[Bug 99784] AMD 7470m When VGA plugged into laptop, only one monitor working at a time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99784

--- Comment #17 from lazanet96 at gmail.com ---
Created attachment 136058
  --> https://bugs.freedesktop.org/attachment.cgi?id=136058&action=edit
Workaround (Ubuntu 17.10 DRM 2.50.0 / 4.13.0-19-generic, LLVM 5.0.0)

After testing new version of kernel on Ubuntu 17.10 installation (wayland +
systemd) I discovered by chance that after suspend and unsuspend (systemctl
suspend), internal monitor starts displaying image and everything works (for
the first time with radeon driver).

So as a workaround I used /etc/rc.local compatibility to trigger suspend after
appropriate ring level is initialized during boot(sudo chmod +x /etc/rc.local
is also required). 

I tested same method with 14.04 LTS with no success (so I don't know exactly
what upgrade made it work).

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