Radeon: hot-swap VGA-out monitor

Adam Jackson ajax at nwnk.net
Wed Sep 5 09:27:52 PDT 2007

On Wed, 2007-09-05 at 07:59 -0500, Christopher Singley wrote:
> I have a Thinkpad R51 with an ATI Radeon 250 graphics card.  The card has a 
> VGA out port, and I like to run in dual-head configuration (external monitor 
> attached) using the MergedFB options of the Radeon X driver.
> This generally works well; however I'd like to be able to hot-swap monitors & 
> toggle at will between single-head & dual-head configuration.
> Using the radeon driver's "MergedFBAuto" option works to allow X to autodetect 
> single/dual-head configuration when it starts up.  If it starts up in 
> dual-head mode, setting "MetaModes" like "1024x768-1024x768 1024x768" 
> additionally allows me to use xrandr to dynamically switch back & forth 
> between single/dual-head when I plug/unplug the external monitor.
> However, if no external monitor is detected when X starts up, I don't know how 
> to force a configuration so that when I subsequently plug in an external 
> monitor, I can switch over to dual-head configuration on the fly without 
> restarting X.
> I imagine this must be a feature desired by many people other than just me.  
> Can anyone give me a hint how to set this up?

Use the new 6.7.192 driver, and use xrandr(1) to enable and disable
outputs at runtime.

- ajax
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