I upgraded to Ubuntu 17.10 and this bug started appearing (didn't have this with the versions before). When I lock my screen on my Lenovo T450s and the notebook sits in the dock, one of the three things happen when I come back after some time and try to unlock: * Most of the time the computer was just shut down and I have to restart it again * Sometimes the main screen flickers weirdly and one of the two other screens show pixel garbage * The main screen shows the lock screen but is completely frozen. Occasionally unlocking also works.
The last thing I find in /var/log/syslog is [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun Note: Ubuntu uses kernel version 4.13.0-16-lowlatency for some reason, but the issue also appears when I boot with the generic version. -- 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/1695989 Title: i915 *ERROR* CPU pipe A FIFO underrun - graphic glitches Status in linux package in Ubuntu: Incomplete Bug description: 17.04 Ubuntu Gnome with default kernel. Seeing black bars flash on screen, sometimes whole screen goes black. Easily reproduced by having the Gnome Terminal app on the lower part of the screen. Often so bad that the laptop locks up (screen goes black and shuts off without warning after a few seconds). dmesg is full of the "CPU pipe A FIFO underrun" errors. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.10.0-21-generic 4.10.0-21.23 ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11 Uname: Linux 4.10.0-21-generic x86_64 ApportVersion: 2.20.4-0ubuntu4.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: chris 1632 F.... pulseaudio CurrentDesktop: GNOME Date: Mon Jun 5 21:16:06 2017 InstallationDate: Installed on 2017-05-03 (33 days ago) InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412) MachineType: Dell Inc. Latitude E4310 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-21-generic.efi.signed root=UUID=fad75c7e-4ba7-49fd-95c6-dc5d2446b31b ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.10.0-21-generic N/A linux-backports-modules-4.10.0-21-generic N/A linux-firmware 1.164.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/26/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 0T6M8G dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA07:bd05/26/2011:svnDellInc.:pnLatitudeE4310:pvr0001:rvnDellInc.:rn0T6M8G:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E4310 dmi.product.version: 0001 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695989/+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
