Blacklist Nouveau permanentely and no sound hda-intel

["Marco Menne" via <help-guix@gnu.org>]

Hello together, this is my first post in your mailing list.

I searched a lot in the net but did'nt find an useful answer for Guix system.
I know to blacklist the nouveau graphics driver on boot but how can I blacklist it permanentely?
My second question is about the hda-intel sound driver. 
I have hda-intel and nvidia-hdmi sound modules. On Slackware I cloud blacklist the Nvidia driver and could get the intel driver working.
But as in Guix system there is no /etc/modprobe.d/ folder I don't know how to get my sound working.

cat /proc/asound/card*/codec* | grep Codec
Codec: Nvidia GPU 84 HDMI/DP

sudo dmesg | grep -i snd_hda_intel
[ 29.243097] snd_hda_intel 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040380
[ 29.243111] snd_hda_intel 0000:00:1f.3: Digital mics found on Skylake+ platform, using SOF driver
[ 29.243171] snd_hda_intel 0000:01:00.1: enabling device (0000 -> 0002)
[ 29.243267] snd_hda_intel 0000:01:00.1: Disabling MSI
[ 29.243270] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 29.725366] snd_hda_intel 0000:01:00.1: bound 0000:01:00.0 (ops nv50_audio_component_bind_ops [nouveau])

lspci | grep -i audio
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
01:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio Controller (rev a1)

Any advice would be great.
--
Mameka