I can increase and decrease brightness on my Eee PC netbook. GMA3150 driver version is 22.214.171.1247 which is latest.
Btw I think N220 panel supports upto 1024 X 600 but not sure.
I had no trouble running my N220 on 1024 X 768 prior to the update installation.
I'll try other GMA3150 versions.
I have a Samsung N150 with N450 and GMA 3150. Withe the latest drivers I can no longer change my screen's brightness, which remains fixed to maximum.
I run Windows 7 x64. Samsung provides only x32 drivers (really poor service from Samsung!). I downloaded the x64 drivers from the Intel site.
The most recent driver version which allows controlling the Brightness is 126.96.36.199.1972. Any newer driver version will break this important functionality.
This is a very well know problem which applied to the newest drivers versions for both x32 and x64 Windows 7 (and I saw also reports around Vista). The problem is discussed in several forums (in particular Samsung), but neither Samsung nor Intel seem to be acknowledgin or doing anything about it.
Now this forum looks to be the only way Intel provide to contact their support (AGAIN, VERY POOR FROM INTEL!!!!).
IS ANY INTEL ENGINEER READING THIS???? CAN YOU GET BACK TO THE COMMUNITY AND PROVIDE US WITH A WORKING DRIVER!!!!!!