[Bug 40103] Striped screen with CAICOS chip (1002:6779)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40103

--- Comment #11 from Michel Dänzer <michel at daenzer.net> 2011-09-08 03:21:53 PDT ---
(In reply to comment #10)
> I tried this:
> 
> diff --git a/drivers/gpu/drm/radeon/evergreen.c
> b/drivers/gpu/drm/radeon/evergreen.c
> index 15bd047..1630423 100644
> --- a/drivers/gpu/drm/radeon/evergreen.c
> +++ b/drivers/gpu/drm/radeon/evergreen.c
> @@ -1404,6 +1404,7 @@ int evergreen_cp_resume(struct radeon_device *rdev)
> 
>         rdev->cp.rptr = RREG32(CP_RB_RPTR);
>         rdev->cp.wptr = RREG32(CP_RB_WPTR);
> +       rdev->cp.wptr &= rdev->cp.ptr_mask;
> 
>         evergreen_cp_start(rdev);
>         rdev->cp.ready = true;
> 
> but it just hung the machine when X had started (before it got to write any
> logs).

Sounds like the change did make a difference though... can you attach dmesg for
that?

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