[Intel-gfx] DP link training and performance issues with HDMI USB-C dongle and Skylake

2016-06-23 Thread Jani Nikula 
On Thu, 23 Jun 2016, Andy Lutomirski  wrote:
> I have a Dell XPS 13 9350 (Skylake) and a Dell DA200 adapter.  The
> latter is a Thunderbolt device that includes an HDMI port and connects
> over USB Type C.  I believe that it's internally using DP Alternate
> Mode.

> I don't know whether this is a hardware issue, an Alpine Ridge
> firmware issue (mine is out of date because it appears to be
> impossible to update it on Linux for now), or an i915 driver issue.

At least a driver issue. The support is not there yet. Bug at [1].

BR,
Jani.


[1] https://bugs.freedesktop.org/show_bug.cgi?id=93578



-- 
Jani Nikula, Intel Open Source Technology Center

DP link training and performance issues with HDMI USB-C dongle and Skylake

2016-06-22 Thread Andy Lutomirski 
I have a Dell XPS 13 9350 (Skylake) and a Dell DA200 adapter.  The
latter is a Thunderbolt device that includes an HDMI port and connects
over USB Type C.  I believe that it's internally using DP Alternate
Mode.

When I plug it in on 4.7-rc4, I get spew like this:

[   90.718106] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   91.077604] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   91.437059] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   91.796479] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   92.156101] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   92.515647] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   92.875184] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   93.234735] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   93.594294] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   93.953812] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   94.313390] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   94.673043] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   95.032890] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   95.393016] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   95.752879] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   96.113074] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   96.473068] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   96.833185] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   97.193233] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   97.553138] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   97.913526] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   98.273525] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   98.634178] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   98.993859] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   99.354484] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[   99.714669] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  100.077412] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  100.432684] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  100.792499] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  101.152378] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  101.512265] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  101.872466] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  102.232284] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  102.592251] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  103.111283] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  103.466511] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  103.826082] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  104.191906] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  104.547038] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  104.911264] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  105.270679] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  105.625774] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  105.986064] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  106.350045] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  106.705325] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  107.064897] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  107.431263] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  107.790793] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  108.146016] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  108.506093] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  108.865924] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[  109.225629] [drm:intel_dp_start_link_train [i915]] *ERROR* failed
to train DP, aborting
[