Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc6-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => 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/1576616 Title: Monitor intermittently turns off and back on again Status in linux package in Ubuntu: Incomplete Bug description: I'm experiencing an issue after upgrading from Xubuntu 15.10 to 16.04. I'm using a Dell Latitude E7450, attached to a docking station, and connected to two Dell U2715H via mDP, both displaying 2560x1440. Each of the displays intermittently turns off for about 2 or 3 seconds, and then turns back on again. I couldn't tell whether this behaviour is specifically triggered by anything - it seems to happen randomly. There is no notification from the screen's OSD when it goes black. The issue does not occur when the system is booted with the previously installed kernel, 4.2.0-35-generic. Please let me know if you need any further information. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-21-generic 4.4.0-21.37 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: dkozar 1793 F.... pulseaudio /dev/snd/controlC0: dkozar 1793 F.... pulseaudio CurrentDesktop: XFCE Date: Fri Apr 29 11:57:51 2016 InstallationDate: Installed on 2015-10-28 (184 days ago) InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Dell Inc. Latitude E7450 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=4dc74fbd-1097-4419-a15f-7dbac52da6e0 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-21-generic N/A linux-backports-modules-4.4.0-21-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-04-29 (0 days ago) dmi.bios.date: 09/01/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 0Y15C1 dmi.board.vendor: Dell Inc. dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA07:bd09/01/2015:svnDellInc.:pnLatitudeE7450:pvr:rvnDellInc.:rn0Y15C1:rvr:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E7450 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1576616/+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
