I have a sony vaio vpcs136fg laptop. what ever i've done, i was not able to change my laptop brightness. even setpci do not change the laptop brightness. the graphic card is NVIDIA GT218M [GeForce 310M] (rev a2) and it's pci configuration space dump is listed below:
Notes:
1. the brightness is locked @ maximum.
2. changing /sys/class/acpi_video0/brightness does not affect the brightness
3. using xbacklight does not change the brightness
4. passing kernel parameters does not change brightness
Probable problem:
Lately before I install Linux, I was using windows 7 with sony care center application on it. sony care center has an option called Auto Brightness. as long as that option was turned on, windows could not change the brightness and everything controlled under that option. When I installed linux, that option was enabled in windows. It might cause of the mess here. I don't want to change the OS to try if it is the problem or not (cause I repartitioned my hard drive and I really don't want to see that Microsoft Logo again)
Note:
I tried vaio forums but there was no answer.
I tried GeForce forum, but there was no answer.
thanx in advanceCode:01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [GeForce 310M] (rev a2) 00: de 10 75 0a 07 00 10 00 a2 00 00 03 00 00 80 00 10: 00 00 00 d2 0c 00 00 c0 00 00 00 00 0c 00 00 d0 20: 00 00 00 00 01 70 00 00 00 00 00 00 4d 10 69 90 30: 00 00 00 00 60 00 00 00 00 00 00 00 07 01 00 00 40: 4d 10 69 90 00 00 00 00 00 00 00 00 00 00 00 00 50: 01 00 00 00 01 00 00 00 ce d6 23 00 00 00 00 00 60: 01 68 03 00 08 00 00 00 05 78 80 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 10 b4 02 00 e0 8d 2c 01 80: 10 29 00 00 02 2d 05 00 4b 01 11 10 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 a0: 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 b0: 00 00 00 00 09 00 14 01 00 00 00 00 00 0c 03 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 100: 02 00 81 12 00 00 00 00 00 00 00 00 00 00 00 00 110: 00 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