Since installing this kernel, I see instant screen garbage or blanking (everything but the cursor), when attaching / removing a second / third screen on My Lenovo Thinkpad T440s.
Older kernels do not suffer these problems. A restart of lightdm makes the problems go away and makes a second screen be detected as expected. What logs would be usefull? Xorg.0.log doesn't realy have anything out of the ordinary, nor does Dmesg. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1770565 Title: [i915_bpo] Fix flickering issue after panel change Status in HWE Next: New Status in linux package in Ubuntu: Invalid Status in linux source package in Xenial: Fix Released Bug description: [Impact] A certain OEM laptop changed the panel type/vendor, and the change regressed the driver causing a flickering image. The ODM has tools to measure various values of the driver/panel combination, and determined that some voltage levels were way too low to pass the spec. The process to bisect the commits took weeks, so while it's technically possible that this issue was fixed by a single commit (drm/i915: Ignore OpRegion panel type except on select machines), we've also kept another 10 commits which upstream thought should help (and did, they improved the measured values but not enough). So, this backport carries all 11 commits from 4.8/4.9 that the ODM verified to pass the tests. [Test case] Needs to be tested with the ODM tools to be sure. [Regression potential] There is some, but apart from the necessary refactoring the rest are bugfixes to match the HW specs, so this should in fact fix a lot more than just this certain machine. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1770565/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
