Hello. For unknown reasons, the brightness up and brightness down keys on my ProBook 455 G5 are being mapped to F20, which is the microphone mute key. Because of this, the screen brightness cannot be adjusted by pressing the brightness keys. However, the screen brightness can still be adjusted by software such as panel applets.
I did a fair amount of testing to arrive at this conclusion. acpi_listen reports the brightness keys as F20, same with my microphone mute key. showkey reveals that the scan codes are identical for both the brightness keys and the microphone mute key. On the off-chance it was some kind of userspace issue, I also performed these tests from other distributions, both systemd and non-systemd variants. The same issue is present there as well.
The only conclusion I am left with is that the kernel is not reporting the keys correctly. I haven't been able to find any other reports of a similar situation, so I am unsure how to proceed from here. Please advise me on how I can help you find a solution to my issue. Thank you.
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ryuo 3305 F.... pulseaudio
/dev/snd/controlC0: ryuo 3305 F.... pulseaudio
CurrentDesktop: MATE
DistroRelease: Ubuntu 18.04
MachineType: HP HP ProBook 455 G5
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: linux (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/root@/boot/vmlinuz-4.15.0-29-generic root=ZFS=username-laptop:0/root ro quiet splash elevator=noop
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-29-generic N/A
linux-backports-modules-4.15.0-29-generic N/A
linux-firmware 1.173.1
StagingDrivers: r8822be
Tags: bionic staging
Uname: Linux 4.15.0-29-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: kvm sudo
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 03/30/2018
dmi.bios.vendor: HP
dmi.bios.version: Q84 Ver. 01.01.01
dmi.board.name: 836E
dmi.board.vendor: HP
dmi.board.version: KBC Version 03.16.00
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrQ84Ver.01.01.01:bd03/30/2018:svnHP:pnHPProBook455G5:pvr:rvnHP:rn836E:rvrKBCVersion03.16.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP ProBook
dmi.product.name: HP ProBook 455 G5
dmi.sys.vendor: HP
apport information