[ltp] LCD stays off in X

[Rob Hess]

On 6/11/07, Alex Deucher <alexdeucher@gmail.com> wrote:
> On 6/10/07, Richard Neill <rn214@hermes.cam.ac.uk> wrote:
> >
> >
> > Rob Hess wrote:
> > > Hi,
> > >     I have a T60 with the Gentoo-patched 2.6.20 kernel and fglrx
> > > 8.37.6.  Since I've upgraded to 2.6.20, I've noticed that, under X,
> > > the LCD will not come back on after it goes off.  For example, if I
> > > just boot the computer, but let it sit on the login screen for a
> > > while, the lcd goes off and stays off.  I can switch to the console,
> > > and then the LCD comes back on, but I can never go back to X, even if
> > > I restart XDM, reload the fglrx module, etc.
> > >     I am not quite sure where to begin looking to solve this problem.
> > > Can anyone offer advice?
> >
> > Does `radeontool light on` help at all? Or, can you get any mileage out
> > of xset  (remember to export DISPLAY) ?
> >
> > Also, to bisect the problem - can you reproduce with the new xserver,
> > but old kernel? Or the current kernel + vesa driver?  Does temporarily
> > restarting the X server with the vesa driver help?
>
> radeontool is useless on avivo based radeons.  The display control
> register layout is completely different.

Yes, I've tried radeontool in the past with no success on this
particular box.  I will experiment with different kernel/driver
combinations and report back what I find.

-Rob