OK, I've got an X230 where this works for me on 4.4 and 4.8, so if it's
being handled by the ACPI driver then we may have some weird ACPI issue
going on. Can you dump the acpi tables so I can sanity check these to
see what is different from your X230 and mine?
Please install acpica-tools and run:
sudo acpidump > acpidump-x230.log
and attach that to the bug report
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1626429
Title:
[4.8 regression][ThinkPad X230] brightness change keys do not work any
more
Status in linux package in Ubuntu:
Confirmed
Bug description:
With yakkety's recent update from linux 4.4 to 4.8 my brightness keys
stopped working. They are not handled in software via evdev events (on
most platforms you just get a KEY_BRIGHTNESS{UP<DOWN}), but are
hardwired in the kernel driver.
With both 4.4 and 4.8 dmesg shows:
[ 10.114072] thinkpad_acpi: This ThinkPad has standard ACPI backlight
brightness control, supported by the ACPI video driver
[ 10.114073] thinkpad_acpi: Disabling thinkpad-acpi brightness events by
default...
In 4.4 I have these two devices in /sys:
/sys/class/backlight/acpi_video0/:
-r--r--r-- 1 root root 4096 Sep 22 09:45 actual_brightness
-rw-r--r-- 1 root root 4096 Sep 22 09:45 bl_power
-rw-r--r-- 1 root root 4096 Sep 22 09:45 brightness
lrwxrwxrwx 1 root root 0 Sep 22 09:45 device -> ../../../0000:00:02.0
-r--r--r-- 1 root root 4096 Sep 22 09:45 max_brightness
drwxr-xr-x 2 root root 0 Sep 22 09:45 power
lrwxrwxrwx 1 root root 0 Sep 22 09:45 subsystem ->
../../../../../class/backlight
-r--r--r-- 1 root root 4096 Sep 22 09:45 type
-rw-r--r-- 1 root root 4096 Sep 22 09:45 uevent
/sys/class/backlight/intel_backlight/:
-r--r--r-- 1 root root 4096 Sep 22 09:46 actual_brightness
-rw-r--r-- 1 root root 4096 Sep 22 09:46 bl_power
-rw-r--r-- 1 root root 4096 Sep 22 09:46 brightness
lrwxrwxrwx 1 root root 0 Sep 22 09:46 device -> ../../card0-LVDS-1
-r--r--r-- 1 root root 4096 Sep 22 09:46 max_brightness
drwxr-xr-x 2 root root 0 Sep 22 09:46 power
lrwxrwxrwx 1 root root 0 Sep 22 09:46 subsystem ->
../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 Sep 22 09:46 type
-rw-r--r-- 1 root root 4096 Sep 22 09:46 uevent
While in 4.8 I only have intel_backlight and acpi_video0 is missing
completely.
I. e. in 4.4 this command works:
echo 12 | sudo tee /sys/class/backlight/acpi_video0/brightness
and I suppose this is the moral equivalent of what happens when I
press the brightness keys, i. e. these keys seem to be handled by the
acpi_video0 driver instead of intel_backlight.
The intel driver still actually works, I can do
echo 1000 | sudo tee /sys/class/backlight/intel_backlight/brightness
but this isn't connected to the keys any more.
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-11-generic 4.8.0-11.12
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Uname: Linux 4.8.0-11-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0c: martin 3049 F...m pulseaudio
/dev/snd/pcmC0D0p: martin 3049 F...m pulseaudio
/dev/snd/controlC0: martin 3049 F.... pulseaudio
Date: Thu Sep 22 09:42:56 2016
EcryptfsInUse: Yes
MachineType: LENOVO 2324CTO
ProcEnviron:
TERM=linux
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.8.0-11-generic.efi.signed
root=UUID=f86539b0-3a1b-4372-83b0-acdd029ade68 ro rootflags=subvol=@
systemd.debug-shell
RelatedPackageVersions:
linux-restricted-modules-4.8.0-11-generic N/A
linux-backports-modules-4.8.0-11-generic N/A
linux-firmware 1.161
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/09/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET95WW (2.55 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2324CTO
dmi.board.vendor: LENOVO
dmi.board.version: 0B98401 Pro
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrG2ET95WW(2.55):bd07/09/2013:svnLENOVO:pn2324CTO:pvrThinkPadX230:rvnLENOVO:rn2324CTO:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2324CTO
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO
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