On Wed, Sep 5, 2012 at 12:39 AM, Brad Campbell brad@fnarfbargle.com wrote:
On 28/07/12 04:32, j.glisse@gmail.com wrote:
From: Jerome Glisse jglisse@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 :
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.
Low profile is not suited to drive 2 monitors and hence is not supported.
Cheers, Jerome
Thanks for that. I was naive enough to expect that answer, yet ask anyway.
Is there anyone that can point me towards a configuration (three heads) with functioning power management?
Regards, Brad