In this case, we can ask BIOS to create an extra WMI method for us to adjust the brightness from software during the development period. But it's too late to discuss with them.
Or we could ask BIOS to remove all _BCL, _BCM method in the BIOS, so that the system won't create any acpi_video* directories under /sys/class/backlight/ , so there won't be a brightness sliderbar in the birghtness GUI. -- 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/1203982 Title: [Dell Inspiron One 2020] Unable to adjust screen brightness Status in “linux” package in Ubuntu: Confirmed Bug description: CID: 201301-12632 Dell Inspiron One 2020 On this all-in-one desktop, I was unable to adjust screen brightness in System Settings/Brightness and Lock The slidebar of brightness level could be freely adjusted , but nothing happens. The OSD works fine on this system, screen brightness could be adjusted through it But the change is not reflected in "Brightness and Lock" 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: ALC662 rev3 Analog [ALC662 rev3 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: ALC662 rev3 Analog [ALC662 rev3 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1575 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf7d00000 irq 42' Mixer name : 'Realtek ALC662 rev3' Components : 'HDA:10ec0662,10280579,00100300' Controls : 17 Simple ctrls : 8 Date: Tue Jul 23 02:47:00 2013 HibernationDevice: RESUME=UUID=0c9d79aa-e95b-4c59-b8e4-c51b862b1982 InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213) MachineType: Dell Inc. Inspiron One 2020 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=36293b43-a3d7-4ff2-a6f7-608f8002990b 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 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/30/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 03KE02 dmi.board.vendor: Dell Inc. dmi.board.version: X02 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA05:bd01/30/2013:svnDellInc.:pnInspironOne2020:pvr:rvnDellInc.:rn03KE02:rvrX02:cvnDellInc.:ct3:cvr: dmi.product.name: Inspiron One 2020 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1203982/+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
