linux-kernel - Re: Intel laptop: Starting with `maxcpus=1` and then bringing other CPUs online freezes system

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Message-ID: <20200611161758.GG30352@zn.tnic>
Date:   Thu, 11 Jun 2020 18:17:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Mario.Limonciello@...l.com
Cc:     pmenzel@...gen.mpg.de, tglx@...utronix.de, mingo@...hat.com,
        x86@...nel.org, linux-kernel@...r.kernel.org, hdegoede@...hat.com,
        ckellner@...hat.com, linux-pm@...r.kernel.org
Subject: Re: Intel laptop: Starting with `maxcpus=1` and then bringing other
 CPUs online freezes system

On Thu, Jun 11, 2020 at 01:13:27PM +0000, Mario.Limonciello@...l.com wrote:
> From some other similar reports I've heard this could be related to the ucode
> loading causing a freeze.  I would suggest trying to disable the Intel ucode
> loader with the initramfs as a debugging tactic.

There's a cmdline param for that: "dis_ucode_ldr".

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette