[Bug 91451] Apple miniDP-to-VGA adapter doesn't work anymore since Kernel 4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91451

--- Comment #5 from Carl Michal <michal at physics.ubc.ca> ---
I see the same on a Dell XPS 13 9343 Broadwell system with an Apple dongle.

Setting drm_kms_helper.dp_aux_i2c_transfer_size to 1, 2 or 4 the dongle works,
8 doesn't work.

Even with the default setting, I was able to:
xrandr --addmode DP1 1920x1080
xrandr --output DP1 --mode 1920x1080

and have the dongle "work" - though xinerama was kind of messed up -
applications didn't realize that there were two separate displays.

I also have a DP to HDMI/DVI dongle that works fine with the default setting.

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