Bug can be confirmed present in 14.04 with standard LTS kernel and 3.15rc2 kernel from ubuntu mainline kernel-ppa, daily build for april 24th (latest marked trusty at the time, now nonexistent, should I try a newer kernel even if marked utopic?)
I tried upgrading to bios version 2.21, but there was only an installer for win 8, and using it removes the ubuntu boot loader. Will post after getting my computer to boot ubuntu again.. (I would not recommend users without good knowledge of how UEFI bootloaders work to try upgrading the bios) -- 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/1173725 Title: [Acer Aspire V5-171] Backlight cannot be adjusted unless passing acpi_backlight=vendor Status in The Linux Kernel: Unknown Status in “linux” package in Ubuntu: Incomplete Bug description: The boot parameter is suggested as a fix for this model by http://www.linlap.com/acer_aspire_v5-171 (so if it would help, I would suggest classing this bug as "confirmed"). ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic] ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8 Uname: Linux 3.8.0-19-generic x86_64 ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alan 1919 F.... pulseaudio Date: Sat Apr 27 19:59:23 2013 InstallationDate: Installed on 2013-04-27 (0 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: Acer V5-171 MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic.efi.signed root=UUID=ad03cbd3-39e0-4f7e-b0ab-e1ef3abaa88e ro acpi_backlight=vendor quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-19-generic N/A linux-backports-modules-3.8.0-19-generic N/A linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/14/2012 dmi.bios.vendor: Acer dmi.bios.version: V2.04 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: Mimic dmi.board.vendor: Acer dmi.board.version: Type2 - Board Version dmi.chassis.type: 10 dmi.chassis.vendor: Acer dmi.chassis.version: V2.04 dmi.modalias: dmi:bvnAcer:bvrV2.04:bd09/14/2012:svnAcer:pnV5-171:pvrV2.04:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.04: dmi.product.name: V5-171 dmi.product.version: V2.04 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1173725/+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
