HP Pavilion x360 Convertible, installing Linux, endless IRQ and logging loop

When installing a Linux OS (e.g. Mint) from a live cd or USB stick, editing /etc/default/grub does not solve the problem. You can add or edit a line like GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pci=nomsi" in /etc/default/grub, then running update-grub (which internally uses grub-mkconfig) will transfer that to /boot/grub/grub.cfg . But that becomes effective only after a reboot, and when you reboot a Linux live session (i.e. without having installed anything to hard disk yet), the live stick will reinstate its own Grub settings again, so you have the interrupt looping problem yet again. How to solve this?