It seems that disabling apparmor removes the message:
kernel: [ 194.693603] audit(1208351567.253:3): type=1503 operation="inode_permission" requested_mask="::rw" denied_mask="::rw" name="/dev/tty" pid=6807 profile="/usr/sbin/cupsd" namespace="default"
And printing resumes.
It seems that disabling apparmor removes the message:
kernel: [ 194.693603] audit(120835156 7.253:3) : type=1503 operation= "inode_ permission" requested_ mask=": :rw" denied_mask="::rw" name="/dev/tty" pid=6807 profile= "/usr/sbin/ cupsd" namespace="default"
And printing resumes.