Public bug reported: After updating from 14.04 to 16.04 xenial, I am experiencing a screen flickering issue. The screen periodically completely blanks out. I tried the following kernels: 4.10.0 (daily from 1/30/2017) 4.4.0-59 (ships with 16.04) 4.1.21 (recommended from another random thread)
All with the same problem. Possibly related is this error from dmesg: [ 5.138438] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable link training [ 5.141129] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start channel equalization [ 5.343585] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun I also tried the following kernel options: i915_enable_fbc=0 i915_enable_rc6=0 I installed and ran the Intel graphics update tool as well. The issue occurs on a X1 Carbon (3rd gen) laptop and only with an external monitor plugged into mDisplayPort at the maximum resolution (4k). If the resolution is lowered from the max, the flickering goes away. Any help would be greatly appreciated. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-59-generic 4.4.0-59.80 ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35 Uname: Linux 4.4.0-59-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: rvanguri 1836 F.... pulseaudio /dev/snd/controlC1: rvanguri 1836 F.... pulseaudio /dev/snd/controlC0: rvanguri 1836 F.... pulseaudio CurrentDesktop: XFCE Date: Mon Jan 30 18:01:51 2017 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=0a55c618-23a5-4af9-9a32-cf23efc5466a InstallationDate: Installed on 2017-01-21 (9 days ago) InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) MachineType: LENOVO 20BSCT01WW ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-59-generic.efi.signed root=/dev/mapper/xubuntu--vg-root ro quiet splash RelatedPackageVersions: linux-restricted-modules-4.4.0-59-generic N/A linux-backports-modules-4.4.0-59-generic N/A linux-firmware 1.157.6 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/04/2016 dmi.bios.vendor: LENOVO dmi.bios.version: N14ET34W (1.12 ) dmi.board.asset.tag: Not Available dmi.board.name: 20BSCT01WW dmi.board.vendor: LENOVO dmi.board.version: 0B98417 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN14ET34W(1.12):bd02/04/2016:svnLENOVO:pn20BSCT01WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCT01WW:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20BSCT01WW dmi.product.version: ThinkPad X1 Carbon 3rd dmi.sys.vendor: LENOVO ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1660485 Title: Screen flicker with Intel i915 driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1660485/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs