apport information ** Tags added: apport-collected hera
** Description changed: Backlight controls do not have any effect on a Macbook7,1 running Ubuntu 18.04. Ubuntu is installed in Legacy BIOS mode and uses the proprietary Nvidia drivers. The apple_backlight directory appears in /sys/class/backlight and while different brightness values can be set, they have no effect on the backlight's emitted brightness. The backlight remains at full brightness. I have tested the following kernel parameters but they have no effect. acpi_backlight=vendor video.use_bios_initial_backlight=0 acpi_osi= video.use_native_backlight=1 + --- + ProblemType: Bug + ApportVersion: 2.20.9-0ubuntu7.23 + Architecture: amd64 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: jordan 1659 F.... pulseaudio + CurrentDesktop: Pantheon + DistroRelease: elementary OS 5.1.7 + InstallationDate: Installed on 2021-01-30 (9 days ago) + InstallationMedia: elementary OS 5.1 "hera" - stable amd64 (20200814) + MachineType: Apple Inc. MacBook7,1 + NonfreeKernelModules: nvidia wl + Package: linux (not installed) + ProcFB: 0 VESA VGA + ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-65-generic root=UUID=6cdd2f7b-d747-4fbc-8062-317304a148a6 ro rootflags=subvol=@ quiet splash vt.handoff=1 + ProcVersionSignature: Ubuntu 5.4.0-65.73~18.04.1-generic 5.4.78 + RelatedPackageVersions: + linux-restricted-modules-5.4.0-65-generic N/A + linux-backports-modules-5.4.0-65-generic N/A + linux-firmware 1.173.19 + Tags: hera + Uname: Linux 5.4.0-65-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: sudo + WifiSyslog: + + _MarkForUpload: True + dmi.bios.date: 02/02/18 + dmi.bios.vendor: Apple Inc. + dmi.bios.version: MB71.88Z.003F.B00.1802022149 + dmi.board.name: Mac-F22C89C8 + dmi.board.vendor: Apple Inc. + dmi.chassis.type: 10 + dmi.chassis.vendor: Apple Inc. + dmi.chassis.version: Mac-F22C89C8 + dmi.modalias: dmi:bvnAppleInc.:bvrMB71.88Z.003F.B00.1802022149:bd02/02/18:svnAppleInc.:pnMacBook7,1:pvr1.0:rvnAppleInc.:rnMac-F22C89C8:rvr:cvnAppleInc.:ct10:cvrMac-F22C89C8: + dmi.product.family: MacBook + dmi.product.name: MacBook7,1 + dmi.product.version: 1.0 + dmi.sys.vendor: Apple Inc. ** Attachment added: "AlsaInfo.txt" https://bugs.launchpad.net/bugs/1915082/+attachment/5461451/+files/AlsaInfo.txt -- 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/1915082 Title: [Macbook7,1] backlight not working Status in linux package in Ubuntu: Confirmed Bug description: Backlight controls do not have any effect on a Macbook7,1 running Ubuntu 18.04. Ubuntu is installed in Legacy BIOS mode and uses the proprietary Nvidia drivers. The apple_backlight directory appears in /sys/class/backlight and while different brightness values can be set, they have no effect on the backlight's emitted brightness. The backlight remains at full brightness. I have tested the following kernel parameters but they have no effect. acpi_backlight=vendor video.use_bios_initial_backlight=0 acpi_osi= video.use_native_backlight=1 --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.23 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: jordan 1659 F.... pulseaudio CurrentDesktop: Pantheon DistroRelease: elementary OS 5.1.7 InstallationDate: Installed on 2021-01-30 (9 days ago) InstallationMedia: elementary OS 5.1 "hera" - stable amd64 (20200814) MachineType: Apple Inc. MacBook7,1 NonfreeKernelModules: nvidia wl Package: linux (not installed) ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-65-generic root=UUID=6cdd2f7b-d747-4fbc-8062-317304a148a6 ro rootflags=subvol=@ quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 5.4.0-65.73~18.04.1-generic 5.4.78 RelatedPackageVersions: linux-restricted-modules-5.4.0-65-generic N/A linux-backports-modules-5.4.0-65-generic N/A linux-firmware 1.173.19 Tags: hera Uname: Linux 5.4.0-65-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: sudo WifiSyslog: _MarkForUpload: True dmi.bios.date: 02/02/18 dmi.bios.vendor: Apple Inc. dmi.bios.version: MB71.88Z.003F.B00.1802022149 dmi.board.name: Mac-F22C89C8 dmi.board.vendor: Apple Inc. dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-F22C89C8 dmi.modalias: dmi:bvnAppleInc.:bvrMB71.88Z.003F.B00.1802022149:bd02/02/18:svnAppleInc.:pnMacBook7,1:pvr1.0:rvnAppleInc.:rnMac-F22C89C8:rvr:cvnAppleInc.:ct10:cvrMac-F22C89C8: dmi.product.family: MacBook dmi.product.name: MacBook7,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1915082/+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
