RandR 1.5 "Monitors" and splitting a single physical display

Nathan Schulte nmschulte at gmail.com
Mon Mar 13 18:32:47 UTC 2017

On 03/07/2017 05:56 PM, Jack Coulter wrote:
> Is it possible for there to be multiple monitors for a single output, at
> least as far as the RandR protocol is concerned, and is support simply
> needed in xrandr, or is what I'm trying to do simply not possible?

I wonder the same; I'm looking to split an Output as two Monitors, and 
then rotate one of the Monitors.  I am using an active splitter, like 
Jack is w/ the Matrox Dual Head 2 Go devices (I'm using a Sunix DPD2001, 
with DisplayPort Multi-Stream Transport disabled).

I ran into issues trying to do setup multiple Monitors for an Output, 
and sent a mail to the list in September 2016; Aaron Plattner from 
NVIDIA responded, noting about the "ConnectionNumber" property from the 
xrandr --prop command.  The Intel hardware I'm using (Intel Skylake; 
Iris Pro Graphics P580 [8086:193d] (rev 09).

The thread can be viewed here:


I had to give up at the time and still haven't had a chance to poke this 
again.  I have a feeling this isn't supported, but I couldn't find 
anything in the protocol/extension specifications stating so.  In fact, 
the specs imply that it _is_ indeed possible.  Perhaps only certain 
drivers provide this level of support?

Jack, let me know if you figure this out, please and thank you!


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