On Tue, Aug 06, 2013 at 02:40:24PM +0200, Takashi Iwai wrote:
> We've seen a problem that the DP port on a docking station is often
> not detected properly or misconfigured (no proper native modes) with a
> Haswell-based laptop. The trace showed that the driver gave up or got
> only insufficient EDID, maybe due to some unstable aux communication.
>
> As a band-aid fix, increase the number of retries from 5 to 10.
> This seems enough for our cases.
Did you test with
commit bc86625a4ff7574d4d4dba79723457711eb784e0
Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Sun Jul 21 16:00:03 2013 +0100
drm/i915: Retry DP aux_ch communications with a different clock after failures
That sounds like a relevant workaround.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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