Comment 12 for bug 551668

I have a Sony Vaio CW2 laptop, with an Nvidia GeForce 310M card. I am using the nouveau driver from git (via the xorg-edgers ubuntu repository). I have to say it works really well - I even get desktop effects in KDE with Gallium.

However, there is one problem with screen brightness. The max_brightness value for the backlight interface (/sys/class/backlight/nv_backlight/max_brightness) is set to 1025. When I use KDE power-devil (or any brightness control tool), it reduces the brightness by tiny fractions, which still keeps the screen at full brightness. The brightness actually varies only between 0 and 127 (128-1025 are full brightness), and then too only if I change it in increments of 10 or 20. I think ideally the max_brightness value should be 7 (or 10?) and it should vary in steps of 1.