Sergiu Sincan, regarding https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1529020/comments/3 that patch was subsequently declined by upstream.
Despite this, at your earliest convenience, could you please test the latest upstream kernel available from the very top line at the top of the page from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release names are irrelevant for testing, and please do not test the daily folder)? Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow additional upstream developers to examine the issue. If testing on your main install would be inconvenient, one may: 1) Install Ubuntu to a different partition and then test this there. 2) Backup, or clone the primary install. If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description: kernel-fixed-upstream kernel-fixed-upstream-X.Y-rcZ Where X, and Y are the first two numbers of the kernel version, and Z is the release candidate number if it exists. If the mainline kernel does not fix the issue, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-X.Y-rcZ Please note, an error to install the kernel does not fit the criteria of kernel-bug-exists-upstream. Once testing of the latest upstream kernel is complete, please mark this report's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Changed in: linux (Ubuntu) Importance: Low => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1529020 Title: Braswell: CPU pipe C FIFO underrun when mouse pointer changes display Status in linux package in Ubuntu: Incomplete Bug description: Machine is a HP 250 G4 notebook with Celeron N3050, with BIOS F.1A Rev.A (latest). When I add a external display (VGA, 1920x1080@60Hz), sometimes when I cross over to it with the mouse cursor, it flickers (turns off for about 1-2 seconds), and I get: [ 692.452293] [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe C FIFO underrun. It will do this for 2-3 times, and then it will turn off completely (external display has no VGA signal). Also reproduces with Kubuntu 15.10 (in Live mode). ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xserver-xorg-video-intel-lts-vivid 2:2.99.917-1~exp1ubuntu2.2~trusty1 ProcVersionSignature: Ubuntu 3.19.0-42.48~14.04.1-generic 3.19.8-ckt10 Uname: Linux 3.19.0-42-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CurrentDesktop: KDE Date: Thu Dec 24 10:03:17 2015 InstallationDate: Installed on 2015-12-23 (0 days ago) InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) SourcePackage: xserver-xorg-video-intel-lts-vivid UpgradeStatus: No upgrade log present (probably fresh install) --- ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: srj 2051 F.... pulseaudio CurrentDesktop: KDE DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=f02a8c10-0cdd-4881-962b-86301eb89a58 InstallationDate: Installed on 2015-12-23 (23 days ago) InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) MachineType: Hewlett-Packard HP 250 G4 Notebook PC NonfreeKernelModules: wl Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-43-generic.efi.signed root=UUID=4ce84895-a22a-4619-9dac-e2f82a3add95 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10 RelatedPackageVersions: linux-restricted-modules-3.19.0-43-generic N/A linux-backports-modules-3.19.0-43-generic N/A linux-firmware 1.127.19 Tags: trusty Uname: Linux 3.19.0-43-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/10/2015 dmi.bios.vendor: Insyde dmi.bios.version: F.1A dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: 80C5 dmi.board.vendor: Hewlett-Packard dmi.board.version: 97.40 dmi.chassis.asset.tag: Chassis Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsyde:bvrF.1A:bd09/10/2015:svnHewlett-Packard:pnHP250G4NotebookPC:pvrType1ProductConfigId:rvnHewlett-Packard:rn80C5:rvr97.40:cvnHewlett-Packard:ct10:cvrChassisVersion: dmi.product.name: HP 250 G4 Notebook PC dmi.product.version: Type1ProductConfigId dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1529020/+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
