<7>[ 772.583131] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 772.583319] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK on first message, retry <7>[ 772.583704] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 772.583877] i915 0000:00:02.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 772.584290] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 772.584451] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK on first message, retry <7>[ 772.584861] i915 0000:00:02.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus tc1] NAK for addr: 003a w(1) <7>[ 772.585012] i915 0000:00:02.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)