Linux kernel regression on power usage
Solution 1:
The power management regression you are referring to was actually the Linux kernel learning to respect the BIOS when it says "these devices don't support PCIe ASPM". Now, sometimes (often!) the BIOS is wrong about this, but should your system start to randomly hang after forcing this option on, one candidate is that you've force-enabled a broken hardware feature.
- You can help test the fix by going to this wiki page.