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When using "su - myuser" to change from root to a non-privileged user, "mesg n" from the default .profile fails with "mesg: error: tty device is not owned by group `tty' or "mesg: cannot open /dev/ttyS0: Permission denied", depending on whether mesg comes from busybox or util-linux. This does not happen during a normal login because permissions on /dev/tty* get changed while doing that, something that isn't possible with plain "su -". As the error can't be avoided and failures of mesg probably aren't particularly important, now error messages get dumped to /dev/null. [YOCTO #11127] (From OE-Core rev: 4511a524f906c97db7c7674ad34e7bc8630649e3) Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>