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3 Posts

07-03-2018

Germany

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-03, 10:47 AM

Just saw that BIOS Version 1.23 has been released. Did someone tried this Version and does it have an offical fix? Is it save to upgrade if one is using this script https://github.com/erpalma/lenovo-throttling-fix ?

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-03, 11:37 AM

I have BIOS 1.23 and it will basically foul up CPU heat management performance for good system-wide, but especially in Windows when charger plugged in. It fixes only Intel Latest Security Side-Channel Attack Bug, and if you ask me there is no end in sight until Intel managed to degrade CPU performances to nil. We are at 18nm now and their <10nm yield is much worse than expected, meaning they need new sales arguments and destroying performance of their current and old chips by software upgrades will do the trick. Think VW fuel scandal in reverse. Its all a giant joke. Don't install 1.23!

 

Moderator note: post edited to conform with Community Guidelines

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5 Posts

04-08-2018

Germany

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-08, 7:30 AM

It's version 1.25 for the X1C6 where they made things worse. 1.23 should still be ok.

 

https://www.reddit.com/r/thinkpad/comments/8vpenu/x1c6_w_bios_update_125_new_throttling_issues/

 

See changelog

- Fixed an issue where ThinkPad surface temperature is higher than designed.

https://download.lenovo.com/pccbbs/mobiles/n23uj08w.txt

 

 

 

For the T480s, the latest version atm is 1.23.

I've just applied it on my machine. It didn't change anything to max temp or max tdp though.

The fix in this thread is still working.

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2 Posts

07-06-2018

Netherlands

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-09, 20:54 PM

Thanks to @erpalma for the excellent lenovo_fix. It also fixes another issue I have on my X1 Yoga (3th gen).

 

For me the the CPU was suddenly throttled completely down to 400mhz after +/- 20 seconds of heavy load; the machine becomes completely unresponsive. After some time it fixes itself and increases back to about 1800mhz. Not sure why it is doing this?

 

(I can reproduce this by running "stress -c 8")

 

I've now limited to 30W PL2 and 10W PL1 and this seems to prevent the extreme throttling.

 

Does anyone else recognize this on the X1 Yoga? The temperature seems to increase very quickly under load.



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8 Posts

06-28-2018

United States of America

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-17, 3:08 AM

I too am having the same issue with dropping down to 400MHz -- I am thinking it has to do with BIOS 1.25 (since I upgraded as soon as I got the laptop, stupid mistake I guess). 

 

Was there a recent bios update that affected CPU temp on the Yoga 3rd gen?

 

EDIT: Even without the lenovo_fix systemd service running it still has the same issues. I have disabled power management in the bios (on the CPU) which stunts the CPU to 1.9GHz and it has stopped dropping down so low. It still drops but the top freq always stays at 1900MHz. It only dips to 1699 is the lowest I've seen. I also see the temp while running video conferencing, chrome, Stress (with s-tui) still staying at 76-77C. Power sticks around 15W. I don't get any adverse drops to 800MHz or even 400 MHz. 

 

It's unfortunate intel is really missing the mark with these CPUs. 

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8 Posts

06-28-2018

United States of America

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-17, 23:17 PM

Actually with real use at work today it sporadically dropped the CPU TO 400MHz for a few minutes to a few seconds. This is complete and utter terrible behavior. 

 

I am turning off all power stepping in the Bios and running at the static 1900MHz freq. We'll see if tomorrow I hit the same issues.

 

The CPU runs notably cooler (60-77C) when stepping is disabled. 

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8 Posts

06-28-2018

United States of America

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-19, 2:20 AM

Turning your bios CPU stepping out definitely uses more battery voltage but does keep the CPU t and frequency stable. 

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2 Posts

07-06-2018

Netherlands

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-19, 7:06 AM

Doesn't disabeling the CPU power management from the bios also disable turbo-boost? That would have a big impact on performance.

 

I've since switched to Manjaro (Arch) which fixes the issues with the touchpad I've had on 18.04 on resume from standby. With the fix described on https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_X1_Carbon_(Gen_6)#Power_management.2FThrottling_issues I also no longer have the extreme throttling problem on the Y3.

 

Quite happy now!

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8 Posts

06-28-2018

United States of America

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-07-19, 8:41 AM

Do you know what bios version your running (out of curiosity)?

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2 Posts

10-11-2018

Finland

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Re: [X1C6/T480s] low cTDP and trip temperature in Linux

2018-10-11, 17:23 PM

So apparently this still haven't been fixed? I can reproduce it on my Lenovo L480. Next im gonna try https://github.com/erpalma/lenovo-throttling-fix but this clearly is not the final solution. Disappointed with Lenovo's customer service.

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