Comment # 27 on bug 920937 from Johannes Meixner

Christian Boltz,
it seems AppArmor may somehow prohibit that
even root can open USB device node files
which causes that CUPS cannot detect USB printers.

Can you have a look what might go on regarding AppArmor here?


Basically I don't know anything about AppArmor (or SELinux)
so that I cannot help with AppArmor (or SELinux) issues.

FYI:
On my openSUSE Tumbleweed system where it works
I do not have the actual AppArmor software installed
(except libapparmor1 that is required by systemd):
------------------------------------------------------------------------
# rpm -qa | grep -i apparmor
libapparmor1-2.9.1-4.1.x86_64

# rpm -e --test libapparmor1
error: Failed dependencies:
libapparmor.so.1()(64bit)
 is needed by (installed) systemd-210-39.1.x86_64
libapparmor.so.1(APPARMOR_1.1)(64bit)
 is needed by (installed) systemd-210-39.1.x86_64

# rpm -q --requires systemd | grep -i apparmor
libapparmor.so.1()(64bit)
libapparmor.so.1(APPARMOR_1.1)(64bit)
------------------------------------------------------------------------