Sleep

Firstly, check if your sleep works out of the box. If it works, you can skip reading this section.

The most common reason of broken sleep on AMD systems are USB problems.
You have to map your USB ports. If you have working Windows instance I recommend this tool, otherwise you have to do it manually.
After mapping remember to disable Kernel -> Quriks -> XhciPortLimit in your configuration file.

If map does not fix your issue you can try to patch _STA method of your USB controllers. Go to ACPI -> Add in your configuration file and set Enabled to true under SSTD-SLEEP section. By default this SSDT patches _SB.PCI0.GPP2.PTXH device. In most cases your controller will have another address.
You can find it with Hackintool - go to PCIe tab, then look for devices with USB controller value under Subclass. When you find address of your controller you have to open SSDT-SLEEP.aml with MaciASL and change addresses. If you have more than one controller you can try to patch _STA for every of them.

If USB fixes does not help, probably something another is broken. You can read more detailed guide about it on Dortania.