first of: it was bought at for 300€ 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 50€
  • big touchpad, two-finger-scroll works perfectly with ideal linux (Debian) 🙂
    • 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 🙂
    • 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 🙂 interesting 🙂
    • 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 (there is a very nice 5-6h battery upgrade scroll down 🙂 )

this blog post was written with ideal-linux on a stick booted on lenovo t440 🙂

linux lspci dmidecode hardware info script results:

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

of the “hardware info and detection” script


does your lenovo have keyboard backlight / background lighting?

it was the question of an angry user in some lenovo forum, with a closed threat so i can not even answer on it, here is the answer:

lenovo t440 with this symbol on the spacebar you can press Fn + Space to switch on (level1, level2, off) keyboard background lighting – your lenovo has no such symbol?

you can try it anyway but i guess you are out of luck and your lenovo laptop does not have keyboard background lighting (very sorry, it is really a cool locking feature, all lenovos should have these)

UPGRADE UPDATE: New Battery Pack!

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

Laptop Akku für 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!

update: further optimizing runtime of laptops/notebook via powertop 🙂

did that and it reports now 11hours of runtime, BUT i am experiencing harddisk access “hickups” meaning: whenever i try to open or save something i experience a massive delay of 10seconds or more.

my systemd file for t440 is like this: powertop.service.txt

(Operating System: Debian GNU/Linux 9 (stretch) Kernel: Linux 4.9.0-8-amd64)

if you have any recommendations let me know.

so be careful with those tunings.

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 🙂 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/ 
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 for 300€ bucks and ideal linux boots and works like a charm.