After some perusal with apt-rdepends, it's something like this:

passwd -> adduser -> libibverbs1 -> ibverbs-providers -> libfabric1 -> libopenmpi40 -> libhdf5-openmpi-310 -> libadios2-mpi-core-2.11 -> libadios2-mpi-c++-2.11 -> libvtk9.5 -> libopencv-viz410 -> libopencv-viz-dev -> libopencv-dev

There has to be a longer dependency chain somewhere, but would it even be possible to find?

@GyrosGeier @adapalmer @thinkpadmuseum @xtaran they always put the FN key there.

See the PS/2 Note N33sx: https://muzeuldecalculatoare.ro/2016/10/18/ibm-ps2-note-n33sx-type-8533-before-the-thinkpads/

It being in the corner also meant you could turn on the ThinkLight(tm) easily because it was "bottom left" + "top right"

@gridbugs off the top of my head,

* turn off fax awareness
* turn off echo cancellation
* turn off anything that sounds like dynamic jitter compensation; set it to manual and the highest setting, if possible

I can somewhat reliably get 28.8k on a SPA8000 -> Cisco 3745 and those were the key settings.

I would also check that your phone line settings are right (regional variations like dial tone) but not sure if those are your problem.

@whitequark my current personal beef, for:

* NDA'd datasheets, for everything
* Garbage WiFi chips
* Upstream kernel support for their SoCs (Great!) but somehow are un-bootable on commercial boards (maybe this is a skill issue)

Marvell! Even their SATA <-> IDE bridge chip datasheet is NDA'd