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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #10 from Timo Aaltonen <tjaalton at ubuntu.com> 2011-09-08 03:06:17 PDT ---
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).

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