[Bug 28402] random radeon/kms/drm related freezes with kernel 2.6.34

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28402

--- Comment #71 from Martin Steigerwald <Martin at Lichtvoll.de> 2010-09-21 05:31:43 PDT ---
(In reply to comment #70)
> Ok here's an update:
> I've now tested putting the vram at the following locations (in order):
>  - 0x00000000: This is the same location as vram used to be at before the
>                identified bad commit and works.
>  - 0x10000000: This is before GTT (which starts at 0xd0000000), with some
>                room to spare. This works without freezing, tested for two days.
>  - 0xf0000000: This is after GTT (which ends at 0xdfffffff), with some room to
>                spare. This works, tested for two days.
>  - 0xcc000000: This is directly in front of GTT, with no room to spare. This
>                works, tested for several days.
>  - 0xe0000000: This is directly behind GTT, with no room to spare. This where
>                vram is placed starting with the identified commit, and as
>                expected it froze within minutes.

Da Fox, I seem to have the same setup which is not surprising if you also have
an ThinkPad T42:

shambhala:~> dmesg | grep GTT
radeon 0000:01:00.0: GTT: 256M 0xD0000000 - 0xDFFFFFFF
radeon 0000:01:00.0: GTT: 256M 0xD0000000 - 0xDFFFFFFF

Thus I do not think I need to test the same values again. Are there some other
values I should test? Maybe we can share this work.

Thanks for your hints regarding AGP. I think it might make sense to use that
agp mode option, cause:

shambhala:~> lspci | grep AGP
00:01.0 PCI bridge: Intel Corporation 82855PM Processor to AGP Controller (rev
03)
shambhala:~> dmesg | grep -i AGP
[drm] AGP mode requested: 1
agpgart-intel 0000:00:00.0: AGP 2.0 bridge
agpgart-intel 0000:00:00.0: putting AGP V2 device into 1x mode
radeon 0000:01:00.0: putting AGP V2 device into 1x mode
[drm] AGP mode requested: 1
agpgart-intel 0000:00:00.0: AGP 2.0 bridge
agpgart-intel 0000:00:00.0: putting AGP V2 device into 1x mode
radeon 0000:01:00.0: putting AGP V2 device into 1x mode

Did you set the agpmode module parameter for radeon or are you getting 4x setup
automatically? If the later I wonder why I get 1x automatically.

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