report.  Thanks for your help.


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