[Intel-gfx] lcd brightness problem

[Olaf Ruppert]

Hello,

I have an Intel GM5 board.   I can't adjust the brightness of the lcd panel.
I tried kernel Version 2.6.26-2-686 and the intel drm-next kernel.
Am I doing something wrong, or is adjustment of brightness not
supported by by the intel driver?

Thanks in a advance,

Olaf



# xrandr --prop
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 1920 x 1920
VGA connected 1280x800+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x800       60.0*
   1280x768       60.0
   1024x768       60.0
   800x600        60.3
   640x480        59.9
LVDS connected 1920x1080+0+0 (normal left inverted right x axis y
axis) 0mm x 0mm
        PANEL_FITTING: full
                supported: center       full_aspect  full
        BACKLIGHT_CONTROL: combination
                supported: native       legacy       combination  kernel
        BACKLIGHT: 6250 (0x0000186a) range:  (0,6250)
   1920x1080      64.1*+
   1680x1050      60.0
   1600x1024      60.0
   1400x1050      85.3     74.8     70.0     60.0
   1280x1024      85.0     75.0     60.0
   1440x900       60.2
   1280x960       85.0     60.0
   1280x800       60.0
   1152x864       85.1     75.0
   1280x768       60.0
   1152x768       54.8
   1024x768       85.0     75.0     70.1     60.0
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     59.9
   720x400        85.0
   640x400        85.1
   640x350        85.1
TV disconnected (normal left inverted right x axis y axis)
        BOTTOM: 37 (0x00000025) range:  (0,100)
        RIGHT: 46 (0x0000002e) range:  (0,100)
        TOP: 36 (0x00000024) range:  (0,100)
        LEFT: 54 (0x00000036) range:  (0,100)
        TV_FORMAT: NTSC-M
                supported: NTSC-M       NTSC-443     NTSC-J       PAL-M
                           PAL-N        PAL

# ls -l /sys/class/backlight/
total 0

# setpci -s 00:02.1 F4.B=ff
# no effect

# lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network
Connection (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2
EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 4 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB
UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2
EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
00:1f.2 IDE interface: Intel Corporation ICH9M/M-E 2 port SATA IDE
Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
00:1f.5 IDE interface: Intel Corporation ICH9M/M-E 2 port SATA IDE
Controller (rev 03)
01:00.0 IDE interface: JMicron Technologies, Inc. JMB368 IDE controller
02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection