I've been having a problem with the back light on my T61p (T7500), after a text terminal (runlevel 3) screen blank (stand by, not suspend?), running Fedora 11. After logging off, the text terminal screen goes blank as a power saving feature. However, upon restore the backlight setting is one fifth full luminosity.
After a bit of digging, the acpitool manual claims it can update the brightness setting (with -l x) using the /proc/acpi/ibm/brightness file. However, the file doesn't exist. I did find the brightness file under /proc/acpi/video/VID1/LCD0/. A redirect of the highest setting restores luminosity (the setting is 1 through 100; after the screen blank it had gone down to 28): echo 100 > /proc/acpi/video/VID1/LCD0/brightness
The last problem is one of persistence. For the time being, I've not found a solution. Fedora seems to have made the assumption that GNOME or KDE is all anyone uses.
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