Public bug reported:
I just updated to Ubuntu 11.04 Beta to find that the backlight of my
monitor is off (or very low) and I can't turn it on.
The backlight intensity control never worked on any previous version of
Ubuntu (the Fn key controls responded, and changed a bar on screen, but
never really changed the backlight). The Fn key On/Off worked before. In
the new kernel, the backlight is off (or very low) by default and the
controls does not work, so I can't turn it on.
Now I am using the old 2.6.35-28-generic kernel to report this bug. I
hope enough info on the system has been gathered. My laptop is an
eMachines E725. lspci report the following about the video device:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 0212
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 50f0 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lucas 1822 F.... pulseaudio
/dev/snd/pcmC0D0p: lucas 1822 F...m pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xd6700000 irq 45'
Mixer name : 'Realtek ALC272X'
Components : 'HDA:10ec0272,10250212,00100001'
Controls : 15
Simple ctrls : 9
Date: Wed Apr 27 18:33:25 2011
HibernationDevice: RESUME=UUID=3e3ff916-ea57-411c-81e3-43861b6b198d
MachineType: eMachines eMachines E725
ProcEnviron:
LANGUAGE=pt_BR:en
LANG=pt_BR.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=2cdcad63-4a14-4e12-9cd4-bf10a0d49acd ro
locale=pt_BR quiet splash crashkernel=384M-2G:64M,2G-:128M
RelatedPackageVersions:
linux-restricted-modules-2.6.35-28-generic N/A
linux-backports-modules-2.6.35-28-generic N/A
linux-firmware 1.52
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-04-27 (0 days ago)
WpaSupplicantLog:
dmi.bios.date: 03/11/2009
dmi.bios.vendor: eMachines
dmi.bios.version: V1.03
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: eMachines E725
dmi.board.vendor: eMachines
dmi.board.version: V1.03
dmi.chassis.type: 1
dmi.chassis.vendor: eMachines
dmi.chassis.version: V1.03
dmi.modalias:
dmi:bvneMachines:bvrV1.03:bd03/11/2009:svneMachines:pneMachinesE725:pvrV1.03:rvneMachines:rneMachinesE725:rvrV1.03:cvneMachines:ct1:cvrV1.03:
dmi.product.name: eMachines E725
dmi.product.version: V1.03
dmi.sys.vendor: eMachines
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 natty running-unity
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https://bugs.launchpad.net/bugs/772050
Title:
My backlight is off
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