Ryzen 5 3400g display problems

[Jjfire]

I have a new build with an Asus B450m and a Ryzen 5 3400g. I had to boot the live usb with safe graphics mode to be able to install. In order to be able to get it to boot past the mobo splash screen I have to go into grub and use nomodeset. I upgraded the kernel to 5.10 and still am unable to get it to boot normally. What am I missing. HELP.

Jamie

[oshunluvr]

A web search reveals: https://askubuntu.com/questions/1239...en-5-3400g-apu

[Jjfire]

A web search reveals: https://askubuntu.com/questions/1239...en-5-3400g-apu

Hey, I appreciate your help. I have seen that article before. For the life or me I can't find where to disable the iommu in my Asus bios?

Jamie

[GreyGeek]

You don't need to change your BIOS. The link gave the following advice:

[h=3]Workaround 2:[/h] Add iommu=pt to command line in /etc/default/grub following the steps below.
 [LIST=1][*]Run
 sudo nano /etc/default/grub
[*]Make the GRUB_CMDLINE_LINUX_DEFAULT line look like this
 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=pt"
[*]Update grub by
 sudo update-grub
[*]Reboot with
 sudo reboot[/LIST]

[oshunluvr]

Yeah, some BIOS have more settings than others. Linux has a crap-ton of command line kernel switches like the one GG and the article pointed out. Can't hurt to try this one.

If you want to test it without the edits, you can add it via the GRUB editor at boot time and see if it helps.

If your mobo and chipset are brand new they might not be totally supported by the kernel yet. However, you state you've installed kernel 5.10 which is not yet supplied by Ubuntu AFAIK. Therefore, you have gone "off the ranch" so you might just be on your own on this one.