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Old 01-21-2019, 08:00 PM   #1
Dan Suson
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Registered: Aug 2007
Location: Valparaiso, IN
Distribution: Slackware
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Can't extend display to second monitor with AMD Radeon RX 560 video card


I purchased the AMD Radeon RX 560 video card yesterday. I run a two monitor system. After installing the card I have a single monitor display mirrored on both monitors. I have not been able to figure out how to convert this into a true dual monitor system. It appears that the second monitor is not be detected. I have attached my Xorg.0.log for reference. Running lspci -v |grep VGA only shows one device:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67ef (rev cf) (prog-if 00 [VGA controller])

Running xrandr -q as root in a terminal yields

No protocol specified
Can't open display :0

so that doesn't help directly. However, when I open the KDE system settings->Display and Monitor->Display Configuration (or Size & Orientation) I only see the one monitor.

I have tried modifying my xorg.conf file (also attached as xorg.conf.txt) where I tried to use Xinerama to go to multiple displays, with no success.

I have not been able to find any other help with this. Any suggestions would be appreciated.
Attached Files
File Type: log Xorg.0.log (65.1 KB, 7 views)
File Type: txt xorg.conf.txt (2.7 KB, 8 views)
 
Old 01-21-2019, 08:29 PM   #2
abga
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Quote:
Originally Posted by Dan Suson View Post
I have tried modifying my xorg.conf file (also attached as xorg.conf.txt) where I tried to use Xinerama to go to multiple displays, with no success.

I have not been able to find any other help with this. Any suggestions would be appreciated.
Have a read on this:
https://wiki.archlinux.org/index.php...sing_xorg.conf
 
Old 01-27-2019, 09:06 PM   #3
Dan Suson
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Registered: Aug 2007
Location: Valparaiso, IN
Distribution: Slackware
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Resolution to display problem

I was able to figure out what the problem was. I run Slackware-current on a second partition and noticed that it was extending the display across both monitors. Comparing the log files from Slackware-14.2 and Slackware-current I saw that current was running amdgpu-pro and 14.2 was not. I dug around to see what needed to be done to get amdgpu-pro to run on 14.2, and saw that it was going to be very difficult, if not impossible, to make this happen. Given that I shifted from nvidia to amd in order to get away from proprietary drivers and now it looked like I was having to go back into the same problem, only larger, I decided to trade out the Radeon card for an NVIDIA card. I've not used LinuxQuestions enough to mark the thread as closed, but as far as I'm concerned it can be closed now.
 
Old 01-27-2019, 10:12 PM   #4
bassmadrigal
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Are you sure it was running the proprietary driver? Because there is an open source amdgpu driver included in the kernel and the pro just adds some extras that aren't open source. Also, I don't know of anyone that is providing amdgpu-pro packages for Slackware (I used to provide some older versions, but had no way to easily test it).

It is more likely that you were running the open source amdgpu driver and that if you were to install a more modern kernel and possibly X and/or mesa, that you could run the same driver on 14.2 and get the same support.
 
  


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