Christopher, I reinstalled my Windows Vista from my restoration DVD just to check if brightness works and I had many difficult installing it. I was able to install an old XP and I discovered multiple errors about ACPI and the brightness control has issues on this OS too: I can see the brightness slider moving but the luminosity don't change. I need a reflow or a moterboard replacement. Seems Linux is enumerating periferals in a different way and is less sensible to hardware failures.
Please, mark this bug as invalid and close it. I'll contact you again if, after the hardware fix, the issue is still present. -- 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/1281176 Title: 8086:2a02 [Dell Vostro 1310] no brightness control on (x)ubuntu 13.10 / 14.04 Status in “linux” package in Ubuntu: Triaged Bug description: When I press the appropriate keys on keyboard (Fn+up/Fn+down) the slider appears on the upper right corner of the screen but the brightness doesn't change. Problem is I have not intel_backlight on /sys/class/backlight folder but just acpi_video0 or dell_backlight (if I set acpi_backlight=vendor on grub). Since I don't have intel_backlight folder I can't apply many of the workaround found here and there. Reported upstream at http://marc.info/?l=linux- acpi&m=139290477319769&w=2 . WORKAROUND: /sys/class/backlight$ for i in /sys/class/backlight/*; do echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness}; done /sys/class/backlight/acpi_video0 1 7 1 If I increase the backlight via funcion keys or terminal the files are correctly updated: $ echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness /sys/class/backlight/acpi_video0 7 7 7 acpi_listen works just on new mainline kernel 3.13.2 (tried bot generic and lowlatency) on stock kernel there isn't output at all: video/brightnessup BRTUP 00000086 00000000 K video/brightnessdown BRTDN 00000087 00000000 K Now I'm using xrandr to change the brightness: xrandr --output LVDS1 --brightness 0.5 but since xrandr is a software overlay my battery life is horrible, I'm stuck on 100% brightness. Beside this, sometimes the brightness slider appears spontaneously without pressing any keys but again with no effect. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-15-generic 3.11.0-15.25 ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10 Uname: Linux 3.11.0-15-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: effe 1526 F.... pulseaudio CurrentDmesg: [ 102.704995] ERROR @wl_dev_intvar_get : error (-1) [ 102.705003] ERROR @wl_cfg80211_get_tx_power : error (-1) Date: Mon Feb 17 13:27:10 2014 HibernationDevice: RESUME=UUID=d0ee674f-0ea7-47e1-ba6f-1a849ba35941 InstallationDate: Installed on 2014-02-10 (6 days ago) InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016) MachineType: Dell Inc. Vostro1310 MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=44ccbe21-7e45-468c-b942-1773a32943b0 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-15-generic N/A linux-backports-modules-3.11.0-15-generic N/A linux-firmware 1.116.2 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/18/2009 dmi.bios.vendor: Dell Inc. dmi.bios.version: A15 dmi.board.name: 0K866H dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: N/A dmi.modalias: dmi:bvnDellInc.:bvrA15:bd03/18/2009:svnDellInc.:pnVostro1310:pvrNull:rvnDellInc.:rn0K866H:rvr:cvnDellInc.:ct8:cvrN/A: dmi.product.name: Vostro1310 dmi.product.version: Null dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1281176/+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
