Unable to control display brightness

[Vinay Vasista]

Hi,

I had hard rebooted my laptop after I found out that Ubuntu 18.04 was not responding to login credentials. But this reboot was not successful for some reason and I saw a few error messages. So I rebooted in recovery mode, and finally after recovery was done, I selected continue to normal boot. Since then, I'm not able to control the brightness of my screen. Please let me know what additional information or log files you would need to figure out the cause, and solve this problem for me.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-66-generic 4.15.0-66.75
ProcVersionSignature: Ubuntu 4.15.0-66.75-generic 4.15.18
Uname: Linux 4.15.0-66-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: bane 5071 F.... pulseaudio
 /dev/snd/controlC0: bane 5071 F.... pulseaudio
CRDA:
 global
 country IN: DFS-UNSET
  (2402 - 2482 @ 40), (N/A, 20), (N/A)
  (5150 - 5350 @ 160), (N/A, 23), (N/A)
  (5725 - 5875 @ 80), (N/A, 23), (N/A)
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 7 18:31:57 2019
HibernationDevice: RESUME=UUID=2db48228-3d47-4e07-a5a9-261e53c366b4
InstallationDate: Installed on 2019-01-24 (286 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: Dell Inc. G3 3579
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-66-generic root=UUID=777c1fb9-e93b-42ef-9910-cee1f24a68d6 ro recovery nomodeset
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-66-generic N/A
 linux-backports-modules-4.15.0-66-generic N/A
 linux-firmware 1.173.9
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/18/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.1
dmi.board.name: 03TF0Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.2.1:bd07/18/2018:svnDellInc.:pnG33579:pvr:rvnDellInc.:rn03TF0Y:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: GSeries
dmi.product.name: G3 3579
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Kai-Heng Feng (kaihengfeng)]

Please try LTS enablement stack:
https://wiki.ubuntu.com/Kernel/LTSEnablementStack