[Bug 111516] make 'respect_downstream_limits' configurable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111516

--- Comment #1 from Jani Nikula <jani.nikula at intel.com> ---
Presumably if the display advertizes a mode on DVI that requires dual-link DVI
to work, said DVI interface supports dual-link DVI. However, we have no way of
knowing if the HDMI to DVI adapter you have actually supports dual-link or not;
most don't. In your case, using a HDMI to single-link DVI adapter without
limits would lead to a black screen, but with the current restriction it leads
to a working albeit reduced resolution display.

The way the limit works is filtering the EDID provided modes. So you just won't
see the modes that exceed single-link DVI capabilities. However, if you
explicitly add a user mode for 2560x1440 you should be able to use it without
adding a new module parameter or patching the kernel.

You can add the mode using xrandr.

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