<7>[ 483.505195] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.505400] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry <7>[ 483.505720] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.505906] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 483.506373] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.506550] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry <7>[ 483.506864] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.507056] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 483.507503] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.507678] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry <7>[ 483.507993] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 003a w(1) <7>[ 483.508177] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)