[Bug 15166] Changing brightness of backlight freezes kernel with radeon kms enabled.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=15166





--- Comment #56 from Manuel Ullmann <ullman.bugs@gmx.de>  2010-05-24 00:14:19 ---
The fix is in both branches; drm-next and drm-radeon-testing. It is:

commit 7547a917fa5f3b2406f52c7dcf7ec9ad3c8532eb
Merge: a8089e8 6b8b178
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Apr 20 14:15:09 2010 +1000

    Merge branch 'drm-ttm-unmappable' into drm-core-next

    * drm-ttm-unmappable:
      drm/radeon/kms: enable use of unmappable VRAM V2
      drm/ttm: remove io_ field from TTM V6
      drm/vmwgfx: add support for new TTM fault callback V5
      drm/nouveau/kms: add support for new TTM fault callback V5
      drm/radeon/kms: add support for new fault callback V7
      drm/ttm: ttm_fault callback to allow driver to handle bo placement V6
      drm/ttm: split no_wait argument in 2 GPU or reserve wait

    Conflicts:
        drivers/gpu/drm/nouveau/nouveau_bo.c

Steps to confirm:

1. Create new drm-2.6 repository

2. Checkout one of the mentioned branches

3. Reset to this commit

4. Compile, install kernel and reboot

5. Test backlight changing.
-> Result: Bug fixed

6. cd to git repository. Reset to one commit before (git reset --hard HEAD^).

7. Compile, install kernel and reboot

8. Test backlight changing.
-> Result: kms freeze

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