Karim Vaes

After check the power usage of my HTPC setup I can conclude that:

• HTPC : Uses between 71 & 76 watt (3 watt when turned off)
  (100+ watt on bootup when the Cool’n'Quiet isn’t active yet)
• TV : This on uses ~117 watt when turned on (0 watt when turned off)
• TUNER : This one uses 5 to 7 watt when turned on, and 3 watt when turned off.

To put it in a nice table for easy comparision:

The HTPC uses about 50% of a normal pc, but it uses 10 times as much as my previous tuner. A CRT (+ speaker) would need the same amount of energy as my current TV, but an LCD would be cheaper (in energy usage).

References
Thanks to Stijn Bosse for lending me his power (wattage) meter.
Other readings were assumed by the following data.

XBMC offers native MythTV support from Revision 12173. It’s still pretty beta, but (in my eyes) it’s still working better than the python scripts.

The HOWTO
Add MythTV as a Video Source

• 1. Once XBMC is installed and running on your Xbox go to “Videos” and select “Add Source”
• 2. In the “Enter the paths or browse for the media locations.” field you will need to enter the properly formatted username, password, and IP information for your mythconverg database. This information should be prefixed with “myth://” and follow standard linux network access formatting of: “username:password@ipaddress”. For example, if your mythconverg database is located on a machine whose ip address is 192.168.1.116 and uses the username “mythtv” and the password “mythtv” you should enter the following:
  

  myth://mythtv:mythtv@192.168.1.116

• 3. Input a name for this source in the “Enter a name for this Media Source” field. This name is what will appear in the “Videos” list of XBMC.
• 4. Click on “OK” to add this source to the “Videos” list.

The ISSUE
The issue that I had was that my XBOX froze after selecting a channel. It was caused because my MythTV backend returned it’s hostname to the XBOX, which was unable to resolve (DNS) it. So I gave my backend a fully qualified dns name, which was resolvable and the issue was fixed. From now on, I reused my old XBOX (which was turning into a dust collector).

References
MythTV: Xbox Frontend
XBMC Forums

Today I was reading a post about biometrics on Johan’s blog. As the blog post is in dutch, I’ll be so free to provide a small translated excerpt from it:

Biometrics for authentication is fundamentally wrong!
Why?
Because it doesn’t fulfill the necessary requirements, like for instance “revocation”.

• If someone figures out your password, you have the ability to change your it.
  (and you don’t leave it lying around anywhere)
• If someone copies your bankcard, you can request a new one
  (and you don’t leave it lying around anywhere)

What will you do when they copy your fingerprint? And you DO leave your fingerprints lying around EVERYWHERE.

I already referenced multiple times towards the insecurity of biometrics:

• Mythbusters bust Fingerprint Security
• Fingerprint authentication & RFID Implants

But to show you that it isn’t really that hard to fake, check out this article! Which will show you that copying a fingerprint is about that easy than what they do in “CSI [insert city name here]” to retrieve them …

References
Biometrie voor authenticatie… (dutch)

Let’s talk about “Enterprise 2.0“.

The way we work is changing rapidly, offering an enormous competitive advantage to those who embrace the new tools that enable contextual, agile and simplified information exchange and collaboration to distributed workforces and networks of partners and customers.

Enterprise 2.0 is the term for the technologies and business practices that liberate the workforce from the constraints of legacy communication and productivity tools like email. It provides business managers with access to the right information at the right time through a web of inter-connected applications, services and devices. Enterprise 2.0 makes accessible the collective intelligence of many, translating to a huge competitive advantage in the form of increased innovation, productivity and agility.

Read the rest of this entry »

Being “Green” is being helpful towards the environment, but also to your electricity bills… The most commonly used techniques to reduce the power usage of a computer device are :

• Turning off your monitor/screen/tv when not used.
• Turning off the hard disks when they aren’t used
• CPU Frequency Scaling

For the last bit, you’ll have to check if you motherboard/cpu supports this… Most will probably support this, apart from the “really” old. The motherboard (& CPU) of my HTPC (MythTV) is capable of using AMD’s Cool’n'Quiet. I followed the following guide on the Ubuntu Forum, and used the “powersave” algorithm. It reduced my CPU frequency to 1000, where I must admit that I don’t notice anything on my combined MythTV frontend/backend. Next up is measuring the actual power usage, but I need to obtain a measuring device for that…

Extra
For an interesting readup on the same topic; check MythTV NZ, ThinkWiki’s How to reduce power consumption, …