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I need to enable Kernel Modesetting in order for my video card to be used with the amdgpu driver, but I have this new Lenovo IdeaPad laptop that won't boot unless I boot the kernel with the nomodeset option. Is there anything I can do to debug KMS support for this hardware? It's a Lenovo IdeaPad 320-15ABR. Kernel version is 4.14.0-rc1.

And here's the VGA device info:

$ lspci -nn | grep VGA
00:01.0 VGA Compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Carrizo [1002:9874] (rev c8)

Alright,
I've gotten this laptop booting with kernel-modesetting support, and the amdgpu drivers are now being used.

I followed the steps in Gentoo's wiki: https://wiki.gentoo.org/wiki/AMDGPU

I'm not sure which of the following changes were required, or if they were all necessary but what I did was:

• Enable "Build HDMI/DisplayPort HD-audio codec support" in my kernel


• Disable the ATI Radeon param in my kernel


• Included all the carrizo firmware files directly into my kernel


• Remove ati and radeon modules from /etc/initramfs-tools/modules
  


• Blacklist the radeon module in /etc/modprobe.d
  

For some of these steps, you can see more detail in the gentoo wiki page linked above.

After all that, I removed the options quiet, splash, and nomodeset from my grub kernel params, and my display didn't hang anymore! Xorg.0.log confirmed the amdgpu drivers are now being used.