On Wed, Sep 5, 2012 at 12:39 AM, Brad Campbell <brad@xxxxxxxxxxxxxxx> wrote: > On 28/07/12 04:32, j.glisse@xxxxxxxxx wrote: >> >> From: Jerome Glisse <jglisse@xxxxxxxxxx> >> >> 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. Low profile is not suited to drive 2 monitors and hence is not supported. Cheers, Jerome _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
