Originally Posted by Higgsboson
The radeon sound card has a particular problem which is solved by adding its name to grub.cfg in /boot/grub
Congratulations on solving this.
Note that grub.cfg should not be edited by hand. It'll be overwritten by your system the next time you run update-grub. This in turn will be run automatically sometimes (when the system update includes a kernel update).
If it is a kernel parameter you added you can make the change permanent by editing the parameter GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub and then running update-grub (as root).