[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 #12 from lazanet96 at gmail.com ---
Problem persists with Ubuntu 17.10 / DRM 2.49.0 / 4.11.0-041100rc8-lowlatency,
LLVM 4.0.0

Tested all resolution options for all three of the monitors, and has been able
to output either on HDMI and VGA or HDMI and LVDS (internal). I have no idea
what else could I test (or which code could I look at). Would setting drm.debug
flag  to 0x4 in GRUB provide some more relevant data?  

Also, I have found this forum thread about the same issue, which dates from
2013: https://ubuntuforums.org/showthread.php?t=2194601

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