Hi Christopher, thanks for your continued help. The command "echo 8 > /sys/class/backlight/intel_backlight/brightness" does set the brightness to a very low value (basically completely black). This was done with the "acpi_backlight=vendor" kernel parameter in use.
Rebooting "with just kernel parameter video.use_bios_initial_backlight=0" does not change anything (indicator bubble pops up, backlight level doesn't actually change). Rebooting "with just kernel parameter video.use_native_backlight=1" does not change anything (indicator bubble pops up, backlight level doesn't actually change). This did work: "Creating a new file in /usr/share/X11/xorg.conf.d/80-backlight.conf and pasting into it the following code: Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "sna" Option "Backlight" "intel_backlight" # use your backlight that works here BusID "PCI:0:2:0" EndSection " The backlight control now works properly (indicator bubble and proper backlight change). Furthermore, it is now possible to turn off the touchpad by using the function key (the indicator bubble does show up). -- 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/1392016 Title: [Asus UL30VT] Backlight control does not work Status in linux package in Ubuntu: Incomplete Bug description: The backlight control on my Asus UL30VT has not worked for quite a while. It used to work, a few ubuntu versions ago. The backlight control bubble does show up when the function keys on the laptop are pressed. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-39-generic 3.13.0-39.66 ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8 Uname: Linux 3.13.0-39-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: lina 2081 F.... pulseaudio /dev/snd/controlC0: lina 2081 F.... pulseaudio CurrentDesktop: Unity Date: Wed Nov 12 20:20:31 2014 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=c8002bb0-2b05-4952-bc8b-bfcd29ac6117 InstallationDate: Installed on 2013-02-26 (623 days ago) InstallationMedia: This MachineType: ASUSTeK Computer Inc. UL30VT ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=ff44dc17-e11a-4d44-8ab6-bf188f64ed83 ro quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-39-generic N/A linux-backports-modules-3.13.0-39-generic N/A linux-firmware 1.127.8 SourcePackage: linux UpgradeStatus: Upgraded to trusty on 2014-07-20 (115 days ago) dmi.bios.date: 07/14/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 211 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UL30VT 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.:bvr211:bd07/14/2010:svnASUSTeKComputerInc.:pnUL30VT:pvr1.0:rvnASUSTeKComputerInc.:rnUL30VT:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: UL30VT 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/1392016/+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