I've played with my router all that I know how to: changing to either B, G or
N only modes, mixed modes, channel width frequency set to 20mhz instead of
auto, tried different channels and the results are all the same with the
internal wifi. Throughout those I gave the TP USB dongle speed tests as well,
and it's holding steady at much higher speeds. So I can rule out the router
as the culprit.
I've tried booting the T400 with a live disk of Mint 18 in case it had
different drivers, but it loads the same wifi driver.
I'm next going to see if I can learn about configuration settings. Maybe
there's something I can tweak. I've noticed others across the web lamenting
about slowness for that particular chipset in different laptops, and for some
a kernel update solved it, but those updates were for 2.6 updates, and this
T400 with Trisquel 7 has 3.x versions.
Maybe it's just the nature of the thing, but can you do wifi speed tests on
other T400s in stock to see if they behave the same way? I'm curious to see
if they can beat 400 kilobytes/s download speeds.
