[Bug 75345] [HD4600 regression] DVI does not support dual-link

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75345

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #8)
> I should add the DVI output is reported by KMS as a HDMI output, so perhaps
> it's not possible to identify it as a DVI port and limit the bandwidth?  If
> this is correct, then in theory one should be able to connect a HDMI 1.4
> capable monitor (not mine) to the DVI port with a passive adapter, and get
> 2560x1600 at 60Hz.

In theory, yes. You are still going beyond the cable spec so there is some
danger that you would lose the signal.

If we ignore the ongoing issue with HDMI->active dual-DVI links, this here bug
is fixed by

commit 6375b768a9850b6154478993e5fb566fa4614a9c
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Mon Mar 3 11:33:36 2014 +0200

    drm/i915: Reject >165MHz modes w/ DVI monitors

    Single-link DVI max dotclock is 165MHz. Filter out modes with higher
    dotclock when the monitor doesn't support HDMI.

    Modes higher than 165 MHz were allowed in

    commit 7d148ef51a657fd04036c3ed7803da600dd0d451
    Author: Daniel Vetter <daniel.vetter at ffwll.ch>
    Date:   Mon Jul 22 18:02:39 2013 +0200

        drm/i915: fix hdmi portclock limits

    Also don't attempt to use 12bpc mode with DVI monitors.

    Cc: Adam Nielsen <a.nielsen at shikadi.net>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75345
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=70331
    Tested-by: Ralf Jung <post+kernel at ralfj.de>
    Cc: stable at vger.kernel.org
    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

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