Hi all, I ran guix pull and system reconfigure today, updating my kernel to 5.19.12. On rebooting I was unable to get much past the bootloader before the screen started flashing. Aparrently there's a regression in 5.19.12 that couses this issue in some intel laptops. Because guix is guix I just rolled back for now.
This regression was fixed in the 5.19.13 stable release.