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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1747273
Title:
Can not control brightness on Thinkpad P51
Status in linux package in Ubuntu:
Confirmed
Bug description:
I can not modify the screen brightness in Ubuntu 17.10. Controls
aside, the classes in `proc` are either not available or non-
functional depending on what arguments I provide in
GRUB_CMDLINE_LINUX_DEFAULT.
On a parallel installation (Ubuntu 16.04.3), brightness control works
flawlessly.
System Information
------------------
$ lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10
$ lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05)
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 05)
00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA controller [AHCI mode] (rev 31)
00:1b.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Root Port #17 (rev f1)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Device a171 (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (5) I219-V (rev 31)
01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M1200 Mobile] (rev a2)
01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1)
02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961
04:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
3e:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961
# with GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux thinkpad-acpi.brightness_enable=1":
$ grep . -R /sys/class/backlight/thinkpad_screen/*
/sys/class/backlight/thinkpad_screen/actual_brightness:0
/sys/class/backlight/thinkpad_screen/bl_power:0
/sys/class/backlight/thinkpad_screen/brightness:11
/sys/class/backlight/thinkpad_screen/max_brightness:15
/sys/class/backlight/thinkpad_screen/power/runtime_active_kids:0
/sys/class/backlight/thinkpad_screen/power/runtime_suspended_time:0
grep: /sys/class/backlight/thinkpad_screen/power/autosuspend_delay_ms: Input/output error
/sys/class/backlight/thinkpad_screen/power/runtime_enabled:disabled
/sys/class/backlight/thinkpad_screen/power/runtime_active_time:0
/sys/class/backlight/thinkpad_screen/power/control:auto
/sys/class/backlight/thinkpad_screen/power/async:disabled
/sys/class/backlight/thinkpad_screen/power/runtime_usage:0
/sys/class/backlight/thinkpad_screen/power/runtime_status:unsupported
grep: warning: /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/subsystem: recursive directory loop
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_active_kids:0
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_suspended_time:0
grep: /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/autosuspend_delay_ms: Input/output error
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_enabled:disabled
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_active_time:0
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/control:auto
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/async:disabled
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_usage:0
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_status:unsupported
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/max_brightness:15
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/type:platform
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/brightness:11
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/bl_power:0
/sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/actual_brightness:0
/sys/class/backlight/thinkpad_screen/type:platform
3f:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
---
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: mhoff 2207 F.... pulseaudio
/dev/snd/pcmC0D0p: mhoff 2207 F...m pulseaudio
/dev/snd/controlC0: mhoff 2207 F.... pulseaudio
/dev/snd/controlC2: mhoff 2207 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 17.10
HibernationDevice: RESUME=UUID=5d843303-18a4-4466-b711-98668a4d1172
InstallationDate: Installed on 2017-11-11 (86 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: LENOVO 20HJS27B00
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-32-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro acpi_osi=Linux thinkpad-acpi.brightness_enable=1
ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
RelatedPackageVersions:
linux-restricted-modules-4.13.0-32-generic N/A
linux-backports-modules-4.13.0-32-generic N/A
linux-firmware 1.169.2
Tags: artful
Uname: Linux 4.13.0-32-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip disk libvirt lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/24/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1UET37W (1.11 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HJS27B00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1UET37W(1.11):bd07/24/2017:svnLENOVO:pn20HJS27B00:pvrThinkPadP51:rvnLENOVO:rn20HJS27B00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad P51
dmi.product.name: 20HJS27B00
dmi.product.version: ThinkPad P51
dmi.sys.vendor: LENOVO
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