I have a Lenovo Ideapad Y560 with an ATI Mobility Radeon HD 5730, and had the same problem.
I have upgraded the BIOS to version 71 and the problem seems to be solved. I have downloaded the BIOS from the Lenovo driver download page specific to the Ideapad Y560 http://consumersupport.lenovo.com/us/en/DriversDownloads/drivers_list.aspx?CategoryID=661448 To avoid downloading a wrong BIOS, I recommend checking your laptop model going to http://consumersupport.lenovo.com/us/en/DriversDownloads/drivers.html and filling the form with your laptop serial number. My specifications: Computer: Lenovo Ideapad Y560 Processor: Intel Core i5 M560 @ 2.67GHz Graphics: ATI Mobility Radeon HD 5730 OS: Ubuntu 11.04 Video Drivers: ATI Propietary FLGRX Driver downloaded and installed via the Additional Drivers applet. Also posted at: http://ubuntuforums.org/showthread.php?t=1768072 Regards, -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/789346 Title: Screen brighness randomly changes on Lenovo Y560 laptop Status in “gnome-power-manager” package in Ubuntu: Confirmed Bug description: My installation of Ubuntu 11.04 randomly changes screen brightness without input from the user. The time between brightness changes can be from hours to seconds. Changing the brightness back manually temporarily fixes this until it changes again. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: xorg 1:7.6+4ubuntu3 ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2 Uname: Linux 2.6.38-8-generic x86_64 NonfreeKernelModules: fglrx Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz Date: Fri May 27 14:14:12 2011 DistUpgraded: Fresh install DistroCodename: natty DistroVariant: ubuntu DkmsStatus: fglrx, 8.840, 2.6.38-8-generic, x86_64: installed EcryptfsInUse: Yes GraphicsCard: ATI Technologies Inc Madison [Mobility Radeon HD 5000 Series] [1002:68c0] (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:3927] InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) JockeyStatus: xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use) Lsusb: Bus 002 Device 003: ID 064e:f207 Suyin Corp. Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: LENOVO IdeaPad Y560 ProcEnviron: LANGUAGE=en_US:en LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=eae539fd-b776-4fb8-8c49-f6d0d205c3f3 ro quiet splash vt.handoff=7 Renderer: Unknown SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/23/2010 dmi.bios.vendor: LENOVO dmi.bios.version: 30CN62WW dmi.board.name: KL3 dmi.board.vendor: Lenovo dmi.board.version: Rev 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: Lenovo dmi.chassis.version: Rev 1.0 dmi.modalias: dmi:bvnLENOVO:bvr30CN62WW:bd07/23/2010:svnLENOVO:pnIdeaPadY560:pvrRev1.0:rvnLenovo:rnKL3:rvrRev1.0:cvnLenovo:ct10:cvrRev1.0: dmi.product.name: IdeaPad Y560 dmi.product.version: Rev 1.0 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2 version.fglrx-installer: fglrx-installer N/A version.ia32-libs: ia32-libs 20090808ubuntu13 version.libdrm2: libdrm2 2.4.23-1ubuntu6 version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2 version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/789346/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
