[Bug 101245] Haswell ULT max. resolution regression in KMS [HSW] [i915]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101245

--- Comment #11 from Michael Mounteney <gate03 at landcroft.com> ---
Thank you for the correction on the xrandr commands.  I confirm that your
settings work, and that the display is switched to 2560x1600.

I now have to find a way to incorporate the commands into my userspace start-up
sequence, since currently I run lightdm and have to run "DISPLAY=:0 konsole" as
root in another virtual console, to be able to enter the xrandr commands and
have them take effect.

The display is a cheap unbranded Korean one.  It has a dual-link DVI-D
connector, an HDMI and a VGA.  The Haswell-ULT computer is connected to the
HDMI.  To the dual-link DVI-D is connected another Linux computer running
4.10.11 with this graphics adaptor:

> 00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6250]

and this displays at 2560x1600.  I switch between the two using input selector
buttons on the monitor bezel.

To be honest, I don't fully understand Villes explanation but if the monitor
really is returning nonsense in its EDID then I suppose GIGO applies and this
bug should be closed.  Maybe we need CONFIG_DISTRUST_CRAPPY_LYING_EDID or
similar.

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