I wish to help other Razer Blade owners installing AL with this thread.
I will update this post with the different installation issues encountered on my Razer Blade Stealth 2018 and their solutions.
Firstly, I will mainly target installation//hardware related issue here. If you have software issues you should check other tutorials.
If you have some doubt regarding some resolution, I’ll gladly try to respond to the best of my knowledge.
Nevertheless, please, check the links below and/or on the internet prior posting questions. I won’t hesitate to respond with lmgfy links to obvious ones.
This won’t be an exhaustive list… If you manage to resolve some of your problems, please comment so that I can update this post. Or, even better, make your on post following this kind of model concerning your machine (Sadly I can’t own all Razer laptops. Or can’t I… I should try becoming a reviewer maybe).
Finally… I’m not (yet) an Arch guru, so my solutions may certainly not be the best - by far, feel absolutely free to comment if you have a better idea//understanding of what is going on.
Model: Razer Blade Stealth 2018 - i7-8550U Kaby Lake
AL iso used: 2020.04.17-beta
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] ERROR CPU pipe A FIFO
Well known with recent kernel and Kaby Lake architectures it seems…
Adding kernel launch option
intel_idle.max_cstate=4worked for me
- One should refresh mirrorlist right after connecting to internet in the installer (ctrl-z)
reflector --score 100 -l 50 -f 10 --sort rate --save /etc/pacman.d/mirrorlist --verbose
Partition / too full- before/during al-installer 
Extending cowspace size seemed to resolve the issue, depending of what you want right away during install you might need to extend it up to 5-6G
-Kernel launch option:
mount -o remount,size=xG cowspace
Issues to address:
- Separate partitions for root, home [, eventually swap]
- Wireless card
- Handling Hibernation properly
- On-the-fly external screen
- Correct keyboard mapping (it’s laking for now… but probably just the right keymap who’s missing)