<7>[ 660.210354] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.210548] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 660.210866] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.211030] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 660.211436] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.211589] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 660.211891] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.212050] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6) <7>[ 660.212442] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.212597] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry <7>[ 660.212897] i915 0000:03:00.0: [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 003a w(1) <7>[ 660.213057] i915 0000:03:00.0: [drm:intel_hdmi_hdcp_read_bksv [i915]] Read Bksv over DDC failed (-6)