[Bug 91202] Output to DVI-I (or DVI-D) is blank on Tonga (R9 285 and 380X) with multiple monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91202

--- Comment #9 from Vedran Miletić <rivanvx at gmail.com> ---
EoD did testing on Sapphire R9 380X Nitro, details at
https://gist.github.com/EoD/2baa78b81e233218a59c and copied below:

Booted with DVI-D-0 + HDMI-A-0
Both displays work

Booted with DVI-I-1 + HDMI-A-0
Both displays work

Booted with DVI-D-0 + DVI-I-1
DVI-D-0 shows output, DVI-I-1 stays blank  (via xrandr)

Booted with DVI-I-1 + plugging in DVI-D-0 after boot
DVI-I-1 shows output, DVI-D-0 stays blank  (via xrandr)

Booted with DVI-I-1 + plugging in DVI-D-0 after boot + removing DVI-I-1: 
DVI-D-0 stays blank  (via xrandr)

Booted with DVI-I-1 + plugging in HDMI-A-0 after boot + removing DVI-I-1 +
plugging in DVI-D-0:
HDMI-A-0 shows output, DVI-D-0 stays blank (via xrandr)
When switching to a virtual termina, HDMI-A-0 goes blank, DVI-D-0 shows output

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