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. > > This should be easy enough to try before bisecting: > http://patchwork.freedesktop.org/patch/msgid/1466162081-12042-1-git-s > end-email-mika.kahola@xxxxxxxxx I'll try that. You should know this platform has a firmware bug in the digital signals across the display port ... some problem with the mux in the thunderbolt. Unfortunately the microcode update for this (the thunderbolt firmware) can't be applied from Linux or even the usual FreeDOS, so I'm a bit stuck. It's also been pointed out to me off list that there's a lot of Skylake errata that have display flicker due to non-graphics issues: http://www.intel.com/content/www/us/en/processors/core/desktop-6th-gen-core-family-spec-update.html My system is a Dell XPS 9350 and I have updated it with the just released firmware: http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=VNT5J Which causes my cpu microcode version to go from > [ 2.314472] microcode: CPU0 sig=0x406e3, pf=0x80, revision=0x82 to > [ 2.264669] microcode: CPU0 sig=0x406e3, pf=0x80, revision=0x8a But thanks to the completely opaque microcode update process via the OEMs it's not clear whether this is sufficient to fix the errata that are listed as causing flicker (the reported revision on current skylake lenovos seems to be 0x94) James _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
