[Bug 106596] [snb DP-to-DVI dongle] miniDP to external monitor with DVI-D via miniDP to DVI-D adapter and blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106596

--- Comment #5 from Jani Nikula <jani.nikula at intel.com> ---
>From logs

[    1.854035] [drm:intel_dp_detect [i915]] [CONNECTOR:63:DP-1]
[    1.854896] [drm:intel_dp_read_dpcd [i915]] DPCD: 11 0a 82 01 01 05 01 81 00
01 04 01 0f 00 00
[    1.855591] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:63:DP-1] status updated from unknown to disconnected
[    1.855595] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:63:DP-1] disconnected

we can read the DPCD but we decide nothing's there after all.

Would be great to be able to get the sink count from the dongle. Do you have
CONFIG_DRM_DP_AUX_CHARDEV=y? i.e. do you have /dev/drm_dp_auxN devices, N is
0-based number?

What does this output:

# dd if=/dev/drm_dp_aux0 bs=1 skip=$((0x200)) count=1 | od -tx1

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