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ThinkTank480
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Posts: 31
Registered: ‎04-26-2018
Location: CA
Views: 11,698
Message 1 of 57

FYI - Linux May Not Support Thunderbolt Native Mode

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

ThinkTank480
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Posts: 31
Registered: ‎04-26-2018
Location: CA
Views: 11,530
Message 2 of 57

FYI - Linux May Not Support Thunderbolt Native Mode

I hope to receive a response about this soon.

 

A bug in the firmware is an important issue!

ThinkTank480
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Posts: 31
Registered: ‎04-26-2018
Location: CA
Views: 12,487
Message 3 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

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.

Arjov
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Posts: 47
Registered: ‎04-02-2018
Location: IT
Views: 12,382
Message 4 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

think this deserves some attention. 

ThinkTank480
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Posts: 31
Registered: ‎04-26-2018
Location: CA
Views: 12,051
Message 5 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

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

 

Again, there may be more.

changsta2004
SCSI Port
Posts: 79
Registered: ‎04-06-2018
Location: US
Views: 11,865
Message 6 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

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

wuga
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Posts: 69
Registered: ‎04-23-2018
Location: SG
Views: 11,840
Message 7 of 57

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

Administrator
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Registered: ‎09-03-2014
Location: SK
Views: 11,413
Message 8 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

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

Andy


English Community Leader


Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points


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CivIng
Paper Tape
Posts: 1
Registered: ‎04-03-2018
Location: SE
Views: 11,770
Message 9 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode

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.

wuga
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Posts: 69
Registered: ‎04-23-2018
Location: SG
Views: 11,724
Message 10 of 57

Re: FYI - Linux May Not Support Thunderbolt Native Mode


@CivIng 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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