(In reply to Oliver Neukum from comment #12) > Could you please test the current distro kernel with the cstate limit? I've used the distro 4.1.26-21-default for 10 days now WITHOUT the cstate limit. Originally I've decided to give it a try without the limit, until the first freeze. But, I love it, not one freeze with 4.1.26-21-default. Tested with high USB HDD i/o - no freeze. Only thing changed is the fs on my usb hdd: switched from ntfs to ext4, as the kernel crashes always corrupted ntfs. Going now to 4.1.27-24, offered as security update. I've the strong feeling that my bug has been fixed somewhere on the way to 4.1.26-21, let's see...