Perhaps the problem was just in the installer ISO. The video has been stable on the installed 14.04.
-- 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/1450557 Title: 15.04: Broadwell HD 5500: screen corruption after logout Status in System76: New Status in linux package in Ubuntu: Triaged Bug description: On a 1366x768 Broadwell i3-5010U laptop (System76 Lemur lemu5), sometimes after I logout there is strange horizontal wrapping/scrolling corruption at the lightdm login screen plus a fixed vertical wrapping (see attached video). After the first time that the screen goes wonky, I see this error in dmesg: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun Logging back into to Unity seems to consistently fix the screen corruption after a few seconds. This doesn't happen every time you logout, but probably happens 1/3 of the time or so. Occasionally I'll also see similar corruption during shutdown right around the time that X stops and Plymouth takes over. Interestingly, on a Broadwell i3 desktop connected to a 1920x1080 external display via HDMI, I've never encountered this problem. So it might be related to the specific 1366x768 screen resolution or to the embedded display port (eDP). I filed this bug against the kernel because of the dmesg error from the DRM module... but the problem could just as likely be in xserver- xorg-video-intel. For what it's worth, I've tried the latest 4.0 mainline build from the kernel PPA as well as the 4.1rc1 mainline build, and this problem still exists with both. I've also tried the slightly updated X packages for 15.04 from the xorg-edgers PPA, and this problem is likewise still present. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-15-generic 3.19.0-15.15 ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: oem 1360 F.... pulseaudio /dev/snd/controlC0: oem 1360 F.... pulseaudio CurrentDesktop: Unity Date: Thu Apr 30 10:23:52 2015 HibernationDevice: RESUME=UUID=35ecebc1-3c1c-4a1f-9431-ce62b4803c50 MachineType: System76, Inc. Lemur ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=395797c2-b33c-46b5-9a64-abfcd6416195 ro acpi_backlight=vendor quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.19.0-15-generic N/A linux-backports-modules-3.19.0-15-generic N/A linux-firmware 1.143 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/25/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 5.6.5 dmi.board.asset.tag: Tag 12345 dmi.board.name: Lemur dmi.board.vendor: System76, Inc. dmi.board.version: lemu5 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: System76, Inc. dmi.chassis.version: lemu5 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd02/25/2015:svnSystem76,Inc.:pnLemur:pvrlemu5:rvnSystem76,Inc.:rnLemur:rvrlemu5:cvnSystem76,Inc.:ct9:cvrlemu5: dmi.product.name: Lemur dmi.product.version: lemu5 dmi.sys.vendor: System76, Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/system76/+bug/1450557/+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
