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).
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@xxxxxxxxxxxx> 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?
>
>
>
--
Robert Heller -- 978-544-6933
Deepwoods Software -- Custom Software Services
http://www.deepsoft.com/ -- Linux Administration Services
heller@xxxxxxxxxxxx -- Webhosting Services
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