[Bug 19168] xset dpms force off does not turn off LCD backlight

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19168





--- Comment #4 from Alex Deucher <agd5f at yahoo.com>  2008-12-19 07:43:40 PST ---
(In reply to comment #3)
> > Is this regression?  Did the backlight used to go off in a previous release?  
> For me, the problem has always existed. But before, I used the PBButtonsd
> daemon (http://pbbuttons.berlios.de/). This daemon switched off the backlight
> putting the level brightness to zero. 
> But I think the radeon driver should switch off the backlight alone without an
> other daemon because all "power manager" programs (like gnome-power-manager)
> use the DPMS features to control the switch on/off display. 
> 

I agree, I just don't know how apple does it.

> 
> > I suspect apple has the backlight wired up some non-standard way.
> Yes, I agree with you. I also read about this on internet but I can't find the
> article again. 
> 
> How can I help you to find a solution ?
> 

if you could use radeontool from here:
http://cgit.freedesktop.org/~airlied/radeontool
and dump the regs when the backlight is on and when it's off and attach the
dumps, I'll see what I can find. as root:
./radeontool regmatch '*' > blon.dump
./radeontool regmatch '*' > bloff.dump


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