Bug#461649: Follow-Up with pictures of black flickering bands

Stephen Benoit (Linux) linux at magnumline.com
Thu Mar 20 13:35:40 PDT 2008

Hi, Alex.  Thanks for your reply.

>>  If you can think of any options I could try, including kernel modules
>>  (buggy intel_agp or radeonfb?), please let me know!
> Does adjusting the DisplayPriority option help (see radeon man page)?
> Some other options to try:
> Option "BusType" "PCI"
> Option "AGPMode" "X" where X is 1,2,4, or 8 (depending on your chipset)
> Option "DRI" "False"

At first, I thought DisplayPriority "HIGH" gave an improvement, but it
did not last.  BusType as "PCI" or "AGP" did not change the shaking.
Turning off DRI made everything slower, of course, but I still have the
problem.  AGPMode 1, 2 and 4 have no noticeable change, 8 was rejected.

BTW, I am using the drm module from the stock kernel  Are
these versions current/appropriate?  These are some exerpts from the
kernel log:

[   23.896522] Linux agpgart interface v0.102
[   24.179208] agpgart: Detected an Intel 865 Chipset.
[   24.186347] agpgart: AGP aperture is 128M @ 0xf0000000
[  205.364257] [drm] Initialized drm 1.1.0 20060810
[  205.369473] [drm] Initialized radeon 1.28.0 20060524 on minor 0
[  207.225469] agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
[  207.225490] agpgart: Device is in legacy mode, falling back to 2.x
[  207.225501] agpgart: Putting AGP V2 device at 0000:00:00.0 into 4x mode
[  207.225541] agpgart: Putting AGP V2 device at 0000:01:00.0 into 4x mode
[  207.909309] [drm] Setting GART location based on new memory map
[  207.909364] [drm] writeback test succeeded in 1 usecs

Thanks for looking into this!  Any help is welcome.

Best regards,

Stephen Benoit
linux at magnumline.com

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