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34 Posts

04-27-2018

Canada

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FYI - Linux May Not Support Thunderbolt Native Mode

2018-04-27, 7:20 AM

Hello,

 

The T480s has a bug in the ACPI tables.

 

The bug causes heavy CPU usage on one thread due to frequent ACPI interrupts.

 

The symptoms are a slow system, and high CPU temperatures (idles at 65 Celsius).

 

The following circumstances trigger it:

-powering on the laptop

-waking from suspend (and possibly hibernate - untested)

 

The following actions prevent it:

-reboot the laptop (temporary fix)

-disable thunderbolt in the UEFI settings (permanent fix - as of UEFI v1.11)

 

The changelog for the UEFI update v1.11 makes explicit mention of this bug:

 

"<1.11> UEFI: 1.11 / ECP: 1.07

-(Fix) Fix an issue where system may become hot by system interrupts when Thundrebolt is disabled in ThinkPad Setup - Security - I/O Port Access."

 

Unfortunately, the bug still exists while thunderbolt is "enabled" in UEFI settings.

 

I believe I have found the specific code that is causing this bug, as well as the solution.

 

I would like to get in touch with a Lenovo engineer in order to help them resolve this issue.

 

Thanks!

 

Admin note; subject edited for relevancy

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7251 Posts

10-29-2009

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-31, 12:02 PM

ThinkTank480

 

Thank you for your additional information.  It's the first time I heard that you're not using Windows.  Please check whether the following BIOS setting can avoid the behavior you're reporting with OpenBSD:

 

BIOS Setup -> Config -> Thunderbolt ™ 3 -> Thunderbolt BIOS Assist Mode = Enabled

 

See the help text.  This setting must be Enabled to support Linux and older Win10 versions.

 

 

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34 Posts

04-27-2018

Canada

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FYI - Linux May Not Support Thunderbolt Native Mode

2018-04-30, 1:03 AM

I hope to receive a response about this soon.

 

A bug in the firmware is an important issue!

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34 Posts

04-27-2018

Canada

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-03, 23:05 PM

Hello,

 

There's a bug in the ACPI tables that affects all of the machines listed in the title.

 

The bug causes heavy CPU usage on one thread due to frequent ACPI interrupts.

 

The symptoms are a slow system, and high CPU temperatures (idles around 65 degrees Celsius).

 

Some operating systems may mitigate the symptoms, but the bug is present regardless.

 

The following circumstances trigger it:

-powering on the laptop

-waking from suspend (and possibly hibernate - untested)

 

The following actions prevent it:

-reboot the laptop (temporary fix)

-disable thunderbolt in the UEFI settings (permanent fix - with latest UEFI updates)

 

The official UEFI update changelogs for all of these machines make explicit mention of this issue:

 

"-(Fix) Fix an issue where system may become hot by system interrupts when Thundrebolt is disabled in ThinkPad Setup - Security - I/O Port Access."

 

Unfortunately, the bug was not actually fixed. The solution that was implemented is only a bandage for the "disabled" thunderbolt state.

 

This patch should resolve the problem.

 

This patch would then remove the bandage of the official fix, since it should no longer be necessary. I will leave that for your engineers to decide.

 

This patch would prevent an issue where my head shakes back and forth every time I see this block of code.

 

These patches were made for the T480s, but should apply equally to all affected machines.

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50 Posts

04-02-2018

Italy

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 0:31 AM

think this deserves some attention. 

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34 Posts

04-27-2018

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 4:07 AM

Based on the UEFI update changelogs, this also affects the X1Y3, X280, P52s.

 

Again, there may be more.

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100 Posts

04-06-2018

United States of America

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 5:28 AM

Has anyone who tried this yet? Results + viable for X1 Carbon?

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76 Posts

04-23-2018

Singapore

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  • Message 7 of 58

Re: ACPI bug - affects X1C6, T480s, T480, T580, possibly more.

2018-05-04, 5:42 AM

It doesn't seems the permanent fix solved X1C6 problem --> https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X1-Carbon-6th-gen-Fan-Noise/m-p/4065219/highlight/true#M85167

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11980 Posts

09-04-2014

Slovakia

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 6:04 AM

Thanks for posting this, I've passed the information along to engineering.

 

Andy

 

Community Administrator
Lenovo eServices

Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points 
Did you find a post helpfull? You can thank the member by awarding them a Thumbs Up
 

Please don't ask me questions by Personal Message; questions belong in the forums.


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1 Posts

04-03-2018

Sweden

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  • Message 9 of 58

Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 6:27 AM

Got this issue too. Haven't been able to test the fixes but will when I get back on my X13 yoga.

 

I'm always worried by longletivity of products when they are at a 100% state.

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76 Posts

04-23-2018

Singapore

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Re: FYI - Linux May Not Support Thunderbolt Native Mode

2018-05-04, 6:59 AM

 wrote:

Got this issue too. Haven't been able to test the fixes but will when I get back on my X13 yoga.

 

I'm always worried by longletivity of products when they are at a 100% state.


Yes, sometime i feel like my laptop is going to explode soon due to the heat...

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