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General Hardware Specifications of Lenovo X1 Carbon model 20R2S0C500:

This laptop is operating under Kernel version 5.4.8-200

• Installing

dd if=Fedora-Workstation-Live-x86_64_31-1.9.iso of=/dev/sdb
install to disk
reboot
dnf update
reboot kernel 5.4.8-200.fc31.x86_64

• Post-Install modifications/tweaks

#BIOS settings
- Security -> I/O port access: Ethernet LAN -> disable (for now, need dongle)
   	      	     	       Wireless WAN -> disable
			       Securty Boot -> off (needed for unsigned kernel-ml)
	   -> Virtualization -> DMA kernel protection: off (allows Thunderbolt)
- Config -> Power: Sleep State -> Linux
  	 -> Thunderbolt BIOS Assist Mode: on (to save power)

#mic/speakers need work:
#build 5.4.8-200.fc31.x86_64 kernel (or newer) from source
  set all CONFIG_SND_SOC_SOF_* options, make, install, reboot
dnf -y install alsa-firmware
#Fn-volume-up shows "dummy output"
#https://bugzilla.kernel.org/show_bug.cgi?id=201251
cd /lib/firmware/intel/sof-tplg
mv sof-hda-generic.tplg sof-hda-generic.tplg.orig
ln -s sof-hda-generic-4ch.tplg sof-hda-generic.tplg
#https://bbs.archlinux.org/viewtopic.php?id=249900&p=2
#add to /etc/pulse/default.pa, in order: speakers, HDMI, USB-C, headpone, mics
  load-module module-alsa-sink device=hw:0,3
  load-module module-alsa-source device=hw:0,7 channels=4
#create ~/.pulse/daemon.conf: (needed for sharing computer audio in zoom)
flat-volumes=no
default-sample-format = s16le
default-sample-rate = 48000
alternate-sample-rate = 44100
default-sample-channels = 2
default-channel-map = front-left,front-right
default-fragments = 4
default-fragment-size-msec = 25
resample-method = speex-float-1
enable-lfe-remixing = no
high-priority = yes
nice-level = -11
realtime-scheduling = yes
realtime-priority = 9
rlimit-rtprio = 9
daemonize = no
#other experiences:
#https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_X1_Carbon_(Gen_7)

#gnome: suspend on lid close with external monitor, check:
systemd-inhibit --list --mode block
#not there:
#dconf-editor
#  org >> gnome >> settings-daemon >> plugins >> power
#  lid-close-suspend-with-external-monitor: true
#edit /etc/systemd/logind.conf
  HandleLidSwitch=suspend
  HandleLidSwitchDocked=suspend
  LidSwitchIgnoreInhibited=no
#edit /etc/UPower/UPower.conf
  IgnoreLid=true
#reboot and check
systemd-inhibit --list --mode block

#CentOS 8: wifi not working, requires 9560 driver compilation by hand;
#mic not working, lacks required dsp infrastructure in
#kernel, even if custom compiling a 5.x kernel, sof support missing
#Don't use CentOS for this laptop, Fedora is easier to set up.