Proper dual monitor set up somewhere?

[therelic]

Going to try the wily beta. See if that clears up the problems.

[therelic]

Something everyone missed is that xrandr doesn't even try to detect or show any information on dvi-i-0 ( it looks for dvi-i-1 which doesn't exist. ).

Not sure why xrandr isn't finding a monitor that is there when xorg takes over.

[elijathegold]

While not as likely to be helpful, a look through dmesg wouldn't hurt either.

[oshunluvr]

Must be something with KDE, a new profile didn't seem to work either. Guess I need to find out if that will be fixed in 15.10 or if I need to look elsewhere.

I'm unclear as to how you come to that conclusion. If it were Plasma5 (KDE), a clean user would likely be OK. It could be Plasma5 but it's more likely the display manager (SDDM), Xorg, the kernel/driver because it relates to monitor detection. xrandr doesn't show it, therefore something that loads prior to xrandr is the likeliest problem. KDE loads after xorg and xrandr is part of xorg not Plasma5. AFAIK, Plasma doesn't really do monitor detection, just allows you to change settings.

Installing Wily is a good idea. It might just go away with the newer kernel. Here's other things to try:

• Enable the xorg-edgers ppa and install the 355 nVidia driver (I'm using it without issue on a GTX 780).
• Boot to a live version (usb or cd) of 15.04 and see if your monitor works normally there.
• Actually read through /var/log/Xorg.0.log and ~/.xsession-errors and/or attach a copy of both to a post for review.
• Boot with one monitor attached at a time to verify they both work independently and copy the logs and xrandr output and save them for later comparison.

The most interesting thing is that while xrandr can't "see" the second monitor, some part of xorg does because the mouse cursor is active there - even though xrandr reports an active desktop size of only the one monitor. I'd love to get a gander at your Xorg.0.log. The answer (or at least the proper question) might be in there.

[otisklt]

If the nvidia config works correctly then try to use it to reset the desktops.
A recent kernel update seemed to knock my multi-display config out of whack in a similar way and the system settings would not allow me to fix it properly but the displays manager in the amd config worked to restore the setup.

Otherwise uninstall the video drivers and do a clean install of them.

[therelic]

Must be something with KDE, a new profile didn't seem to work either. Guess I need to find out if that will be fixed in 15.10 or if I need to look elsewhere.

Thanks for all the help.

[oshunluvr]

Found a couple others with that card and Plasma configuration but no real solutions.

Another test is the create a new user and log in as that user. This eliminates the possibility of a bad or corrupted plasma config file.

[elijathegold]

http://askubuntu.com/questions/61544...ter-sddm-login

Nice find.

[oshunluvr]

http://askubuntu.com/questions/61544...ter-sddm-login

[elijathegold]

Probably a silly question, but does it still work as one desktop? (wondering if cable could have been knocked loose)

[therelic]

When I originally upgraded it came up as both monitors being one screen, but with the all the plastic and seperation of the monitors I wanted to get back to my 14.10 set up that was essentially 2 seperate xscreens (xscreen-0 and xscreen-1 in nvidia-settings) each with its own task manager bar and virtual desktops.

[elijathegold]

So the monitor works as one desktop across both but not with two x sessions?

[therelic]

If it was a cable issue how would the monitor work for the POST and boot up text processes, until it switches the monitor to the primary login screen?

nvidia-settings detects both monitors and allows me set the layout. Just seems like 15.04 simply refuses to allow 2 xscreens for some reason in this situtation.

I am wondering if I need to go into config and erase some old data from the pre-version upgrade to get this working or if 15.04 simply will not work with 2 independant monitors.

Card is a 430 gt, but it hasn't had any problems with any of the newer drivers yet.

[ 22.437] (II) NVIDIA dlloader X Driver 346.96 Sun Aug 23 21:31:48 PDT 2015

[oshunluvr]

Clearly, your DVI screen has not been correctly detected. Just be be sure - disconnect and re-connect your monitor cable on both ends, because it sounds like a cable issue.

If no joy: which driver are you using? And list your hardware - some nvidia cards, notiably the GTX 760, can have issues with the newer kernels/drivers.

If you're unsure which driver
cat /var/log/Xorg.0.log |grep Driver

will list it.

[therelic]

-xrandr

Screen 0: minimum 8 x 8, current 1280 x 1024, maximum 16384 x 16384
VGA-0 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.0 60.0
800x600 75.0 60.3
640x480 75.0 59.9
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

-

Which makes even less sense due to the monitor being active but with no desktop. DVI-I-1 is active I get a black icon on it, it works with xinerama to extend the desktop too that monitor. I just can't seem to get dual xscreens working with anything I try.