I don't know if it is the exact same issue but I am seeing this on my Asus Eeepc 1001PXD. Narrowed it down to asle_set_backlight() failing because it is selecting the wrong pipe. There is a commit upstream that works around this by going through all the connectors and setting the backlight if one is present: c91c9f32843 drm/i915: make asle notifications update backlight on all connectors.
I backported this to the ubuntu-trusty.git, and it fixes the issue here. There was a lot of refactoring in i915 between 3.13 and 3.14-rc1, so unfortunately the upstream commit doesn't apply directly, but this patch isn't much different. Apologies if this isn't the same issue, let me know and I'll go file my own bug report. ** Patch added: "backport-i915-asle-backlight-connectors.patch" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4109551/+files/backport-i915-asle-backlight-connectors.patch -- 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/1311297 Title: [ASUS Eeepc 1015PEM] Screen brightness cannot be adjusted Status in “linux” package in Ubuntu: Confirmed Bug description: This is a regression. Up to 13.10 there was no problem changing screen brightness on my Asus Eeepc 1015PEM. This machine has function keys for changing the screen brightness up (with Fn+F6) and down (with Fn+F5). In 14.04 using the function keys causes the indicator to appear and the the brightness bar moves appropriately, but there is no change to screen brightness. Using the slider on the (new?) Brightness and Lock settings form also has no affect on the screen brightness. Operation of the function keys will move the slider. However, repeated use of the function keys causes the slider control to disappear from the form (as is found on a machine where control of screen brightness by function keys are not available). ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic i686 NonfreeKernelModules: wl ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tony 2031 F.... pulseaudio CurrentDesktop: Unity Date: Tue Apr 22 20:12:48 2014 HibernationDevice: RESUME=UUID=fcc3dc2b-0a3b-4dcf-98d9-b1f03b2c812e InstallationDate: Installed on 2012-04-27 (724 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423) MachineType: ASUSTeK Computer INC. 1015PEM ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=abf837ae-032d-4686-8803-27a1376ee9c5 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-04-20 (2 days ago) dmi.bios.date: 10/06/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 0801 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: 1015PE dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: x.xx dmi.chassis.asset.tag: 0x00000000 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer INC. dmi.chassis.version: x.x dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0801:bd10/06/2010:svnASUSTeKComputerINC.:pn1015PEM:pvrx.x:rvnASUSTeKComputerINC.:rn1015PE:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x: dmi.product.name: 1015PEM dmi.product.version: x.x dmi.sys.vendor: ASUSTeK Computer INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+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
