I changed mb, cpu. Black screen after grub

[hariskar]

I changed motherboard and cpu from Intel to AMD. Mb is B550 aorus elite and cpu is 5600G.
Grub loads normally, with correct resolution, I can boot Windows but not Gentoo..
I chroot in my system made countless kernel changes, started with defconfig and made changes again but nothing...
I enabled FRAMEBUFFER_CONSOLE, FB, FB_EFI, FB_SIMPLE.

Where should I begin? Any way to export logs, dmesg etc from chroot?

Thank you!

[logrusx]

Hello hariskar,

As a start dpaste or pastebin your emerge --info and your kernel config.

You probably need to do emerge -e @world too, but let's first get your kernel working.

p.s. I'm not sure if it's worth doing the above as opposed to grabbing your /etc/portage files, perhaps modifying make.conf to reflect your new CPU and performing a clean install. Preserve your user files of course. What I did when I did that transition was to first install the new system, then I used scp to copy my user files with additional options to preserve original crete/modify dates et.c, but I had two separate computers. I guess I could have used rsync for that too.

Best Regards,
Georgi

[hariskar]

Does this kernel problem seem to be because of cpu config? gpu config? grub config? Something else?

I can copy all files I need to 2nd hard disk and reinstall because I am struggleing already 2 days with black screen...


Thanks a lot for reply!

[apiaio]

Hi hariskar.

A few months ago I have changed desktop and booted the old Gentoo installation.
What I had to do:
- change ethernet driver support and audio support
- video cart support + edit make.conf
- enable NVMe support

Concerning grub. Your old Gentoo will want secure boot off. And also depends on boot option - BIOS or EFI

Good luck.

[irets]

If you want a bootable system a bit faster, you could install sys-kernel/gentoo-kernel-bin for the time being. Remember to grub-mkconfig afterwards.
You could then tweak your kernel afterwards from the comfort of your X11 session.

Depending on your old setup, you may need to flip the switch on your secure boot configuration in your new BIOS.
Recompiling your system with your new CPU after making changes to make.conf might be needed in some cases.

[logrusx]

[hariskar]

[Hu]

You can use wgetpaste to upload text files from the command line. It will print a short URL, which you then share here.

Since you did not get the correct kernel configuration automatically this time, it seems unlikely you will get a correct one automatically on a reinstall. However, if you use an all-purpose kernel that supports a wide variety of hardware, you might get what you want. This is what Irets suggested above.

[hariskar]

[hariskar]

I booted with kernel-bin, run lspci -k found running modules enabled i2c_piix4 and sp5100-tco and it booted!
Now I have no internet because network interface name changed from enp5s0 to enp3s0.

Thank you!

[logrusx]

[Hu]

If the new processor understands all features that the old processor understands, then recompiling is not necessary. If the new processor lacks some features that the old processor understands, and those features are used in a package, then that package needs to be rebuilt. In particularly unfortunate cases, the package that needs a rebuild may be broken until rebuilt and also be necessary in order to rebuild itself.

The output of resolve-march-native from both processors would let us determine whether the new processor is a superset of the old one. However, if you did not compute that before swapping out the hardware, collecting that output from the old processor now could be difficult.

[hariskar]

New processor has all CPU_FLAGS_X86 the old processor had plus two more. So do I need to emerge -e @world?
Thank you!

[Hu]

We need to see what gcc interprets -march=native to mean, for both CPUs. CPU_FLAGS_X86 is not definitive. If we cannot get that, knowing the exact model of each CPU would let us check the manuals to make some estimates. Alternatively, you could choose to ignore the problem until you see evidence of the issue, in the form of reproducible Illegal instruction errors.

[logrusx]

[hariskar]

Previous cpu was haswell and this is znver3.

I run emerge -e @world, it doesn't last too long with this cpu. Thank you!