Thanks for the bug report. Please try updating to the latest kernel version 5.11 and tell us if it still has the same problem:
sudo apt update sudo apt install linux-generic-hwe-20.04 sudo apt full-upgrade and reboot. ** Summary changed: - Display Brightness not working + [HP Spectre x360 Convertible 15-eb0xxx] Display Brightness not working ** Package changed: xorg (Ubuntu) => linux-hwe-5.8 (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.8 in Ubuntu. https://bugs.launchpad.net/bugs/1940850 Title: [HP Spectre x360 Convertible 15-eb0xxx] Display Brightness not working Status in linux-hwe-5.8 package in Ubuntu: New Bug description: Slot: 00:02.0 Class: VGA compatible controller [0300] Vendor: Intel Corporation [8086] Device: UHD Graphics [9bc4] SVendor: Hewlett-Packard Company [103c] SDevice: Device [86e8] Rev: 05 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-43-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.18 Architecture: amd64 CasperMD5CheckResult: skip CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None Date: Mon Aug 23 19:12:04 2021 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation UHD Graphics [8086:9bc4] (rev 05) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:86e8] NVIDIA Corporation Device [10de:1f95] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:86e8] InstallationDate: Installed on 2021-08-17 (6 days ago) InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1) MachineType: HP HP Spectre x360 Convertible 15-eb0xxx ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-43-generic root=UUID=d4933395-f795-4cde-b7b1-17a98f03fcd1 ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/01/2021 dmi.bios.release: 15.11 dmi.bios.vendor: AMI dmi.bios.version: F.11 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 86E8 dmi.board.vendor: HP dmi.board.version: 01.77 dmi.chassis.type: 31 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.ec.firmware.release: 1.77 dmi.modalias: dmi:bvnAMI:bvrF.11:bd02/01/2021:br15.11:efr1.77:svnHP:pnHPSpectrex360Convertible15-eb0xxx:pvr:rvnHP:rn86E8:rvr01.77:cvnHP:ct31:cvrChassisVersion: dmi.product.family: 103C_5335KV HP Spectre dmi.product.name: HP Spectre x360 Convertible 15-eb0xxx dmi.product.sku: 9GB30UA#ABA dmi.sys.vendor: HP version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.105-3~20.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.3-0ubuntu0.3~20.04.1 version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1~20.04.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.8/+bug/1940850/+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
