Dear Christopher, I did as instructed. First trying out only the kernel v. 3.15.0-rc5. Then adding the parameter video.use_bios_initial_backlight=0 (with the new kernel) and afterwards switching it to video.use_native_backlight=1, however the boot process always stayed the same: backlight was on at grub, also on at boot splash messages and then turns off before log-in screen.
-- 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/1315697 Title: 1002:68e0 [Asus K52Je] Backlight not working after boot Status in “linux” package in Ubuntu: Incomplete Bug description: There is no backlight on my Asus X52Je notebook after boot. It works fine at the grub stage and splash sreen but afterwards it just goes black (though you can barely see something - that's why i could turn on the monitor clone option and use a secondary display). Function keys work and there is an entrance in /sys/class/backlight/ - it just doesn't do anything. I've had this problem since 12.04 - i think it started after one of the software updates. It did work for quite some time before. I'm now at 14.04 and all the versions up to this point had the same problem (12.10, 13.04, 13.10). Also tried some common workarounds, like: acpi_backlight=vendor acpi_osi=Linux acpi=off The attachements have the required diagnostic files. 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: fglrx ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: drink 2012 F.... pulseaudio /dev/snd/controlC0: drink 2012 F.... pulseaudio /dev/snd/pcmC0D0p: drink 2012 F...m pulseaudio CurrentDesktop: Unity Date: Sat May 3 17:37:38 2014 HibernationDevice: RESUME=UUID=517b6655-6f63-483f-80c0-087e4799c881 MachineType: ASUSTeK Computer Inc. K52Je ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=da0531fa-9dbd-4f69-9179-0dd5b2740f22 ro video.use_native_backlight=1 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127.1 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-04-24 (9 days ago) dmi.bios.date: 01/26/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: K52Je.212 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: K52Je dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: ATN12345678901234567 dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK52Je.212:bd01/26/2011:svnASUSTeKComputerInc.:pnK52Je:pvr1.0:rvnASUSTeKComputerInc.:rnK52Je:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: K52Je dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315697/+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
