[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
This bug has been fixed in Ubuntu LTS 14.04 providing kernel 3.13.0-24-generic . ** Changed in: linux (Ubuntu) Status: Confirmed = Fix Released -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Fix Released Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
** Tags removed: kernel-bug-exists-upstream ** Tags added: needs-upstream-testing -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Confirmed Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
As (probably) a large number of user on linux right now, I'm using the following workaround to handle this issue: 'echo 4590 /sys/class/backlight/intel_backlight/brightness' as root another option might be to use the following xrandr command: xrandr --output [yourscreendevice] -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Confirmed Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
xrandr --output [yourscreendevice] --set Backlight 80 However, in my case (maybe because I have 2 video adapter [cpu/amd] ) the latter xrandr command is equivalent to write in /sys/class/backlight/acpi_video0/brightness which doesn't work. ** Changed in: linux (Ubuntu) Status: Expired = Confirmed -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Confirmed Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete = Expired -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Expired Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
Christopher, This bug is indeed still an issue on the latest 13.10 kernel : Linux 3.11.0-14-generic. I'll try to check with upstream soon but didn't find time for that lately. However, unfortunately I don't think upstream kernel provide change relevant to fix this issue. -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Incomplete Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1225811/+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
[Kernel-packages] [Bug 1225811] Re: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness
Nicolas Devillers, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If it remains an issue, could you please just make a comment to this. Also, could you please test the latest upstream kernel available (not the daily folder, but the one at the top) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.13-rc4 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Summary changed: - [Dell Inspiron 15R 5521] Can't toggle backlight brightness + 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness ** Description changed: - Since raring at least, it is not possible to setup backlight lightness - without adding acpi_backlight=vendor into grub boot option. + Since raring at least, it is not possible to change backlight + brightness. + + WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: - USERPID ACCESS COMMAND - /dev/snd/controlC0: nicolas2839 F pulseaudio + USERPID ACCESS COMMAND + /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f InstallationDate: Installed on 2013-04-08 (160 days ago) InstallationMedia: Ubuntu 12.10 Quantal Quetzal - Release amd64 (20121017.5) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcFB: - 0 inteldrmfb - 1 radeondrmfb + 0 inteldrmfb + 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7 RelatedPackageVersions: - linux-restricted-modules-3.11.0-5-generic N/A - linux-backports-modules-3.11.0-5-generic N/A - linux-firmware1.114 + linux-restricted-modules-3.11.0-5-generic N/A + linux-backports-modules-3.11.0-5-generic N/A + linux-firmware1.114 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago) dmi.bios.date: 06/25/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0HK2KG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A09 dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09: dmi.product.name: Inspiron 5521 dmi.product.version: A09 dmi.sys.vendor: Dell Inc. ** Changed in: linux (Ubuntu) Importance: Medium = Low ** Tags removed: latest-bios-a09 ** Tags added: bios-outdated-a12 ** Changed in: linux (Ubuntu) Status: Confirmed = Incomplete -- 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/1225811 Title: 1002:6601 [Dell Inspiron 15R 5521] Can't toggle backlight brightness Status in “linux” package in Ubuntu: Incomplete Bug description: Since raring at least, it is not possible to change backlight brightness. WORKAROUND: Add acpi_backlight=vendor into grub boot option. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-generic 3.11.0.7.8 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu4 Architecture: amd64 AudioDevicesInUse: USERPID ACCESS COMMAND /dev/snd/controlC0: nicolas2839 F pulseaudio Date: Mon Sep 16 02:05:10 2013
