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Month: February 2013

Switchable/Hybrid Graphics and Linux Mint 14

I decided yesterday to take the plunge and move my laptop (HP dv6t Quad with an Intel i7, 8GB RAM, AMD 6770M and Intel graphics) from dual-booting to Linux only. I had been using Linux Mint 14 as a secondary OS on my desktop for a while and really liked what I saw. So, I grabbed the install disc and booted it up.

As usual, the install went without a hitch. I ran all the updates and then went to go install the proprietary AMD/ATI graphics driver (which is now done via “Software Sources” in the Preferences menu). That’s where everything went to hell. Xorg failed to start after rebooting, leaving me at text-based login. Not that I mind playing on the command-line, but vim hardly meets my needs as an IDE and it’s going to be really hard to debug graphical applications that way. So, I began my search. After piecing sources together, here’s what got me running:

First, we need to add the PPA from xorg-edgers so that we can install the ATI/AMD Catalyst Driver 13.1 without having to build it ourselves. The PPA works with Ubuntu 13.04, 12.10, 12.04, Linux Mint 14 and 13.

sudo add-apt-repository ppa:xorg-edgers/ppa
sudo apt-get update

Next, we can install the driver itself. While I highly recommend doing this just after running updates (and before breaking Xorg), it still works from the command-line after the broken drivers have already been installed.

sudo apt-get install fglrx

Now, everything I’ve read says that you need to remove the PPA before restarting, but nothing says why (if you know, please comment below).

sudo add-apt-repository --remove ppa:xorg-edgers/ppa 
sudo apt-get update

Finally, give the system a reboot. Everything should be working smoothly now… at least until the next Xorg update.

Getting FDMA Working on a CPN

As per my last post, I will show here the basic configuration of how to get FDMA working on a Lot 10 CPN. All CECOM documentation only shows how to get a JNN working, but (as CPNs don’t have a GPS to provide timing) we have to do things differently.


  • TFOCA-2 runs from Port 1 on the LOS case to J1 on the STT. In our LOS case, we had to use the spare fiber pair to connect to the CTM-100/C.
  • Serial cable connects from NT2R Serial0/0/0 to the LOS case’s Channel 1 Red.
  • Serial patch from Port 1 NRZ to Channel 1 Black (all on the LOS case).
  • FDMA modem and CTM-100/C installed as labeled in the STT.
  • KIV-7M installed as labeled in the LOS case, COMSEC loaded, and strappings matching the HUB.

CTM-100/C Configurations

The following setup will allow your CTMs to pull timing through your FDMA modem.

Mode Fiber Fiber
Rate <Provided in SAA> <Provided in SAA>
NRZ Mode EIA530A EIA530A
NRZ Clock ——- TXC
Clock Source Fiber Input
Status (when complete) <Rate> nF_ P_ L_ <Rate> Nf_ P_ L_

NT2R Configuration

  • Remove “passive-interface Loopback0” from the OSPF configuration.
  • Add a network statement to include the Hub’s NT2R (e.g. “network area 0”). The IP of the Hub’s NT2R should be visible in your routing table, as it is a directly connected network via Serial0/0/0 (shown in the yellow box below).
#show ip route
NT2R Routing Table


That should be it. If any additional configuration is required, it is Hub-specific and not something we came across. If additional help is required, I can be contacted via this blog (must use a .mil email address).

Next Post: Getting FDMA Working on a CPN

Normally, a WIN-T Battalion Command Post Node (referred to as either BnCPN or CPN) is configured to connect to the WAN via a TDMA satellite link. This is the way things are normally done and the way we are trained to make it work. However, the powers that be have decided to make certain CPNs “Super CPNs” by providing them with an FDMA modem, which is normally reserved for the JNN. This has been done for a while: another CPN at FOB Wolverine (where I was working in Afghanistan) had an FDMA link back in 2010. The only problem is that no one, or very few people, know how to make it work.

Well, we figured it out this morning. I have copious notes and will be posting a write-up for the benefit of fellow CPN operators and the CECOM FSRs who support us.