screen brightness under lucid

[pkaplan1]

On Friday, May 07, 2010 09:25 Reinhold Rumberger wrote:
> On Friday 07 May 2010, pkaplan1 wrote:
> > I'm running lucid on a Thinkpad T41.  Never had a display problem
> > until the new install.
> > 
> > As soon as I start KDE (not other WMs), the screen is dimmed to
> > about 50% of brightness.  I can brighten manually, but it's a
> > PITA.
> > 
> > Has anyone observed this or found a solution?
> 
> My Laptop does the same thing when on battery - that's how I set it
> up. Check your power management settings, they might be causing this.
> 
>   --Reinhold

I checked this.  PM is configured to set the screen to full brightness when on 
AC power (as previously).  Changing these settings didn't affect the behavior.

My original description is wrong, however.  The behavior affects all window 
managers...whenever I start an X session, the screen is dimmed to about 50%.  
Even switching between running WMs on different virtual terminals causes the 
screen to dim to 50%.  Does this sound like a driver problem?  I'm running an 
ATI M7500 video card, but I didn't notice the behavior with the LiveCD??
Paul