@kaihengfeng I'll test and post the results soon. @anthonywong If I disable pstate with "intel_pstate=disable", frequency goes up to 1000Mhz max, also laptop runs very hot and battery lasts 30-60mins without pstate.
On Windows 10 CPU goes all the way to 4.1GHz so it's not a hardware issue. Linux kernel 4.17.3, 4.17.2, 4.17.1 are also working as expected (4.1GHz) without overheating and >3hrs battery. I would try 1st and 2nd link you posted but I don't have problem on win10. 3rd link is dell model specific but I've already tried that. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1838141 Title: intel_pstate not working. CPU frequency fixed at 800MHz. No cpu frequency scaling. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838141/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
