[Bug 94171] ati multihead black on one output

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94171

--- Comment #5 from Felix Miata <mrmazda at earthlink.net> ---
Created attachment 209811
  --> https://bugzilla.kernel.org/attachment.cgi?id=209811&action=edit
Xorg.0.log F23 on big41, black DVI 1920x1080 output

On host big 41 in Fedora 21 with KDE4 and kernel 4.1.13 on Cedar booting
multi-user.target, using startx and
xrandr --dpi 144 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1680x1050
both LCD screens play Xorg as expected, 1920x2130.

With
xrandr --dpi 144 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1920x1440
Xorg runs the LCD, where xrandr reports 1920x2520, as expected, but turns the
CRT black. If I append --rate 75, which isn't required for expected results
with Intel 4 Series or NVidia G84 gfxchips, then both displays work, comprising
1920x2520 as expected.

Still with CRT on VGA and LCD on DVI, startx with
xrandr --dpi 120 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1600x1200
produces 1920x2280 as expected in Xorg - no --rate parameter is required.

Fedora 23 with KDE5 and kernel 4.4.3 on same host with same three displays and
Cedar mirrors exactly as herein described for Fedora 21.

Replacing the Cedar in big41 with rv516 X1300, and still using F23,
xrandr --dpi 144 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1920x1440
keeps the DVI's LCD black while in Xorg's expected 1920x2520, but working as
expected on the ttys, even with
xrandr --dpi 120 --output DVI-0 --mode 1920x1080 --above VGA-0 --output VGA-0
--primary --mode 1600x1200
and even if appending --rate. With rv516, lowering demand all the way to
xrandr --dpi 108 --output DVI-0 --mode 1280x720 --above VGA-0 --output VGA-0
--primary --mode 1280x1024
is required to see output on the DVI portion of 1280x1744 on the LCD.

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