Martin Smith, let the scope of this report be only the kernel call trace mentioned in the Description.
Regarding errors noticed in logs, this is not typically considered a bug, especially considering there is no noticed usability impact. Pivoting back to the call trace, the next step is to fully reverse commit bisect from kernel 4.2 to 4.3-rc3 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ? Please note, finding adjacent kernel versions is not fully commit bisecting. Thank you for your understanding. Helpful bug reporting tips: https://wiki.ubuntu.com/ReportingBugs -- 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/1501993 Title: drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]() Status in linux package in Ubuntu: Incomplete Bug description: I'm seeing a kernel hang when I 'dock' my laptop into my docking station; this happens with 4.2, specifically with: linux-image-extra-4.2.0-11-generic linux-image-extra-4.2.0-12-generic https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1501993/+attachment/4483862/+files/kern.log At this point I lose video, and can't do much else without a hard reboot back to linux-image-extra-3.19.0-30-generic. --- ApportVersion: 2.19-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: mart6985 1824 F.... pulseaudio /dev/snd/controlC0: mart6985 1824 F.... pulseaudio DistroRelease: Ubuntu 15.10 HibernationDevice: RESUME=UUID=ef25a70d-08ea-4cfb-a7a0-ab30671365cc InstallationDate: Installed on 2014-07-02 (456 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Dell Inc. Latitude E7440 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.19.0-30-generic N/A linux-backports-modules-3.19.0-30-generic N/A linux-firmware 1.148 Tags: wily Uname: Linux 3.19.0-30-generic x86_64 UpgradeStatus: Upgraded to wily on 2015-09-29 (3 days ago) UserGroups: _MarkForUpload: True dmi.bios.date: 02/02/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A14 dmi.board.name: 03HFCG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn03HFCG:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E7440 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1501993/+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
