Help with display management

[Petter Adsen]

On Sat, 4 Jul 2015 15:56:59 -0700
"Kevin O'Gorman" <kogorman at gmail.com> wrote:

> I'm running xubuntu 14.04 LTS, and have just replaced my mobo and
> graphics card with a new ASUS Z97 deluxe with onboard graphics.  The
> old card was nVidia, the mobo uses Intel graphics.
> 
> When I restarted the machine after the mobo-ectomy, xubuntu would only
> recognize 2 of my 3 monitors.  The mobo advertises it can support 3
> with resolutions up 'way beyond my actual HD monitors.  I created
> some space, and installed a fresh copy of xubuntu 14.-4.2.  It works
> fine.  I've removed all nVidia things from the old system, but it's
> still broken.
> 
> In both installs, both new and old, I can try to manage the monitors
> with the whisker menu's action item (at the bottom) for "All
> settings", with a gadget called "Display".  I don'[t know the proper
> names of the packages that provide these things, but I hope it's
> clear.
> 
> So I either have to replicate my other configurations in the new
> install, or somehow figure out what's broken in the old one.  I'd
> prefer the latter, if possible.
> 
> Details of what's wrong:
> The Display gadget shows 3 monitors, HDMI1, HDMI2 and ACI23" -- and
> these are arranged physically left to right on my tabletop.  They are
> all three the same model of monitor.  Normally, I have HDMI1 and
> HDMI2 working.  If I try to mark the 3rd monitor's "Use this output"
> then one of the first two will go dark.  I cannot get it to use all
> three at once.
> 
> I don't know why they're called what they are since all three
> moniotors are identical.  What's oddest is that the one that's marked
> ACI23" is the only one that is actually HDMI at the computer end.
> The others are a DP and mini-DP connector.
> 
> This is a configuration problem and not a hardware problem.  I know
> this because the fresh install of 14.04 does not have this
> limitation, and works fine with all three monitors.
> 
> So what do I do to get the three monitors?  Probably just ditch a
> config file somewhere, but which one?

First off, congratulations on your new motherboard :)

Could you send your /var/log/Xorg.0.log file (from both installs), or
paste it somewhere and send a link? The output of 'xrandr' might also
come in handy. If /etc/X11/xorg.conf exists, then send that too, but
also try moving it out of the way and restart X to see if that works.

Then we'll go from there.

Petter

-- 
"I'm ionized"
"Are you sure?"
"I'm positive."
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