drm_ioctl noisiness in dmesg

Every second or so, my BBB (running 2013.09.04) emits:

[ 626.556210] [drm:drm_ioctl], pid=238, cmd=0xc01864b1, nr=0xb1, dev 0xe200, auth=1
[ 626.556323] [drm:drm_ioctl], ret = -38

into dmesg. I saw a comment in another post here suggesting removing the drm.debug=7 in the uEnv.txt on the FAT partition. But I assume that was originally put there for some reason, and has remained, so I wanted to ask

  1. Why was it originally added?
  2. Is there another value (other than 7) that might be useful, and not emit these above messages?

It was there because we were having HDMI issues an the information sent out was found to be useful in debugging the HDMI issue.

If you remove it totally, then that should stop the messages from being sent.


That’s fine. I was just curious if there was some other debug level, that might note connect/disconnect of the port, or other useful things that were less constant, also might exist. I’ve removed it totally for now.