[Bug 79173] Second screen unusable on R7 250E

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79173

--- Comment #16 from Ancoron <ancoron at chaoslayer.de> ---
Just to report back:

Got it to work with an active DisplayPort to dual-link-DVI adapter (a StarTech
DP2DVID2).

However, EDID is lost and probed modes are completely wrong (fallback
defaults?):

EDID for output DisplayPort-0
Printing probed modes for output DisplayPort-0
Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344  768 771 777 806 -hsync
-vsync (48.4 kHz e)
Modeline "800x600"x60.3   40.00  800 840 968 1056  600 601 605 628 +hsync
+vsync (37.9 kHz e)
Modeline "800x600"x56.2   36.00  800 824 896 1024  600 601 603 625 +hsync
+vsync (35.2 kHz e)
Modeline "848x480"x60.0   33.75  848 864 976 1088  480 486 494 517 +hsync
+vsync (31.0 kHz e)
Modeline "640x480"x59.9   25.18  640 656 752 800  480 489 492 525 -hsync -vsync
(31.5 kHz e)


To solve this I took the mode lines from the DVI connected monitor and manually
specified it in the xorg.conf:

EDID for output DisplayPort-0
Not using mode "1024x768" (hsync out of range)
Not using mode "800x600" (hsync out of range)
Not using mode "800x600" (vrefresh out of range)
Not using mode "848x480" (hsync out of range)
Not using mode "640x480" (hsync out of range)
Printing probed modes for output DisplayPort-0
Modeline "2560x1600 at 60"x59.9  268.00  2560 2608 2640 2720  1600 1603 1609 1646
+hsync +vsync (98.5 kHz UP)
Modeline "1280x800 at 60"x59.9   71.00  1280 1328 1360 1440  800 803 809 823
+hsync -vsync (49.3 kHz)

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