According to https://bugs.launchpad.net/stella/hwe-stella/+bug/1023760/comments/13 , the backlight function should work on 12.04 if BIOS fixed this issue.
But backlight function is still broken on 12.04(amd64, i386), 11.04 and 14.04. -- 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/1152544 Title: HP Envy 23 AIO - No way to dim display Status in “linux” package in Ubuntu: Triaged Bug description: There is a test for cert that dims the display automatically to 50% and then raises the brightness back to 100%. This test failed to change the brightness at all on the Envy 23. I then tried using the Brightness and Lock too in the System Settings menu, and the Brightness slider had no effect at all on the display. There is no working method to alter screen brightness. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.5.0-23-generic 3.5.0-23.35~precise1 ProcVersionSignature: Ubuntu 3.5.0-23.35~precise1-generic 3.5.7.2 Uname: Linux 3.5.0-23-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25. AplayDevices: **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 ApportVersion: 2.0.1-0ubuntu17.1 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1708 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf7c00000 irq 51' Mixer name : 'IDT 92HD91BXX' Components : 'HDA:111d76e0,103c2adc,00100102' Controls : 18 Simple ctrls : 9 Date: Fri Mar 8 05:41:43 2013 HibernationDevice: RESUME=UUID=5a0be338-b72f-4759-947d-2c799a9951e2 InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213) MachineType: Hewlett-Packard 520-1299 MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic root=UUID=759df16a-1f46-4f4e-b7b7-bff65b4d6bec ro quiet splash initcall_debug vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.5.0-23-generic N/A linux-backports-modules-3.5.0-23-generic N/A linux-firmware 1.79.1 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: rts_pstor UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/25/2012 dmi.bios.vendor: AMI dmi.bios.version: 8.10 dmi.board.asset.tag: 3CR2080BJX dmi.board.name: 2ADC dmi.board.vendor: PEGATRON CORPORATION dmi.board.version: 1.05 dmi.chassis.asset.tag: 3CR2080BJX dmi.chassis.type: 3 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnAMI:bvr8.10:bd09/25/2012:svnHewlett-Packard:pn520-1299:pvr1.00:rvnPEGATRONCORPORATION:rn2ADC:rvr1.05:cvnHewlett-Packard:ct3:cvr: dmi.product.name: 520-1299 dmi.product.version: 1.00 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1152544/+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
