On Thu, 2016-06-23 at 15:59 +0300, Jani Nikula wrote: > On Thu, 23 Jun 2016, Steven Newbury <steve@xxxxxxxxxxxxxxx> wrote: > > [ Unknown signature status ] > > On Sun, 2016-06-19 at 14:53 -0700, James Bottomley wrote: > > > On Fri, 2016-06-17 at 16:06 -0700, James Bottomley wrote: > > > > On Fri, 2016-06-17 at 16:34 +0300, Jani Nikula wrote: > > > > > On Fri, 17 Jun 2016, Daniel Vetter <daniel@xxxxxxxx> wrote: > > > > > > On Thu, Jun 16, 2016 at 03:42:12PM -0700, James Bottomley > > > > > > wrote: > > > > > > > On Thu, 2016-06-16 at 14:29 -0700, James Bottomley wrote: > > > > > > > > On Thu, 2016-06-16 at 23:24 +0200, Daniel Vetter wrote: > > > > > > > > > I guess we'll need the bisect on this one to make > > > > > > > > > progress. > > > > > > > > > > > > > > > > Sigh, I was afraid that might be the next step. > > > > > > > > > > > > > > OK, I have a curious data point. I assumed the problem > > > > > > > would > > > > > > > be > > > > > > > somewhere in the drm update, so I started bisecting that > > > > > > > at > > > > > > > the > > > > > > > top. > > > > > > > However, the top most commit: > > > > > > > > > > > > > > commit 1d6da87a3241deb13d073c4125d19ed0e5a0c62c > > > > > > > Merge: 1f40c49 a39ed68 > > > > > > > Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > > > > > > > Date: Mon May 23 11:48:48 2016 -0700 > > > > > > > > > > > > > > Merge branch 'drm-next' of > > > > > > > git://people.freedesktop.org/~airlied/linux > > > > > > > > > > > > > > Isn't actually bad. There's no flicker here, so whatever > > > > > > > caused > > > > > > > the > > > > > > > problem came from some update after this. > > > > > > > > > > > > There was a fixes pull after this. Might be worth it to > > > > > > restrict > > > > > > to > > > > > > just > > > > > > the i915 changes, which are just > > > > > > 5b4fd5b1111b1230cd037..157d2c7fad0863222 > > > > > > > > > > > > Looking at those nothing seems to stick out which might > > > > > > explain > > > > > > what's > > > > > > happening for you. > > > > > > > > OK, so just on the firmware, the system seems less flickery > > > > with > > > > the > > > > new 1.4.3 UEFI, so I'm starting to think it is a Skylake > > > > errata > > > > issue. The flicker isn't gone for good, but seems to be > > > > reboot > > > > dependent (it's there in some boots, but gone on a reboot). > > > > > > > > > This should be easy enough to try before bisecting: > > > > > http://patchwork.freedesktop.org/patch/msgid/1466162081-12042 > > > > > -1-g > > > > > it > > > > > -s > > > > > end-email-mika.kahola@xxxxxxxxx > > > > > > > > Applying this didn't seem to make a difference: still there on > > > > some > > > > and gone on other reboots. > > > > > > 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. > > > > > > > > I'm seeing this on my IvyBridge. I'll try reverting the commit > > here > > too, to see if it's the same issue. > > IvyBridge doesn't have low vswing for eDP. If reverting helps, it's a > different failure mode. > It must be something else then. Actually, in my case linus/master is okay. I saw the subject and though it must be the same issue. I'm seeing it with drm-intel nightly/next branches. Shall I try to bisect it? Symptoms are similar, although I would describe it more like flashes of a different buffer across parts of the screen.
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