tested hardware

UPDATE: New Battery Pack!

Laptop Akku fรผr Lenovo ThinkPad T440 X240 T450 T440s T450s X250 X240s 4400mAh

yes it is thicker – yes it will make your laptop heavier… but it will run for 6 HOURS!

it comes with a manual that says: battery comes pre charged 70%, consume to 10% than charge to 100%, then consume to 10%… do this 4-5x times for battery to reach maximum capacity ๐Ÿ™‚ NEVER LET IT REACH 0%!

how do you measure the performance of a battery? of course by runtime! diabled all energy savings (display sleep etc.).

cat /scripts/count_seconds.sh 
echo "Seconds counter:" > count.log
while true; do
sleep 1;
echo $COUNTER" Seconds...";
echo $COUNTER >> count.log;

23927/60/60 = 6.64HOURS OF RUNTIME! NICE!

first of: it was bought at https://shop.delwi-itr.de for 300โ‚ฌ bucks and ideal linux boots and works like a charm.


  • 14″ screen, 13″ is to small, 14″ is reasonable, while the screen is often the part that uses most of the energy, so smaller screen = longer battery lifetime
  • the battery is quiet slim, but you can get 3x times the battery life with a 6 cell battery for around 50โ‚ฌ
  • big touchpad, two-finger-scroll works perfectly with ideal linux (Debian) ๐Ÿ™‚
    • the touchpad is big, but it is not triggered accidentally while typing.
  • slim design
  • 2x cores 2x threads (looks to OS like 4xcores) i5@2.9Ghz and 8GB RAM, 256GB SSD, that handles ideal linux with ease (any cpu core goes barely beyond 10% while firefox loaded)
  • the keyboard feels okay… it is pretty comfortable, has a two-level dimming backlight, and an green LED inside the FN (function) button.
    • you can activate the keyborad backlight with “Fn+Space” pretty cool ๐Ÿ™‚
    • the “print” button is located very closely to space bar… okay why not.
    • what is missing is a “right-click” button
  • webcam integrated webcam with decent quality 1280×720


  • a mouse click on this touchpad means to press the whole touchpad… this feels sluggish and makes a lot of noise, that could have been solved more elegant.
    • i know understand this design decision: you can now mark text by holding the whole touchpad “left mouse button” down and sliding over the touchpad in order to select text ๐Ÿ™‚ interesting ๐Ÿ™‚
    • this was probably also done, to avoid accidental touch pad interaction while typing on the keyboard (and the thumbs almost always touch the touchpad)
      • i understand this is very tricky… and i like big two finger scroll touchpads… but to avoid accidental interaction and allow easy right mouse click would be nice
  • also right-clicking with the touchpad takes some time to get used to. (it only works if you press the top right corner of the touchpad)
  • when looking at gray parts of the screen i believe to see “dots” and “stripes”



it is a fast machine.

it works great with the stick.

but the sluggish touchpad and the 30min of effective battery life makes an almost perfect laptop.

this blog post was written with ideal-linux on a stick booted on lenovo t440 ๐Ÿ™‚

linux lspci dmidecode hardware info script results:

here are the resultsย LENOVO-t440-20B7A1H4IX.txt

of the “hardware info and detection” script hardware_info_script.sh



with every boot stick there comes a script, that asks if you are happy with how the stick performs on your hardware:


here is the result of the script:


please support Debian and Open Source software and buy the ideal linux boot stick ๐Ÿ™‚ (also good present for still-microsoft dependant users)

pros: wifi works out of the box (just have to switch the hardware switch on which is on the front)

performs well… fast startup.

cons: no touchpad, just a “joystick” kind of nob.

i don’t neet that fingerprint sensor X-D