A customer of mine gave me his old notebook because he bought a new one. The laptop is running an p to date Xubuntu 13.10 64bit. Now I'm suffering similar issue with brightness control: when I press the appropriate keys on keyboard the slide appears on the upper right corner of the screen but even if it changes the setting has no effect on the system . The notebook I have has an Intel X3100 integrated video
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c) I tried different combinations on grub but no one resolved the issue. 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). ------------------ effe@Vostro1310:/sys/class/backlight$ for i in /sys/class/backlight/*; do echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness}; done /sys/class/backlight/dell_backlight 1 7 1 ------------------ If I increase the backlight the files are correctly updated: ------------------ /sys/class/backlight/dell_backlight 7 7 7 ------------------ acpi_listen works just on new mainline kernel 3.13.2 (tried bot generic and lowlatency) on stock kernel there isn't output at all: video/brightnessup BRTUP 00000086 00000000 K video/brightnessup BRTUP 00000086 00000000 K video/brightnessup BRTUP 00000086 00000000 K video/brightnessdown BRTDN 00000087 00000000 K video/brightnessdown BRTDN 00000087 00000000 K video/brightnessdown BRTDN 00000087 00000000 K Now I'm using xrandr to change the brightness: effe@Vostro1310:/sys/class/backlight$ xrandr --output LVDS1 --brightness 0.5 What can I try to triage the issue? Thanks. -- 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/1261853 Title: 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight Status in “linux” package in Ubuntu: Triaged Bug description: the change in the level of illumination of the screen, through the corresponding option in the control panel, has no effect. Upstream post: http://www.spinics.net/lists/linux-acpi/msg48075.html WORKAROUND: In Ubuntu kernel only, version 3.11.0-14-generic tested: acpi_backlight=vendor WORKAROUND: In mainline only: video.use_native_backlight=1 ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-14-generic 3.11.0-14.21 ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7 Uname: Linux 3.11.0-14-generic x86_64 ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alex 1443 F.... pulseaudio alex 11159 F.... pulseaudio Date: Tue Dec 17 18:50:13 2013 HibernationDevice: RESUME=UUID=04335018-6e1d-453d-a8ba-25ae1c34f2eb InstallationDate: Installed on 2013-12-14 (2 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcEnviron: LANGUAGE=it PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=it_IT.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed root=UUID=d4cdcfba-0a53-41d0-a9ce-0516d3fab0f0 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-14-generic N/A linux-backports-modules-3.11.0-14-generic N/A linux-firmware 1.116 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/22/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A06 dmi.board.name: 0K08H3 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A06 dmi.modalias: dmi:bvnDellInc.:bvrA06:bd02/22/2013:svnDellInc.:pnInspiron5521:pvrA06:rvnDellInc.:rn0K08H3:rvrA00:cvnDellInc.:ct8:cvrA06: dmi.product.name: Inspiron 5521 dmi.product.version: A06 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853/+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