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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB dp dongle] Aplle miniDP-to-VGA fails link training"
href="https://bugs.freedesktop.org/show_bug.cgi?id=69128#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB dp dongle] Aplle miniDP-to-VGA fails link training"
href="https://bugs.freedesktop.org/show_bug.cgi?id=69128">bug 69128</a>
from <span class="vcard"><a class="email" href="mailto:yangweix.shui@intel.com" title="shui yangwei <yangweix.shui@intel.com>"> <span class="fn">shui yangwei</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=69128#c7">comment #7</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=69128#c6">comment #6</a>)
> > I fetched intel-dp-fixes branch of this repo to Daniel's tree, then build a
> > kernel, this issue come up again.
>
> Hmm, please try the below patch on top of:
>
> > commit c030533419ec5f9ce042bafb6f40368f310181f8
> > Author: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
> > Date: Wed Sep 11 14:46:20 2013 +0300
> >
> > drm/i915/dp: read DPCD PSR capability only on eDP
>
> Thanks.
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> index 08f9d2d..97063b3 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -677,7 +677,7 @@ intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int
> mode,
> */
> if (intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> DP_DWN_STRM_PORT_PRESENT)
> - usleep_range(500, 600);
> + usleep_range(5000, 7000);
> else
> usleep_range(300, 400);
> continue;</span >
Test with this patch, this issue also reproduceable.</pre>
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