Re: TSC problems with Acer TravelMate 5735Z

From: Peter Zijlstra
Date: Sun May 24 2020 - 14:58:37 EST

On Sun, May 24, 2020 at 07:09:18PM +0200, Paul Menzel wrote:
> Dear Linux folks,
> I got my hands on an old Acer TravelMate 5735Z (Intel GM45/Cantiga) and
> installed Debian Sid/unstable with Linux 5.6.7 on it.
> Booting the system it takes a long time, and the systemd units fail to
> start. The logs contain that the TSC is unstable. Adding `tsc=unstable` to
> the Linux kernel command line fixes this.

It fixes nothing; it just doesn't get you the warning because you told
it upfront.

> Do you have an idea, what might cause this?

Yes, but you didn't include the dmesg of the affected case. IIRC it
actually spells it out for you.

> Do you have an idea, what might cause this,

It's a Core2, Core2 doesn't have stable TSC.

> and how it can be fixed?

Use a 'better' CPU :-)