Bug#485465: remember brightness level

[jidanni@jidanni.org]

Package: xdm
Version: 1:1.1.8-1

Every time I start xdm I have to turn the brightness back down (via
keypresses of Fn End here on my IBM Thinkpad r50e) from the maximum.
Not only upon a fresh boot but even upon an "xdm restart".

The brightness level of the Linux console does not need to be reset
however.

Therefore I wish xdm would remember and restore the brightness level
better.

I see nothing obvious in /var/log/Xorg.0.log (and /var/log/xdm.log is a
zero byte file last touched last year!)