Did you tried to downgrade the firmware ?
Steps from hans12 :
Here are your steps:
pacman -S yay #(or install similar AUR-tool if not already installed)- optional:
yay -Syu #(will update your system)
yay -S downgrade #(install downgrade)sudo downgrade --ala-only linux-firmware- select option from march (36) or earlier
- optional:
[Y] set linux-firmware on ignore list, to prevent future updates
- optional: reboot to immediately apply changes
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