Public bug reported:
HP EliteBook 725 G2 Notebook PC
(CID 201405-15214)
updated Ubuntu 14.04.1
3.13.0-43-generic #72
Steps to reproduce the bug:
1. install 12.04.3 on this machine
2. update the system via update manager to make the system up-to-date
3. click the upper-right indicator to launch the "System settings -> Brightness
and Lock" applet
4. try to adjust the brightness slider to control the brightness
5. try to adjust the brightness by the function key fn+F8 or fn+F9
Expected result:
The brightness could be adjusted
Actual result:
screen brightness has no response
More information:
brightness has no response by using this command:
echo 4 | sudo tee -a /sys/class/backlight/acpi_video0/brightness
brightness HAS response by using this command:
echo 4 | sudo tee -a /sys/class/backlight/radeon_bl0/brightness
------------------------
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-43-generic 3.13.0-43.72
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 1417 F.... pulseaudio
/dev/snd/controlC0: ubuntu 1417 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jan 12 02:50:55 2015
HibernationDevice: RESUME=UUID=e24b803a-e217-4d6d-a35c-dbe0c033966a
InstallationDate: Installed on 2015-01-08 (3 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: Hewlett-Packard HP Licrice
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic
root=UUID=c1e0a265-8c75-4427-ad25-f0c76f003ce7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-43-generic N/A
linux-backports-modules-3.13.0-43-generic N/A
linux-firmware 1.127.11
RfKill:
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/03/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M84 Ver. 97.35
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 221D
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 63.14
dmi.chassis.asset.tag: 73612P10CU
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias:
dmi:bvnHewlett-Packard:bvrM84Ver.97.35:bd09/03/2014:svnHewlett-Packard:pnHPLicrice:pvrA3009CD10002:rvnHewlett-Packard:rn221D:rvrKBCVersion63.14:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Licrice
dmi.product.version: A3009CD10002
dmi.sys.vendor: Hewlett-Packard
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: 201405-15214 amd64 apport-bug blocks-hwcert taipei-lab trusty
** Also affects: hwe-next
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1409625
Title:
[HP EliteBook 725 G2 Notebook PC] brightness could not be controlled
by the function key and the slider of "System settings -> Brightness
and Lock" but sysfs works
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