Sorry, I don't think the backlight problem on the V5-171 is a regression. I've never had it work as expected.
I've now tried the acpi_osi="!Windows 2012" test, to see if this machine could be added to the temporary blacklist. I.e. whether my bug was a regression caused when Linux added the "Windows 2012" OSI string.[1] Unfortunately that boot option didn't help. [1] https://bugzilla.kernel.org/show_bug.cgi?id=51231#c137 The result from testing v3.11-rc2 is that it does fix the problem. And as expected, the revert in v3.11-rc3 breaks it again. To answer the question about firmware upgrades, I'm not going to try that unless it helps upstream. It's not worth reflashing "at my own risk" just to avoid passing acpi_backlight=vendor. -- 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 : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
