This kernel also shows continuous rendering artifact on the native LCD screen, such as the windows underneath the current active window appear as flickering ghosts. No problems on the previous released kernel.
-- 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/1884546 Title: Lenovo T440s hangs on the dock when unsleeping the monitor Status in linux package in Ubuntu: Confirmed Bug description: This issue has been a persistent but infrequent problem for many years with the T440s. It only occurs when the laptop is docked. I have reported this bug several times. However, with the current kernel release, 5.4.0-37, this occurs at least once a day. The kern.log lines are: Jun 21 16:44:23 magpie kernel: [13992.853712] [drm:intel_set_cpu_fifo_underrun_r eporting [i915]] *ERROR* uncleared fifo underrun on pipe B Jun 21 16:44:23 magpie kernel: [13992.853749] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun Jun 21 17:17:00 magpie kernel: [15950.119066] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe B Jun 21 17:17:00 magpie kernel: [15950.119101] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ followed by a dead hang. The pattern is the same each time. My current work around is to use the previous version of the released kernel, 5.4.0-33, which does not have this issue. I'm hoping someone has an idea. It's very frustrating. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-37-generic 5.4.0-37.41 ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41 Uname: Linux 5.4.0-37-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: weinberg 3505 F.... pulseaudio /dev/snd/controlC1: weinberg 3505 F.... pulseaudio /dev/snd/controlC0: weinberg 3505 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Jun 22 10:02:42 2020 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=8d33a538-4ec4-418d-b277-be1a9a1c1113 InstallationDate: Installed on 2018-03-12 (832 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180114) MachineType: LENOVO 20ARA0S100 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-37-generic root=UUID=b6683bc1-7dd5-4afd-8e70-f69253403b71 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-37-generic N/A linux-backports-modules-5.4.0-37-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-04-24 (58 days ago) dmi.bios.date: 03/19/2014 dmi.bios.vendor: LENOVO dmi.bios.version: GJET74WW (2.24 ) dmi.board.asset.tag: Not Available dmi.board.name: 20ARA0S100 dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrGJET74WW(2.24):bd03/19/2014:svnLENOVO:pn20ARA0S100:pvrThinkPadT440s:rvnLENOVO:rn20ARA0S100:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.family: ThinkPad T440s dmi.product.name: 20ARA0S100 dmi.product.sku: LENOVO_MT_20AR_BU_Think_FM_ThinkPad T440s dmi.product.version: ThinkPad T440s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1884546/+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
