David Chatterton, could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.
If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to 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 exactly shown as: kernel-fixed-upstream-3.18 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. If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER 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. ** Attachment removed: "AlsaInfo.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276180/+files/AlsaInfo.txt ** Attachment removed: "BootDmesg.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276181/+files/BootDmesg.txt ** Attachment removed: "CRDA.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276182/+files/CRDA.txt ** Attachment removed: "CurrentDmesg.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276183/+files/CurrentDmesg.txt ** Attachment removed: "IwConfig.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276184/+files/IwConfig.txt ** Attachment removed: "Lspci.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276185/+files/Lspci.txt ** Attachment removed: "Lsusb.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276186/+files/Lsusb.txt ** Attachment removed: "ProcCpuinfo.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276187/+files/ProcCpuinfo.txt ** Attachment removed: "ProcEnviron.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276189/+files/ProcEnviron.txt ** Attachment removed: "ProcInterrupts.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276190/+files/ProcInterrupts.txt ** Attachment removed: "ProcModules.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276191/+files/ProcModules.txt ** Attachment removed: "PulseList.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276192/+files/PulseList.txt ** Attachment removed: "RfKill.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276193/+files/RfKill.txt ** Attachment removed: "UdevDb.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276194/+files/UdevDb.txt ** Attachment removed: "UdevLog.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276195/+files/UdevLog.txt ** Attachment removed: "WifiSyslog.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+attachment/4276196/+files/WifiSyslog.txt ** Description changed: This bug refers to a Dell XPS13-9333 running Ubuntu 14.10. I discovered a workaround to prevent the screen starting with full brightness. - The reference to the workaround advice is: + The reference to the workaround advice is: http://ubuntuhandbook.org/index.php/2014/04/save-screen-brightness-settings-in-ubuntu-14-04/ There is a folder sys/class/backlight/intel_backlight/ containing a number of files such as brightness, actual_brightness and max_brightness. When using Fn-F4 & F5 to control the screen backlight, the two files: brightness and actual_brightness respond by changing there contents to a number which is a proportion of the contents of max_brightness (937). The workaround was to include the line: - echo 569 > /sys/class/backlight/intel_backlight/brightness + echo 569 > /sys/class/backlight/intel_backlight/brightness at the end of the file: /etc/rc.local using gedit (where 569 is a value noted for a typically comfortable level of backlight). This works when doing a restart but, when logging back in after logging out, the backlight comes on at maximum brightness. This particular laptop has a front-facing webcam fitted. Its function can be confirmed by running the Cheese webcam Booth. It would be a vast improvement if the ambient brightness could be sensed by the webcam and used to adjust the backlight brightness. Auto brightness could be selected or not by a tick box in the Brightness & Lock section of System Settings. Similarly, a tick box might also be provided to enable saving of the backlight brightness when shutting down or logging off - --- + --- ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: david 2755 F.... pulseaudio - /dev/snd/controlC1: david 2755 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: david 2755 F.... pulseaudio + /dev/snd/controlC1: david 2755 F.... pulseaudio CurrentDesktop: Unity DistributionChannelDescriptor: - # This is a distribution channel descriptor - # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor - canonical-oem-somerville-precise-amd64-20130203-1 + # This is a distribution channel descriptor + # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor + canonical-oem-somerville-precise-amd64-20130203-1 DistroRelease: Ubuntu 14.10 HibernationDevice: RESUME=UUID=2ce4d026-79c8-46d8-aa78-9a01276f4ada InstallationDate: Installed on 2014-11-08 (29 days ago) InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50 MachineType: Dell Inc. XPS13 9333 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=10c98fc6-0c96-44d3-9e0e-ba93d84dffe6 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 RelatedPackageVersions: - linux-restricted-modules-3.16.0-25-generic N/A - linux-backports-modules-3.16.0-25-generic N/A - linux-firmware 1.138 + linux-restricted-modules-3.16.0-25-generic N/A + linux-backports-modules-3.16.0-25-generic N/A + linux-firmware 1.138 Tags: utopic Uname: Linux 3.16.0-25-generic x86_64 UpgradeStatus: Upgraded to utopic on 2014-11-21 (16 days ago) UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/11/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0D13CR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: XPS13 9333 dmi.sys.vendor: Dell Inc. - --- - ApportVersion: 2.14.7-0ubuntu8 - Architecture: amd64 - AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: david 2755 F.... pulseaudio - /dev/snd/controlC1: david 2755 F.... pulseaudio - CurrentDesktop: Unity - DistributionChannelDescriptor: - # This is a distribution channel descriptor - # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor - canonical-oem-somerville-precise-amd64-20130203-1 - DistroRelease: Ubuntu 14.10 - HibernationDevice: RESUME=UUID=2ce4d026-79c8-46d8-aa78-9a01276f4ada - InstallationDate: Installed on 2014-11-08 (29 days ago) - InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50 - MachineType: Dell Inc. XPS13 9333 - Package: linux (not installed) - ProcFB: 0 inteldrmfb - ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=10c98fc6-0c96-44d3-9e0e-ba93d84dffe6 ro quiet splash vt.handoff=7 - ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 - RelatedPackageVersions: - linux-restricted-modules-3.16.0-25-generic N/A - linux-backports-modules-3.16.0-25-generic N/A - linux-firmware 1.138 - Tags: utopic - Uname: Linux 3.16.0-25-generic x86_64 - UpgradeStatus: Upgraded to utopic on 2014-11-21 (16 days ago) - UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo - _MarkForUpload: True - dmi.bios.date: 09/11/2014 - dmi.bios.vendor: Dell Inc. - dmi.bios.version: A05 - dmi.board.name: 0D13CR - dmi.board.vendor: Dell Inc. - dmi.board.version: A00 - dmi.chassis.type: 8 - dmi.chassis.vendor: Dell Inc. - dmi.chassis.version: 0.1 - dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1: - dmi.product.name: XPS13 9333 - dmi.sys.vendor: Dell Inc. ** Tags added: latest-bios-a04 -- 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/1400155 Title: inconsistent backlight brightness behaviour Status in linux package in Ubuntu: Incomplete Bug description: This bug refers to a Dell XPS13-9333 running Ubuntu 14.10. I discovered a workaround to prevent the screen starting with full brightness. The reference to the workaround advice is: http://ubuntuhandbook.org/index.php/2014/04/save-screen-brightness-settings-in-ubuntu-14-04/ There is a folder sys/class/backlight/intel_backlight/ containing a number of files such as brightness, actual_brightness and max_brightness. When using Fn-F4 & F5 to control the screen backlight, the two files: brightness and actual_brightness respond by changing there contents to a number which is a proportion of the contents of max_brightness (937). The workaround was to include the line: echo 569 > /sys/class/backlight/intel_backlight/brightness at the end of the file: /etc/rc.local using gedit (where 569 is a value noted for a typically comfortable level of backlight). This works when doing a restart but, when logging back in after logging out, the backlight comes on at maximum brightness. This particular laptop has a front-facing webcam fitted. Its function can be confirmed by running the Cheese webcam Booth. It would be a vast improvement if the ambient brightness could be sensed by the webcam and used to adjust the backlight brightness. Auto brightness could be selected or not by a tick box in the Brightness & Lock section of System Settings. Similarly, a tick box might also be provided to enable saving of the backlight brightness when shutting down or logging off --- ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: david 2755 F.... pulseaudio /dev/snd/controlC1: david 2755 F.... pulseaudio CurrentDesktop: Unity DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-precise-amd64-20130203-1 DistroRelease: Ubuntu 14.10 HibernationDevice: RESUME=UUID=2ce4d026-79c8-46d8-aa78-9a01276f4ada InstallationDate: Installed on 2014-11-08 (29 days ago) InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50 MachineType: Dell Inc. XPS13 9333 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=10c98fc6-0c96-44d3-9e0e-ba93d84dffe6 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 RelatedPackageVersions: linux-restricted-modules-3.16.0-25-generic N/A linux-backports-modules-3.16.0-25-generic N/A linux-firmware 1.138 Tags: utopic Uname: Linux 3.16.0-25-generic x86_64 UpgradeStatus: Upgraded to utopic on 2014-11-21 (16 days ago) UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/11/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0D13CR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: XPS13 9333 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+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
