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I have a computer with 2 video cards:
 - 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Turks XT [Radeon HD 6670/7670]
 - 06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Cedar [Radeon HD 5000/6000/7350/8350 Series]
I use the open source radeon driver, not the proprietary one.
I have two VGA compatible monitors attached to those cards.
I use xrandr to extend my desktop.
After update openSUSE-2016-140 my monitor attached to the second radeon video
card turned black. I tried several options to enable it: The video card is
detected and seems to be installed properly. The monitor is also recognized. 
After installing the proprietary Radeon drivers with Xinerama, both cards and
monitors seem to be working again. But there are some features in xrandr, which
are not in the proprietary driver, which I would like to use.


Reproducible: Always

Steps to Reproduce:
1. Install update openSUSE-2016-140
2. Reboot or login again.

Actual Results:  
Installation was complete without any errors.
After logging in, the second video card did not send any signal to the monitor.


Expected Results:  
The second video card should send a signal to the monitor.

Please, inform me what additional information should I provide. I can reproduce
the behaviour and send you logs. I need:
1) which logs you would like to receive?
2) are there any console commands which I should try in order to send you the
output?