At Sat, 13 Feb 2016 10:14:30 -0500 CentOS mailing list centos@centos.org wrote:
I sent this out about a week or so ago, but I have heard nothing. I am *thinking* it is a SELINUX problem, but I cannot figure out what. The SELINUX settings for both machines are *exactly* the same (the stock defaults for a standard CentOS 6 install). The *only* difference is that the desktop (sauron) has a few VMs setup (under KVM) and the laptop (gollum) does not. The desktop has an AMD processor and a nVidia video chipset and the laptop has an Intel processor and an Intel graphic controller. Although I can't see how either the processor or video chipset would have anything to to with the USB or USB serial port-type devices. The desktop also has a PCI quad serial port card and includes the 8250.nr_uarts=8 kernel option and is set up to use an analog dialup modem to make PPP connections (again, I don't see that as having anything to do with anything).
OK, I tried rebooting without the '8250.nr_uarts=8' option and that had no effect.
I wonder if I should file a bug report? I don't know if I should file it with the Red Hat bugzilla or the CentOS bugzilla.
Both machines are running the same kernel: 2.6.32-573.12.1.el6.x86_64
At Thu, 4 Feb 2016 16:13:33 -0500 Robert Heller heller@deepsoft.com wrote:
I have two computers: both running CentOS 6.7, 64-bit, with kernel 2.6.32-573.12.1.el6.x86_64. One is a laptop with an 2 core Intel processor and the other is a desktop machine with a 4 core AMD processor. Both with selinux enabled.
I have a USB serial port device (a RR-CirKits LCC-Buffer USB). On the desktop I am getting this error:
sauron.deepsoft.com% sudo minicom Device /dev/ttyACM0 access failed: No such file or directory. sauron.deepsoft.com% dir -lZ /dev/ttyACM0 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM0
But it is working on the laptop!
gollum.deepsoft.com% dir -lZ /dev/ttyACM1 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM1
Same kernel, same device (except it is showing up as ttyACM1 on the laptop).
What is going on here?