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From: Thorsten Leemhuis <>
To: "" <>
Subject: Re: tboot suspend broken on Lenovo T460p #forregzbot
Date: Mon, 26 Sep 2022 15:37:06 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 29.04.22 14:03, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker speaking.
> About a week ago a regression was reported to that
> seems to be handled there already, nevertheless I'd like to add to the
> tracking to ensure it's not forgotten.
> #regzbot introduced: 453e41085183980087f8a80dada523caf1131c3c
> #regzbot from: Derek Dolney <>
> #regzbot title: tboot suspend broken on Lenovo T460p
> #regzbot link:

#regzbot backburner: fix available, but maintainer didn't pick it up and
developer of the fix is MIA for unkown reason

For details see:

Sigh. That's not how things should be, but happen anyway.

Ciao, Thorsten

> Quote:
>> I am using tboot (v1.10.5) to make use of intel-txt and all was
>> working fine with the Linux kernel 5.10 series. However later in 5.12
>> release candidates, I have  proper booting however suspend is broken.
>> I am using a Lenovo T460p. Usually when suspending on this machine
>> the power button LED will blink 8 times and then it goes into a sleep
>> state. With newer kernels I get power LED and caps lock LED blinking,
>> cpu fan runs fast, and can't get out of that state without hard
>> powerdown.
>> I did a git bisect on and found that commit
>> 453e41085183980087f8a80dada523caf1131c3c is the one that breaks
>> tboot+suspend to ram. It is part of a series of some cpu hotplug
>> commits.
>> Just to be clear: if I build a kernel from the commit just before
>> this one, I can suspend and resume, but if I build with this commit I
>> can not suspend, laptop gets stuck on blinking power LED. Let me also
>> mention that, given the above commit, if I do not use tboot, I can
>> suspend and resume ok. It is only within the tboot boot context that
>> I have suspend&resume problems.
> See the ticket for details, there were a few replies already.
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> P.S.: As the Linux kernel's regression tracker I deal with a lot of
> reports and sometimes miss something important when writing mails like
> this. If that's the case here, don't hesitate to tell me in a public
> reply, it's in everyone's interest to set the public record straight.

  reply	other threads:[~2022-09-26 13:37 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-29 12:03 tboot suspend broken on Lenovo T460p Thorsten Leemhuis
2022-09-26 13:37 ` Thorsten Leemhuis [this message]
2022-12-08  7:06   ` tboot suspend broken on Lenovo T460p #forregzbot Thorsten Leemhuis

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