Also Confirmed - vendor issue, not Ubuntu - BIOS upgrade fixed brightness / suspend issues as well for me. Everything now works flawlessly.
A bit OT but in case others arrive here via google: the V5-122P BIOS updates *require* you to be running Windows 8 or newer. If you aren't dual booting into Windows, Acer forcing a Windows 8 binary in order to update the BIOS makes for a *very* bad day. FreeDOS does not work, not even WindowsPE on 32-bit works - it has to be Windows 8. Note being, when looking to buy hardware in the future not only will be googling linux compatability, but also checking to make sure the vendor is releasing BIOS patches which are easily installed using Linux as well. -- 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/1315834 Title: 1002:983d [Acer Aspire V5-122P] Unable to adjust screen brightness using Radeon driver Status in linux package in Ubuntu: Fix Released Bug description: While using the Radeon driver, I am unable to adjust the screen brightness on my Acer Aspire V5-122P. Adjusting brightness in the settings applet has no affect. Adjusting brightness with the keyboard function keys turns the screen on and off seemingly randomly. WORKAROUND: sudo -s cd /sys/class/backlight/radeon_bl0 cat max_brightness echo 200 > brightness #Example echo 10 > brightness #Example echo 255 > brightness #Example Upstream post URL: http://www.spinics.net/lists/linux- acpi/msg50719.html ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: lewis 2240 F.... pulseaudio /dev/snd/controlC0: lewis 2240 F.... pulseaudio CurrentDesktop: Unity Date: Sun May 4 10:55:50 2014 HibernationDevice: RESUME=UUID=42931b07-a2e1-49a1-9780-874e1d4300b7 InstallationDate: Installed on 2014-04-14 (19 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326) MachineType: Acer Aspire V5-122P ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=8a594eb2-ccc3-4aa4-a4c5-e872f4033b04 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/18/2013 dmi.bios.vendor: Insyde Corp. dmi.bios.version: V2.08 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Aspire V5-122P dmi.board.vendor: Acer dmi.board.version: V2.08 dmi.chassis.type: 10 dmi.chassis.vendor: Acer dmi.chassis.version: V2.08 dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.08:bd07/18/2013:svnAcer:pnAspireV5-122P:pvrV2.08:rvnAcer:rnAspireV5-122P:rvrV2.08:cvnAcer:ct10:cvrV2.08: dmi.product.name: Aspire V5-122P dmi.product.version: V2.08 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315834/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
