hey, i have a dell xps 13 ultraboock with an integrated intel graphics adapter, a Club 3D Displayport Hub + 2 Displays with displayport. The recent included support for DP MST is only partly working with the Club 3D CSV 5300 DP Hub. The two connected displays are only recognised as one display, and both show the same. They are basically working in clone mode. But it should be possible to operate the hub in extended mode. While connecting the adapter to the XPS 13 DP port, these error messages can be found in dmesg: [ 64.554887] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.594831] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.634858] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.674876] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.714898] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.754935] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.794970] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not supported [ 64.795191] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting if further information is needed, please let me know. sincerly stephan
The error messages are presumed fixed in v3.18-rc3 by commit 7809a61176b385ebb3299ea43c58b1bb31ffb8c0 Author: Jani Nikula <jani.nikula@intel.com> Date: Wed Oct 29 11:03:26 2014 +0200 drm/i915/dp: only use training pattern 3 on platforms that support it Please reopen if you have other problems or the problem persists with v3.18-rc3 or later.
i tried the 3.18.rc3 kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-rc3-vivid/. the error messages from above are now gone, but now i have this in dmesg: [ 113.968647] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch receive error status 0x6225003f besides this, the hub is still only working in clone mode, and xrandr sees only one display, but still, two are connected.
To keep the bug entries sane, can you please file a new one and link to this one here? Thanks, Daniel