Bug#817243: gtk3 programs segfault when another display is active on other GPU

[Martin Truesdell]

I think it has more to do with activating a monitor on an additional GPU
as it is affecting my (stretch testing) desktop system with 2 discreet
PCI express GPUs. 

# inxi -G
Graphics:  Card-1: Advanced Micro Devices [AMD/ATI] Oland PRO [Radeon R7
240/340]
           Card-2: Advanced Micro Devices [AMD/ATI] Oland PRO [Radeon R7
           240/340]
           Display Server: X.org 1.18.1 driver: radeon tty size: 152x51
           Advanced Data: N/A for root

# dmesg | tail -n 1
[58960.283877] obconf[4679]: segfault at 10 ip 00007faa58965427 sp
00007fff9ef824c0 error 4 in libgdk-3.so.0.1800.8[7faa58905000+c7000]

# aptitude show libgtk-3-0
Package: libgtk-3-0                      
State: installed
Automatically installed: yes
Multi-Arch: same
Version: 3.18.8-1
[...]

# uname -r
4.3.0-1-amd64

Martin.