Dark screen when wake / Unable to control screen brightness
- by John
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