Looks like you've edited /etc/default/grub with a kernel flag that may not be supported.
Try removing i915.enable_psr=0 from that file and trying again.
EDIT: Typos. I'm on mobile
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Looks like you've edited /etc/default/grub with a kernel flag that may not be supported.
Try removing i915.enable_psr=0 from that file and trying again.
EDIT: Typos. I'm on mobile
/usr/sbin/grub-mkconfig: 12: /etc/default/grub: i915.enable_psr=0: not found
This. Your /etc/default/grub file is probably not formatted right. That i915.enable_psr=0 param is probably on its own line, it needs to go in the kernel boot params line