On 28/07/12 04:32, j.glisse at gmail.com wrote:
> From: Jerome Glisse <jglisse at redhat.com>
>
> It seems we can not update the crtc scanout address. After disabling
> crtc, update to base address do not take effect after crtc being
> reenable leading to at least frame being scanout from the old crtc
> base address. Disabling crtc display request lead to same behavior.
>
> So after changing the vram address if we don't keep crtc disabled
> we will have the GPU trying to read some random system memory address
> with some iommu this will broke the crtc engine and will lead to
> broken display and iommu error message.
>
> So to avoid this, disable crtc. For flicker less boot we will need
> to avoid moving the vram start address.
>
> This patch should also fix :
>
> https://bugs.freedesktop.org/show_bug.cgi?id=42373
G'day Jerome,
I'm running a Mid 2011, iMac with three heads. Card :
01:00.0 VGA compatible controller: ATI Technologies Inc Device 6720
To make this usable (ie to not cook the machine), I must force the card
into low power mode which I do with this patch :
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c
b/drivers/gpu/drm/radeon/radeon_pm.c
index 6fabe89..de85eda 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -102,7 +102,7 @@ static void radeon_pm_update_profile(struct
radeon_device *rdev)
break;
case PM_PROFILE_LOW:
if (rdev->pm.active_crtc_count > 1)
- rdev->pm.profile_index = PM_PROFILE_LOW_MH_IDX;
+ rdev->pm.profile_index = PM_PROFILE_LOW_SH_IDX;
else
rdev->pm.profile_index = PM_PROFILE_LOW_SH_IDX;
break;
The patch this mail refers to causes moving corruption (like noise) on
about the right hand 1/3rd of the primary monitor.
Reverting either of these patches makes the corruption go away, however
reverting my patch makes the machine unusable as it simply cooks.
I also have to revert : [PATCH] drm/radeon: fix bo creation retry path
or the machine simply panics at X login, however I see that has already
been queued for reversion.
Any advice you could offer to assist me in sorting this would be much
appreciated.
Regards,
Brad.
