[PATCH] modes: Force output modes for manually enabled heads

[Keith Packard]

Excerpts from Aaron Plattner's message of Thu Oct 08 13:29:03 -0700 2009:

> How do you propose having that happen?  Having X autodetect hotplugged
> screens and automatically extend the desktop to them?  Does that work
> today?

The kernel does hotplug detection and sends a uevent to the X server
which generates suitable RandR events. The desktop receives these
events and does something. The only case I'm not sure of is when gdm
is sitting alone on the display.

>  1. Allow X to start with no displays.  Automatically light them up when
>     they're plugged in (from within the server -- don't rely on a client to
>     do that).  Make damn sure that display hotplug detection is 100%
>     reliable, even for VGA.

We should be able to rely on a client to do this; desktop environments
already do, with the possible exception of gdm (which I just haven't
tested). Although, one option might be to always light up the first
monitor detected after the server starts.

-- 
keith.packard at intel.com
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