[Bug 76957] Pixel artifacts and corruption plus system freeze and instabilities with the free radeon driver (AMD HD 6570)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76957

--- Comment #10 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #9)
> The dmesg output reveals these lines:
> 
> > [    5.343548] radeon 0000:05:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
> > [    5.343550] radeon 0000:05:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
> > [    5.343552] [drm] Detected VRAM RAM=1024M, BAR=256M
> 
> 1G VRAM seems to be a wrong value, since my graphic card holds only 256MB,
> which seems to be seeing as BAR (what’s that stuff?). 
> 
> Anyway, could it be the cause of my problem?

Your board has 1 GB of vram.  The max BAR size is 256 MB regardless of how much
video ram is actually on the card.  The BAR is the CPU's aperture to vram.  The
CPU can only access teh first 256 MB of vram, but the GPU can access the entire
amount of vram.

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