Well, upstream Linux accepted a patch marked as a "security fix" from Intel to "fix graphical corruption with RC6", which actually "fixes" the issue by disabling RC6 entirely, which means the graphics chipset never powers down, which means that the CPU package never powers down either, causing your laptop to guzzle battery power, even at idle when the graphics should be in low power mode. Without RC6, the CPU package never even enters "PC2", and there are 8 package power states on these things. I'm assuming that Intel has done something similar on Mac and Windows, and people will just have to wonder why their 7 hour battery is now 4 hours. I reverted to Linux 5.3.10, which was the last kernel without the patch, and I'm trying to look into finding a Linux distribution that backed out the patch. So thanks to all of these Intel chip bugs that I've had to back out, my Linux command line looks like a Christmas tree -and- I'm using an old kernel. The Meltdown/Spectre crap was too horrible to live with because it slowed some things down by up to 30%, and this RC6 mess costs you over 40% of your battery life -and- 5% of your graphics performance. BUY AMD!