[Bug 100954] i915 i2c-dev failures with recent chips and docking stations

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Oct 22 10:29:10 UTC 2018


https://bugs.freedesktop.org/show_bug.cgi?id=100954

--- Comment #15 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Mariusz Mazur from comment #14)
> @Ville, is the lack of remote i2c writes also responsible for my usb-c to
> hdmi adapter not allowing ddc/ci?

Only if it is an MST device. Otherwise you should at least be able to try it.
It may not work in practice though on account of crappy DDC/CI implementation
in the monitor. At least one monitor where I tried it didn't like the default
100 kHz bus speed and so bunch of things randomly failed until I lowered the
bus speed significantly.

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