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We had a user report that running setserial on /dev/ttyACM0 didn't work. He pointed at an old patch by Oliver Neukum from 2008 that never went anywhere.. http://permalink.gmane.org/gmane.linux.usb.general/9236 I made some minor changes to get it to apply again, and got the user to retest on 3.1, and he reported it worked for him. https://bugzilla.redhat.com/show_bug.cgi?id=787607 The diff below is against 3.3rc. The only difference between this and the version the user tested is the removal of the if (!ACM_READY) test Havard removed ACM_READY in 99823f457d5994b3bd3775515578c8bfacc64b04 I'm unclear if there's need for a different test in its place. From: Oliver Neukum <oliver@neukum.org> Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>