Mark, 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 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. -- 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/1486896 Title: On Lenovo Thinkpad Edge E330, the screen backlight flickers badly. Status in linux package in Ubuntu: Incomplete Bug description: Behavior is the same on Ubuntu 14.04 -- 15.04. Steps were taken according to this: https://wiki.ubuntu.com/Kernel/Debugging/Backlight With acpi_backlight=vendor, the flicker stops, and the brightness control doesn't work. However, echo 8 > /sys/class/backlight/intel_backlight/brightness dims the screen. thinkpad-acpi.brightness_enable = 1 does nothing. Old workaround: If no changes are made to boot options, and echo 4437 > /sys/class/backlight/intel_backlight/brightness is done, the flicker stops and the GUI control / acpi_video0 works, but causes flicker again. Workaround 2: Kernel parameters: "thinkpad-acpi.brightness_enable=0 acpi_backlight=vendor" fully fix the bug behavior and retain the brightness control. Issue: the intel_backlight device should be used, the workaround above disables the other devices, leaving only one, thus no conflicts occur. Attaching the necessary files. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-26-generic 3.19.0-26.28 ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4 Uname: Linux 3.19.0-26-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mark 1391 F.... pulseaudio CurrentDesktop: Unity Date: Thu Aug 20 11:21:39 2015 HibernationDevice: RESUME=UUID=7a9e1f17-c57b-4e6f-bb0c-0b090b5d1405 InstallationDate: Installed on 2014-08-22 (363 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: LENOVO 3354DGG ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-26-generic root=UUID=b566feb2-5a5c-4573-8782-b78d130dbc45 ro quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.19.0-26-generic N/A linux-backports-modules-3.19.0-26-generic N/A linux-firmware 1.143.3 SourcePackage: linux UpgradeStatus: Upgraded to vivid on 2015-08-20 (0 days ago) dmi.bios.date: 02/25/2013 dmi.bios.vendor: LENOVO dmi.bios.version: H3ET72WW(1.09) dmi.board.asset.tag: Not Available dmi.board.name: 3354DGG dmi.board.vendor: LENOVO dmi.board.version: 0B98409 Std dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrH3ET72WW(1.09):bd02/25/2013:svnLENOVO:pn3354DGG:pvrThinkPadEdgeE330:rvnLENOVO:rn3354DGG:rvr0B98409Std:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 3354DGG dmi.product.version: ThinkPad Edge E330 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1486896/+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
