** Changed in: linux-lts-trusty (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1353307
Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
Status in HWE Next:
Won't Fix
Status in linux-lts-trusty package in Ubuntu:
Won't Fix
Bug description:
CID: 201208-11587 Lenovo B470e
This system was certified with 12.04.2
http://www.ubuntu.com/certification/hardware/201208-11587/
However, brightness control does not work on this system anymore.
The brightness level indicator would change with hotkey events, but
brightness itself does not.
(This is an Intel UMA system)
This issue could be found on many other Dell laptops as well
ubuntu@201208-11587:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
ubuntu@201208-11587:~$ grep -r . /proc/acpi
/proc/acpi/battery/BAT0/alarm:alarm: unsupported
/proc/acpi/battery/BAT0/state:present: yes
/proc/acpi/battery/BAT0/state:capacity state: ok
/proc/acpi/battery/BAT0/state:charging state: charged
/proc/acpi/battery/BAT0/state:present rate: 0 mW
/proc/acpi/battery/BAT0/state:remaining capacity: 44460 mWh
/proc/acpi/battery/BAT0/state:present voltage: 11373 mV
/proc/acpi/battery/BAT0/info:present: yes
/proc/acpi/battery/BAT0/info:design capacity: 48840 mWh
/proc/acpi/battery/BAT0/info:last full capacity: 48560 mWh
/proc/acpi/battery/BAT0/info:battery technology: rechargeable
/proc/acpi/battery/BAT0/info:design voltage: 11100 mV
/proc/acpi/battery/BAT0/info:design capacity warning: 3395 mWh
/proc/acpi/battery/BAT0/info:design capacity low: 1697 mWh
/proc/acpi/battery/BAT0/info:cycle count: 0
/proc/acpi/battery/BAT0/info:capacity granularity 1: 1698 mWh
/proc/acpi/battery/BAT0/info:capacity granularity 2: 45165 mWh
/proc/acpi/battery/BAT0/info:model number: L09M6Y02
/proc/acpi/battery/BAT0/info:serial number: 601
/proc/acpi/battery/BAT0/info:battery type: LION
/proc/acpi/battery/BAT0/info:OEM info: SMP
/proc/acpi/button/lid/LID0/state:state: open
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:P0P1 S4 *disabled
/proc/acpi/wakeup:GLAN S4 *disabled
/proc/acpi/wakeup:EHC1 S3 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:EHC2 S3 *enabled pci:0000:00:1a.0
/proc/acpi/wakeup:HDEF S4 *disabled pci:0000:00:1b.0
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:RP02 S4 *disabled pci:0000:00:1c.1
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:02:00.0
/proc/acpi/wakeup:RP03 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP04 S4 *disabled pci:0000:00:1c.3
/proc/acpi/wakeup:PXSX S4 *enabled pci:0000:03:00.0
/proc/acpi/wakeup:RP05 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP06 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP07 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP08 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:PEG0 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:PEG1 S4 *disabled
/proc/acpi/wakeup:PEG2 S4 *disabled
/proc/acpi/wakeup:PEG3 S4 *disabled
/proc/acpi/wakeup:LID0 S3 *enabled
/proc/acpi/wakeup:SLPB S3 *enabled
ubuntu@201208-11587:~$ dmesg | grep 'ACPI: Video'
ubuntu@201208-11587:~$
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57~precise1 [modified:
boot/vmlinuz-3.13.0-32-generic]
ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Wed Aug 6 03:01:29 2014
InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64
(20140801)
MarkForUpload: True
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-lts-trusty
UpgradeStatus: No upgrade log present (probably fresh install)
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