Intel 855 hanging with xrandr

[Keith Packard]

On Wed, 2007-06-13 at 14:15 -0400, manu wrote:
> 	Hi all,
> I have latest git as of today (06/13) and I have 2 output for my laptop  
> (i855): the LFP and the VGA hooked up to my HDTV (1360*768).
> If the hdtv is on evry xrandr command works : toogling on/off any  
> output, rearranging the layout with --above etc, but as soon as I shut  
> off the hdtv the next xrandr command will hang the computer (i do not  
> have a way to ssh into it so i can't say how hard but at least locally  
> there is no way to kill X).

Sounds like the X server is wedged somewhere. Without a stack trace,
this will be very difficult to debug as I've never seen it do this (and
can't think of a place where it would wait forever in any case).

> Also I remarked that if I do xrandr with the dtv hooked up but shut off  
> (either in standby or unplugged) the VGA says it is connected, only  
> when I unplug the VGA cable does xrandr say that VGA is disconnected.

Yeah, the i855 can't tell if the external monitor is on or off; we
simply measure the impedence of the load to detect whether something is
plugged in or not.

-- 
keith.packard at intel.com
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