[Bug 39696] dual head: different vert refresh freq, applications sync to the wrong one

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Aug 10 06:45:40 PDT 2011


--- Comment #13 from Alex Deucher <agd5f at yahoo.com> 2011-08-10 06:45:40 PDT ---
(In reply to comment #12)
> Well, as it seems to be impossible (at least for my combination of LVDS and DP)
> to have two (or even more) outputs in sync at the same time,

Unfortunately this is a hw limitation.  It can really only work in some very
limited situations.  You would have to use identical monitors with identical
modelines being driven by the same encoder types.  Even in your setup, if you
could have used the same crtc, each monitor has different timing for the
display so it likely wouldn't have worked as one of the displays may not have
synced properly.

Modeline "1920x1200"x60.0  164.80  1920 2020 2052 2224  1200 1202 1208 1235
(74.1 kHz)

Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080  1200 1203 1209 1235
+hsync -vsync (74.0 kHz)

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