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Message #72576
[Bug 1348020] Re: [Dell Latitude 3540] Unable to control brightness
Hello Anthony,
Does it means that for this kind of bug, they won't be fix in Trusty 14.04.
We have to wait for 14.04.2 (which will use 3.16 kernel)?
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https://bugs.launchpad.net/bugs/1348020
Title:
[Dell Latitude 3540] Unable to control brightness
Status in “linux” package in Ubuntu:
Fix Released
Bug description:
CIDL 201306-13866 Dell Latitude 3540
The brightness control does not work on this system
Steps:
1. Install 14.04 + update (3.13.0-32), boot to desktop
2. Try to change the brightness by using the hotkeys
3. Try to change the brightness by using the "Brightness and Lock" applet
Expect result:
* Brightness control works fine
Actual result:
* Brightness level indicator changes with the hotkey, but not the brightness.
* Brightness cannot be changed by the applet
Debugging information:
ubuntu@201306-13866:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
ubuntu@201306-13866:~$ grep -r . /proc/acpi
/proc/acpi/battery/BAT1/alarm:alarm: unsupported
/proc/acpi/battery/BAT1/state:present: yes
/proc/acpi/battery/BAT1/state:capacity state: ok
/proc/acpi/battery/BAT1/state:charging state: charged
/proc/acpi/battery/BAT1/state:present rate: 1 mA
/proc/acpi/battery/BAT1/state:remaining capacity: 5900 mAh
/proc/acpi/battery/BAT1/state:present voltage: 12972 mV
/proc/acpi/battery/BAT1/info:present: yes
/proc/acpi/battery/BAT1/info:design capacity: 5900 mAh
/proc/acpi/battery/BAT1/info:last full capacity: 5900 mAh
/proc/acpi/battery/BAT1/info:battery technology: rechargeable
/proc/acpi/battery/BAT1/info:design voltage: 11100 mV
/proc/acpi/battery/BAT1/info:design capacity warning: 590 mAh
/proc/acpi/battery/BAT1/info:design capacity low: 177 mAh
/proc/acpi/battery/BAT1/info:cycle count: 0
/proc/acpi/battery/BAT1/info:capacity granularity 1: 264 mAh
/proc/acpi/battery/BAT1/info:capacity granularity 2: 3780 mAh
/proc/acpi/battery/BAT1/info:model number: DELL G019Y35H
/proc/acpi/battery/BAT1/info:serial number: 0C45
/proc/acpi/battery/BAT1/info:battery type: Li-Ion
/proc/acpi/battery/BAT1/info:OEM info: SDI
/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:LID0 S3 *enabled
/proc/acpi/wakeup:EHC1 S0 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:XHC S0 *enabled pci:0000:00:14.0
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP03 S3 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PEG0 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:PEG1 S4 *disabled
/proc/acpi/wakeup:PEG2 S4 *disabled
ubuntu@201306-13866:~$ dmesg | grep 'ACPI: Video'
[ 11.036337] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 1586 F.... pulseaudio
CRDA:
country TW:
(2402 - 2472 @ 40), (3, 27)
(5270 - 5330 @ 40), (3, 17), DFS
(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Wed Jul 23 23:35:09 2014
HibernationDevice: RESUME=UUID=bce2a764-eac9-4044-b879-caa497463b91
InstallationDate: Installed on 2014-07-24 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. Latitude 3540
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=1dd2f74b-d1f1-42e1-9c35-6675a578b71e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-32-generic N/A
linux-backports-modules-3.13.0-32-generic N/A
linux-firmware 1.127.5
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/06/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0992HC
dmi.board.vendor: Dell Inc.
dmi.board.version: X01
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A01
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd08/06/2013:svnDellInc.:pnLatitude3540:pvrA01:rvnDellInc.:rn0992HC:rvrX01:cvnDellInc.:ct8:cvrA01:
dmi.product.name: Latitude 3540
dmi.product.version: A01
dmi.sys.vendor: Dell Inc.
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