<7>[ 597.983735] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.983976] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 597.984320] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.984521] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 597.984941] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.985142] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 597.985479] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.985677] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 597.986095] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.986292] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 597.986627] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 597.986826] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)