Message: previous - next
Month: August 2017

Re: [trinity-users] Displays ... again ...

From: dep <dep@...>
Date: Mon, 14 Aug 2017 13:20:19 -0400
said Peter Laws:
| CentOS 7 current, TDE current.  Nvidia Quadro M2000 (4 x DP out), 2 x
| Dell P2416D displays.
| Applied patches last week and one of them (that seemed to be related
| to the Nvidia proprietary drivers) blew up the system.  Eventually
| ended up re-installing in an ultimately-failed bid to get productive
| again (this is my work system).
| Decided to forgo the Nvidia drivers and use the open source stuff.
| Xrandr is a nightmare though, so I thought "well, just use the TDE
| built-in screen controls".
| Problem is that System Settings -> Monitor & Display can only see one
| of the displays.  How do I get it to see the 2nd display?
| Yes, it's plugged in.  Yes, I've checked "Enable global display
| control".  Yes, I've clicked "Rescan Displays" (many times). "Test
| Settings" gets me "xrandr: Failed to get size of gamma for output
| default".
| Not sure the system is seeing the first display correctly even though
| it's working (I am typing this message on it) because while is sees
| 2560 x 1440 pixel, it thinks the refresh rate is 0 Hz (though, again,
| its working).
| Do I have to create and edit an Xorg.conf?  Because I tried that and
| it didn't go well not to mention defeating the purpose of a "settings"
| GUI ...

I encountered much the same thing, also with a Nvidia vid card, just 
recently. Like you, I got no satisfaction with the Monitor & Display 
setting in KControl, which also failed to see one of my two monitors.

I ended up installing, again, the current Nvidia driver for my card, and 
the Nvidia control application. Then I went in the Nvidia app to "X Server 
Display configuration" where both monitors were seen. I was able to 
configure them as to their relative position and so on.

That having been said, there *is* a little voodoo to it, but it gives you 
something that if fiddled with will ultimately work.

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