Public bug reported:
Brightness disappear, no entries in /sys/class/backlight
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-40-generic 5.3.0-40.32
ProcVersionSignature: Ubuntu 5.3.0-40.32-generic 5.3.18
Uname: Linux 5.3.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: brian 1822 F.... pulseaudio
/dev/snd/controlC1: brian 1822 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Thu Mar 12 03:10:15 2020
InstallationDate: Installed on 2020-03-10 (1 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64
(20200203.1)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 04f3:0c03 Elan Microelectronics Corp. ELAN:Fingerprint
Bus 001 Device 002: ID 0408:a060 Quanta Computer, Inc. HD WebCam
Bus 001 Device 004: ID 8087:0aaa Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire A715-72G
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-40-generic
root=UUID=405a07bf-f671-40e7-984b-b478fb7b70e3 ro quiet splash nomodeset
acpi_backlight=video vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.3.0-40-generic N/A
linux-backports-modules-5.3.0-40-generic N/A
linux-firmware 1.183.4
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/05/2019
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.28
dmi.board.asset.tag: Type2 - Board Serial Number
dmi.board.name: Charmeleon_CFS
dmi.board.vendor: CFL
dmi.board.version: V1.28
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.28
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.28:bd08/05/2019:svnAcer:pnAspireA715-72G:pvrV1.28:rvnCFL:rnCharmeleon_CFS:rvrV1.28:cvnAcer:ct10:cvrV1.28:
dmi.product.family: Aspire 7
dmi.product.name: Aspire A715-72G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.28
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug eoan
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https://bugs.launchpad.net/bugs/1867060
Title:
brightness
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