No Audio over HDMI and /system not mounting as rw:

[rsbuffalo]

Running Linux Mint 19, grub customizer boot sequence is: insmod part_gpt search --file --no-floppy --set=root /androidx86/system.sfs linux /androidx86/kernel root=/dev/ram0 androidboot.selinux=permissive CMDLINE SD=/dev/sda2 initrd /androidx86/initrd.img

Version Android-x86 8.1-r2 released boots and runs when selected. However, on HDMI, Card 0 with Device 2 (C0D2) is written in the file /etc/init.sh and my HDMI is C0D3 on the andriod device. I know how to fix, but can not make the android /system rw. Second question is how to add a writable /system in the boot sequence above in grub customizer on Linux Mint 19. I've adb shelled onto android x86 and used terminal on the device itself with no luck remounting thru terminal with numerous commands. This problem has show-up with my cpu on all android 8.0 and greater. I'm running older versions of Android x86 on the same computer with HDMI working just fine. Please help...