<7>[ 726.786324] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.786545] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry <7>[ 726.786839] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.786987] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 726.787436] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.787574] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry <7>[ 726.787871] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.788016] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 726.788438] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.788576] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK on first message, retry <7>[ 726.788867] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpd] NAK for addr: 003a w(1) <7>[ 726.789013] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)