Running Ubuntu 11.04 on Lenovo ThinkPad with an Nvida graphics card. The unit goes to sleep when the lid is shut. (The unit goes to suspend mode (not to disk/hibernate), AC gets turned off, running on battery) Upon lid-open sometimes the screen is almost too dark to read. I'm really not sure of the exact cause, (very low batt??). The only fix is a reboot. The screen brightness buttons have never worked in Ubuntu.

I have messed w/ the power management preferences. No change. At one point I messed w/ the gnome settings. No change.

I have tried a few cmds:

echo 9>/sys/class/backlight/acpi_video0/brightness
setpci -s 00:02.0 F4.B=10
xgamma -gamma .75

None of these help. Most have zero effect.

I think it is and acpi thing, but that is just a guess. I'm out of idea's, and looking for suggestions. Thanks