[Pkg-fglrx-devel] Bug#576942: #576942: /boot/vmlinuz-2.6.32-3-amd64: kernel fix for wrong mtrr mask from MS-7252 bios may be wrong and cause problems with fglrx-driver

Stefanos Harhalakis v13 at v13.gr
Sun Apr 11 17:20:42 UTC 2010

While watching this conversation, I've some comments:

a) The kernel only prints a backtrace. It is not an OOPS or a BUG(). It is 
just a backtrace because the message "mtrr: your BIOS has set up an incorrect 
mask, fixing it up." is printed using the WARN_ONCE() macro. Thus, I don't see 
how it can be classified as a kernel bug. At worst, the bug will have to do 
with using WARN_ONCE.

b) Perhaps you could try using "nopat" as kernel argument. I believe that 
since PAT is used by fglrx, mtrr should have no effect (no? - I'm no expert), 
but who knows. Also, play with fglrx's argument for pat.

c) Perhaps try adding: Option "NoMTRR" to the screen section of xorg.conf for 

If (b) works then this may be a kernel bug, irrelevant with the backtrace.

if (c) works then this *may* be an Xorg bug.

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