*** This bug is a duplicate of bug 1550779 *** https://bugs.launchpad.net/bugs/1550779
It appears a number of people are reporting the same kernel error or similar with docks in bug 1550779. And one other user also mentions "HP 840" but an older model. The problems are close enough that I think the best next step is to treat this as a duplicate of bug 1550779 until further progress is made there in teasing out multiple issues as appropriate. ** This bug has been marked a duplicate of bug 1550779 [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun -- 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/1848123 Title: After I turn on the machine in the morning (probably from S3 sleep), it just blinks the displays for a few moments, than it turns to black for seconds and this is an endless loop Status in linux package in Ubuntu: New Status in xorg-server package in Ubuntu: New Bug description: Hello there! I have an HP 840 G5, with an external docking station (HP USB-C Dock G4). All the input and output devices are connected to this docking station" - display on Displayport (x2) - ethernet - keyboard - mouse After I turn on the machine in the morning (probably from S3 sleep), it just blinks the displays for a few moments, than it turns to black for seconds and this is an endless loop. If I reconnect the docking station I can get back one of the displays to life, but the other one remain in sleep state. In the meanwhile after each of these problems, the intel_pstate driver seems to fail, all the processors cores are clocked to 3.6GHz. If I reboot the machine, both the screens are usable again and the intel_pstate driver is able to change the freqency. Kernel version 5.0.0-23 was not able to lower the frequency at all, I had to use the ondemand scheduler. I found these lines for about 5 days in a previous dmesg log. [10443.450243] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent [10443.703810] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun [10444.257321] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent If I can help in any other way, please let me know! Regards ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xorg 1:7.7+19ubuntu7.1 ProcVersionSignature: Ubuntu 5.0.0-31.33~18.04.1-generic 5.0.21 Uname: Linux 5.0.0-31-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: XFCE Date: Tue Oct 15 06:29:14 2019 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company UHD Graphics 620 [103c:83b2] InstallationDate: Installed on 2019-10-08 (6 days ago) InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) MachineType: HP HP EliteBook 840 G5 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-31-generic root=/dev/mapper/elxnoname--vg-root ro audit=0 noquiet nosplash sysrq_always_enabled SourcePackage: xorg Symptom: display Title: Xorg freeze UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/17/2019 dmi.bios.vendor: HP dmi.bios.version: Q78 Ver. 01.07.00 dmi.board.name: 83B2 dmi.board.vendor: HP dmi.board.version: KBC Version 04.59.00 dmi.chassis.asset.tag: 5CG8322Y91 dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrQ78Ver.01.07.00:bd04/17/2019:svnHP:pnHPEliteBook840G5:pvr:rvnHP:rn83B2:rvrKBCVersion04.59.00:cvnHP:ct10:cvr: dmi.product.family: 103C_5336AN HP EliteBook dmi.product.name: HP EliteBook 840 G5 dmi.product.sku: 3WQ22EC#ABB dmi.sys.vendor: HP version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.97-1ubuntu1~18.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~18.04.2 version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.8-0ubuntu0~18.04.2 version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1848123/+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