<7>[ 684.023643] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 684.023828] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK on first message, retry <7>[ 684.024260] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 684.024420] i915 0000:00:02.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 684.024856] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 684.025010] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK on first message, retry <7>[ 684.025430] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 684.025583] i915 0000:00:02.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)