Public bug reported:
CID: 201406-15271 Dell Latitude E5550
Brightness control does not work on this system
The brightness level indicator would change with hotkey events, but the
brightness itself does not.
Debugging information:
ubuntu@201406-15271:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
ubuntu@201406-15271:~$ 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: discharging
/proc/acpi/battery/BAT0/state:present rate: 772 mA
/proc/acpi/battery/BAT0/state:remaining capacity: 3170 mAh
/proc/acpi/battery/BAT0/state:present voltage: 12493 mV
/proc/acpi/battery/BAT0/info:present: yes
/proc/acpi/battery/BAT0/info:design capacity: 3540 mAh
/proc/acpi/battery/BAT0/info:last full capacity: 3372 mAh
/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: 354 mAh
/proc/acpi/battery/BAT0/info:design capacity low: 107 mAh
/proc/acpi/battery/BAT0/info:cycle count: 0
/proc/acpi/battery/BAT0/info:capacity granularity 1: 35 mAh
/proc/acpi/battery/BAT0/info:capacity granularity 2: 35 mAh
/proc/acpi/battery/BAT0/info:model number: DELL 9P4D246
/proc/acpi/battery/BAT0/info:serial number: 226
/proc/acpi/battery/BAT0/info:battery type: LiP
/proc/acpi/battery/BAT0/info:OEM info: LGC-LGC3.4
/proc/acpi/button/lid/LID0/state:state: open
/proc/acpi/ac_adapter/AC/state:state: off-line
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:PEG0 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:PEG1 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:PEG2 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:01:00.0
/proc/acpi/wakeup:RP02 S4 *disabled
/proc/acpi/wakeup:PXSX S4 *disabled
/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 *disabled pci:0000:02:00.0
/proc/acpi/wakeup:RP05 S4 *disabled pci:0000:00:1c.4
/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:GLAN S4 *disabled pci:0000:00:19.0
/proc/acpi/wakeup:EHC1 S0 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:EHC2 S0 *disabled
/proc/acpi/wakeup:XHC S0 *enabled pci:0000:00:14.0
/proc/acpi/wakeup:HDEF S4 *disabled pci:0000:00:1b.0
/proc/acpi/wakeup:LID0 S3 *enabled
/proc/acpi/wakeup:PBTN S3 *enabled
ubuntu@201406-15271:~$ dmesg | grep 'ACPI: Video'
[ 12.986933] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
ubuntu@201406-15271:~$
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-37-generic 3.13.0-37.64
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 1530 F.... pulseaudio
/dev/snd/controlC1: ubuntu 1530 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Oct 15 23:03:45 2014
HibernationDevice: RESUME=UUID=02cbc1f1-a261-484c-8fc2-05b68f73446d
InstallationDate: Installed on 2014-10-09 (6 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Latitude E5550
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic
root=UUID=d3b20ae5-9ff8-49b3-b640-1c6a9f264710 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-37-generic N/A
linux-backports-modules-3.13.0-37-generic N/A
linux-firmware 1.127.7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/25/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: T43
dmi.board.name: 0141B2
dmi.board.vendor: Dell Inc.
dmi.board.version: X02
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrT43:bd07/25/2014:svnDellInc.:pnLatitudeE5550:pvr01:rvnDellInc.:rn0141B2:rvrX02:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5550
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Anthony Wong (anthonywong)
Status: Confirmed
** Tags: 201406-15271 amd64 apport-bug blocks-hwcert taipei-lab trusty
** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/bugs/1381851/+attachment/4237814/+files/dmidecode.log
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https://bugs.launchpad.net/bugs/1381851
Title:
[Dell Latitude E5550] Brightness control does not work on this system
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