Comment 58 for bug 1798961

I've had these freeze issues for a while, and I've been following this thread for a while (comment #42 helped, though I still have occasional freezes).

Googled "Fedora random freeze" today and found this: https://fedoraproject.org/wiki/Common_F28_bugs#Certain_laptops_.28Lenovo.29_hang_randomly

Apparently an issue in Ubuntu also: https://www.phoronix.com/forums/forum/software/desktop-linux/1020821-fedora-workstation-28-is-shaping-up-to-be-another-terrific-update?p=1020982#post1020982

And the timing of these bugreports/comments coincides with when these freezes started affecting me...

Long story short, we can try adding `ahci.mobile_lpm_policy=1` or `ahci.mobile_lpm_policy=0` to the kernel options in grub. Supposedly confirmed to help Lenovo G50-80, X250 and T450s. We have a G40-80 and T470s affected on this thread, and mine's a Lenovo G500s (similar to G50-80). Maybe it'll help? (praying that it helps)

It's possible that these freezes have multiple causes, and won't be completely fixed even if the workaround helps at all.