Before you go into the hassle of custom-built kernel (which might do you good anyway), you can try some more boot options to either debug the problem or maybe even boot successfully. Here are some that I'd try:
One simple trick you might use is to just run your Mint on the Gentoo kernel. To do that, you must copy files from two locations:
/boot/ (where the kernel and initrd reside) and
/lib/modules (where all the modules of each kernel are kept). The command
uname -r, run from the working gentoo system, will indicate the appropriate files/directories you will have to copy to your Mint partition.
If you end up building your own kernel, mind two things:
- You cannot just use the kernel configuration from your working gentoo kernel with the sources from Mint (I'm referring to the configs you've pasted) - because they refer to different kernel sources. If you really want the gentoo configuration with Mint kernel, you can try to use the gentoo config file with the same or newer version of kernel sources from Mint. Then, you should copy the gentoo config tou your Mint sources directory, naming it
.config and first of all run
make oldconfig before doing any manual configuration.
- In case you might run into ACPI problems in the future, make sure to enable ACPI debugging (
CONFIG_ACPI_DEBUG option) and read about using it in
<your_sources_dir>/Documentation/kernel-parameters.txt and other files referenced from there.