This patch contains an expression for linux-samus kernel [1].

I've been using it for a few days and had no major problems so far.
Specific lines in configuration.nix the one might want to add are the following:

services.xserver.wacom.enable = true;
services.xserver.synaptics.enable = true;

boot.initrd.kernelModules = [ "i915" ];

boot.extraModprobeConfig = ''
  options snd_soc_sst_bdw_rt5677_mach index=0
  options snd-hda-intel index=1
'';

The sound can be controlled by the following instructions (without -D pulse as in original instruction):

amixer -q sset Master toggle
amixer -q sset Master 5%-
amixer -q sset Master 5%+

I have a problem with suspension: the led doesn't change it's colors and the touchscreen stops working after wake-up.
mxt-app doesn't seem to help here, so I turned it off:

services.logind.extraConfig = ''
  HandleLidSwitch = ignore
''

PS. I don't think we should build it in hydra, since there is not so many users and the build process takes about one hour on this laptop.
PPS. And again, many thanks to @abbradar for assistance in this pr!

[1] https://github.com/raphael/linux-samus