I came across a suggestion to a brightness issue on a different machine
that was fixed by setting GRUB_CMDLINE_LINUX="" to
GRUB_CMDLINE_LINUX="acpi_os_name="Microsoft Windows XP"". Apparently
fooling the bios into thinking its running Windows frees up more
facilities including control of brightness.
To make the adjustment to Grub, go to a terminal, sudo gedit
etc/default/grub will put the grub file into gedit, find the line and
edit it and save. Then in the terminal sudo update-grub.
Not yet tried it because I need more time in case I lose my screen
again! But someone else might want to.
Some more details of my set up below. (Note I currently have acpi off as
part of a different more complex fix and hope to be able to get it back
on to stop my laptop overheating and running the battery down in 10
minutes!)
ian@ian-HP-G62-Notebook-PC:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic
root=UUID=9ed9a092-9789-4941-adb9-7bfc021fc975 ro quiet splash text
acpi_osi=linux acpi=off vt.handoff=7
ian@ian-HP-G62-Notebook-PC:~$ ls /sys/class/backlight/*/
actual_brightness brightness max_brightness subsystem uevent
bl_power device power type
ian@ian-HP-G62-Notebook-PC:~$ sudo lspci -vnn | grep -A10 VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company Device [103c:1439]
Flags: bus master, fast devsel, latency 0, IRQ 19
Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
Memory at a0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3050 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-settings-daemon in Ubuntu.
https://bugs.launchpad.net/bugs/873191
Title:
Ubuntu starts with lowest brightness on HP G62[regression]
Status in “gnome-settings-daemon” package in Ubuntu:
Confirmed
Bug description:
Ubuntu Oneiric starts with the lowest brightness value by default
(even if AC powered) on HP G62. This is a regressions since Ubuntu
Natty.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
CompizPlugins:
[core,bailer,detection,composite,opengl,decor,imgpng,compiztoolbox,unitymtgrabhandles,regex,mousepoll,vpswitch,place,resize,snap,gnomecompat,move,session,grid,wall,animation,workarounds,expo,fade,ezoom,scale,unityshell]
CompositorRunning: None
Date: Thu Oct 13 09:35:42 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
Intel Corporation Core Processor Integrated Graphics Controller [8086:0046]
(rev 02) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:143a]
ATI Technologies Inc Manhattan [Mobility Radeon HD 5400 Series] [1002:68e0]
(prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:143a]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
MachineType: Hewlett-Packard HP G62 Notebook PC
ProcEnviron:
PATH=(custom, user)
LANG=es_ES.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic
root=UUID=fedf2154-36ec-408f-bb55-744752f19c8e ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/29/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.37
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 143A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 60.3F
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnHewlett-Packard:bvrF.37:bd10/29/2010:svnHewlett-Packard:pnHPG62NotebookPC:pvr0594110000252710001020100:rvnHewlett-Packard:rn143A:rvr60.3F:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP G62 Notebook PC
dmi.product.version: 0594110000252710001020100
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:0.0.16+git20110411+8378443-1
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