I've raised https://bugs.freedesktop.org/show_bug.cgi?id=97888 I'll attach the info you requested once I get back to my machine
On 21 September 2016 at 07:56, Maarten Lankhorst <maarten.lankhorst at linux.intel.com> wrote: > Hey, > > Op 20-09-16 om 20:45 schreef Mike Lothian: >> Hi >> >> I've bisected back to this commit in the drm-intel-nightly branch >> >> 05a76d3d6ad1ee9f9814f88949cc9305fc165460 is the first bad commit >> commit 05a76d3d6ad1ee9f9814f88949cc9305fc165460 >> Author: Lyude <cpaul at redhat.com> >> Date: Wed Aug 17 15:55:57 2016 -0400 >> >> drm/i915/skl: Ensure pipes with changed wms get added to the state >> >> If we're enabling a pipe, we'll need to modify the watermarks on all >> active planes. Since those planes won't be added to the state on >> their own, we need to add them ourselves. >> >> Signed-off-by: Lyude <cpaul at redhat.com> >> Reviewed-by: Matt Roper <matthew.d.roper at intel.com> >> Cc: stable at vger.kernel.org >> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com> >> Cc: Daniel Vetter <daniel.vetter at intel.com> >> Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com> >> Cc: Hans de Goede <hdegoede at redhat.com> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com> >> Link: >> http://patchwork.freedesktop.org/patch/msgid/1471463761-26796-6-git-send-email-cpaul >> at redhat.com >> >> The symptoms I'm seeing look like tearing at the top of the screen and >> it's especially noticeable in Chrome - reverting this commit makes the >> issue go away >> >> Let me know if you'd like me to raise a bug > Please do so, it's nice to refer to when making a fix for it. > > Could you attach the contents of /sys/kernel/debug/dri/0/i915_ddb_info for > working and not-working in it? > > ~Maarten