Old AMD switchable graphics system (Southern Islands) help

[drachir]

Hi!

My main computer is an old laptop (Lenovo IdeaPad G510) with a Haswell Core i7 CPU (Intel HD4600 iGPU) and an AMD R7 M265 (Souther Islands - OLAND) dGPU.

I have some problems with the switchable graphics on this system. Tried searching for solutions on the Gentoo Forums and through Google but anything I've found was quite old information and no clear solutions (also nothing about my specific form of "failure".) First, I'll list some assumptions I had, so you can correct me if I'm wrong:

• The old radeon driver has the "stable" support for these cards, but it doesn't have Vulkan support, so no joy if I want to run games on the laptop.
  
• The new AMDGPU driver only has experimental support for my card, but in theory it should work correctly most of the time, and Vulkan support is also available, so this is the way for gaming.
  
• I don't need the AMDGPU-PRO driver / it would even be detrimental for my use case (running games mainly through Proton and Wine.)

So I made a custom kernel config (dist-kernel with config.d snippets) that disables radeon and bakes into the kernel the i915 and amdgpu drivers (so not using them as modules right now). Also made sure to bake the needed firmware files into the kernel. This seemingly worked as intended but 2 issues still persist and I can't find the solution:

• The AMD dGPU will become unresponsive after a time (not a set time, sometimes it's 5 minutes, sometimes a few hours). I mean with this that it doesn't "wake up" when requested, games won't launch,

  Code:

  DRI_PRIME=1 glxgears

  simply segfaults, and 'amdgpu_top' doesn't see the card anymore. It resolves itself after a full restart.
  
• The processor and memory clocks of the GPU sometimes freeze at 300/300 MHz and don't scale with load (should go to 750/900.) This doesn't resolve itself with restart but will get "unstuck" by itself randomly, so I just need to restart my games a few times until it's okay.

I'd like to resolve the above issues because they're very annoying (especially the first since it needs a reboot and it's really random chance when I want to launch a game whether I still have my dGPU or not.)

Also, Wine and Steam likes to bombard me with the following warnings:

[Ralphred]

I know that DRM_AMDGPU_SI and amdgpu.si_support=1 are always mentioned within the context of "make sure the right driver is loaded", but I'd include them (in the kernel .config and on the kernel command line respectively) and see if anything changes. amdgpu.dc=1 can be set for GCN1.1+ too, but the database I use doesn't show 1.1 as a thing, so maybe it should read 2.0+? EDIT:It's in the kernel though

[drachir]