Comment 57 for bug 573984

User-Agent: Opera/9.80 (X11; Linux x86_64; U; nl) Presto/2.8.131 Version/11.10

Hot keys for adjusting screen brightness do not work.

External bug reports that describe the same problem:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/573984
https://bugs.freedesktop.org/show_bug.cgi?id=33287
Same problem with other Intel card: https://bugzilla.novell.com/show_bug.cgi?id=675241

I have been trying a lot of different settings as described in above bug reports, but nothing works for me.
My laptop: MEDION® AKOYA® P6624 (MD 98390)
http://aldi.medion.com/md98390/au/

# hwinfo --gfxcard
10: PCI 02.0: 0300 VGA compatible controller (VGA)
  [Created at pci.318]
  Unique ID: _Znp.iyzBTZJDe1C
  SysFS ID: /devices/pci0000:00/0000:00:02.0
  SysFS BusID: 0000:00:02.0
  Hardware Class: graphics card
  Model: "Intel Arrandale Integrated Graphics Controller"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x0046 "Arrandale Integrated Graphics Controller"
  SubVendor: pci 0x17c0 "Wistron Corp."
  SubDevice: pci 0x10e2
  Revision: 0x18
  Driver: "i915"
  Driver Modules: "drm"
  Memory Range: 0xfb400000-0xfb7fffff (rw,non-prefetchable)
  Memory Range: 0xd0000000-0xdfffffff (ro,non-prefetchable)
  I/O Ports: 0xf080-0xf087 (rw)
  IRQ: 51 (101824 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v00008086d00000046sv000017C0sd000010E2bc03sc00i00"
  Config Status: cfg=no, avail=yes, need=no, active=unknown

24: PCI 100.0: 0300 VGA compatible controller (VGA)
  [Created at pci.318]
  Unique ID: VCu0.yi5X9OZqOOE
  Parent ID: vSkL.2z28zifqwu6
  SysFS ID: /devices/pci0000:00/0000:00:01.0/0000:01:00.0
  SysFS BusID: 0000:01:00.0
  Hardware Class: graphics card
  Model: "nVidia VGA compatible controller"
  Vendor: pci 0x10de "nVidia Corporation"
  Device: pci 0x0df0
  SubVendor: pci 0x17c0 "Wistron Corp."
  SubDevice: pci 0x10e2
  Revision: 0xa1
  Memory Range: 0xfa000000-0xfaffffff (rw,non-prefetchable,disabled)
  Memory Range: 0xe0000000-0xefffffff (ro,non-prefetchable,disabled)
  Memory Range: 0xf0000000-0xf1ffffff (ro,non-prefetchable,disabled)
  I/O Ports: 0xe000-0xefff (rw,disabled)
  Memory Range: 0xfb000000-0xfb07ffff (ro,non-prefetchable,disabled)
  IRQ: 16 (1553 events)
  Module Alias: "pci:v000010DEd00000DF0sv000017C0sd000010E2bc03sc00i00"
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #9 (PCI bridge)

Primary display adapter: #10

# uname -a
Linux pcj.site 2.6.38.6-26-desktop #1 SMP PREEMPT 2011-05-10 12:19:59 +0200
x86_64 x86_64 x86_64 GNU/Linux

> xbacklight -get
11.111111
> xbacklight -set 40
> xbacklight -get
33.333333

But nothing actually happens.

I am only using the Intel graphics driver. Because I have been trying a lot of settings, X didn't start anymore. Removing the nvidia drivers (nvidia/nouveau) solved it.

Reproducible: Always

Steps to Reproduce:
1. Try to change the screen resolution with Fn key combination
2. Try to use the brightness slider
3. Try to use xbacklight

Actual Results:
The Brightness does not change in any way.

Expected Results:
A gradual change in screen brightness should be the result of using at least
xbacklight.

Screen brightness seems to be at 100% after boot.