On Tue, 2016-06-21 at 17:00 -0400, James Bottomley wrote: > On Tue, 2016-06-21 at 18:44 +0300, Ville Syrjälä wrote: > > On Tue, Jun 21, 2016 at 09:53:15AM -0400, James Bottomley wrote: > > > On Mon, 2016-06-20 at 11:03 +0300, Jani Nikula wrote: > > > > Cc: Ville > > > > > > > > On Mon, 20 Jun 2016, James Bottomley < > > > > James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote: > > > > > OK, my candidate bad commit is this one: > > > > > > > > > > commit a05628195a0d9f3173dd9aa76f482aef692e46ee > > > > > Author: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > > Date: Mon Apr 11 10:23:51 2016 +0300 > > > > > > > > > > drm/i915: Get panel_type from OpRegion panel details > > > > > > > > > > After being more careful about waiting to identify flicker, > > > > > this one seems to be the one the bisect finds. I'm now > > > > > running v4.7-rc3 with this one reverted and am currently > > > > > seeing no flicker problems. It is, however, early days > > > > > because the flicker can hide for long periods, so I 'll wait > > > > > until Monday evening and a few reboots before declaring > > > > > victory. > > > > > > > > If that turns out to be the bad commit, it doesn't really > > > > surprise me, and that in itself is depressing. > > > > > > As far as I can tell, after running for a day with this reverted, > > > this is the problem. The flicker hasn't appeared with it > > > reverted. It's pretty noticeable with this commit included. > > > > Hmm. The only difference I can see is low vs. normal vswing. Panel > > 0 has low, panel 2 has normal. So either the VBT or opregion is > > telling utter lies, or there's some other bug in our low vswing > > support. > > > > To confirm it's really a vswing issue, you should be able to run > > with i915.edp_vswing=2 without flickers on the broken kernel. > > Preliminary boot indicates no flicker with the bad commit included > and this option, but I'll have to run for quite a bit longer to > verify, since it can sometimes be elusive. Two days of runtime seems to confirm this is the problem (still no flicker issues). James _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
