Since I've upgraded to F22 x86_64, I haven't been able to access
serial ports from a user account in the dialout group. Doing an ls
/dev/ttyUSB0 shows that the device special file is there, but the
group is not set to dialout:

$ ls -l /dev/ttyUSB0
crw-rw-r--. 1 root root 188, 0 Jul 25 03:29 /dev/ttyUSB0

Since the device file exists, udev is obviously finding the hardware,
which is an FTDI TTL-232R, and it works fine for root. The udev rule
to set the device's group to dialout appears to be present:

$ grep dialout /usr/lib/udev/rules.d/*.rules
/usr/lib/udev/rules.d/50-udev-default.rules:KERNEL=="tty[A-Z]*[0-9]|pppox[0-9]*|ircomm[0-9]*|noz[0-9]*|rfcomm[0-9]*",
GROUP="dialout"

Has anyone else seen this problem? Any ideas on why it's not getting
set to dialout?
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