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Benji96
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Posts: 1,256
Registered: ‎06-19-2019
Location: DE
Views: 678
Message 11 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

What you actually need to do is to downgrade the BIOS to the version that has been posted by a staff member as this is a BIOS fault.

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Lenovo Yoga 530-14ARR (81H9003VGE)
sztylah
What's DOS?
Posts: 2
Registered: ‎08-14-2019
Location: PL
Views: 555
Message 12 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

Same problem here on Lenovo Yoga 530s-14ARR.

Faulty BIOS: 8mcn52ww

I have just flashed my laptop with 8mcn50ww, I hope it will make the problem go away...

Benji96
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Message 13 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

You have a Yoga 530S and use the 8MCN version? 8MCN BIOS versions are for the Yoga 530, not for the Yoga 530S. You should be having the 8PCN versions. Plus, what you could also try is upgrade the drivers. The latest BIOS for your device has, by the way, been released yesterday. It is version 8PCN55WW. I also had that problem with my regular Yoga 530 once, but what fixed it for me was just unplugging and replugging the AC power and rebooting. As far as I know, the problem has already been fixed. In my case, I think it was a driver issue (I was playing around with the Energy Management driver).

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Lenovo Yoga 530-14ARR (81H9003VGE)
sztylah
What's DOS?
Posts: 2
Registered: ‎08-14-2019
Location: PL
Views: 504
Message 14 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

You are correct, I do have Yoga 530.

Currently running 8mcn50ww.

Replugging the power cord did the trick for me too but since the BIOS was faulty I have downgraded anyways.

Benji96
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Message 15 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

Ah, okay. Good to know that my solution also worked for you.

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Lenovo Yoga 530-14ARR (81H9003VGE)
melihb
Punch Card
Posts: 11
Registered: ‎03-21-2019
Location: US
Views: 391
Message 16 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

This literally solved the problem right on the spot. I have witnessed the clock ramping up the moment I unplugged the power cord on task manager.
I had tried restarting several times and disabling fast startup option in windows power settings as suggested but never thought the answer would be this stupid. Developers really messed up the bios for real this time.

I experienced the exact same story: my batterly level went low on usage (less than 10% in my case) and observed severe throttling until battery depleted. Then plugged in and left to charge but throttling did not stop until I tried unplugging the power cord.
I really liked the new bios (8PCN55WW) because the previous ones had excessive thermal throttling at 60 C clocking the cpu down to 1.6-1.4 GHz range. This one allows to reach higher temperatures like 70 to 90 C and keeps the clocks at advertised 2.0 GHz, besides applications like some games get massive performance boost because of it. Just so funny how they can mess up simple things like this.

boi87
Paper Tape
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Registered: ‎02-14-2018
Location: GB
Views: 377
Message 17 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

 


@Linainvers wrote:

I found the problem!

When the laptop is discharged less than 20% and we connect the charging, the frequency is blocked at the 0.4Ghz.

Even if the laptop is 100% charged, the frequency still blocked at the 0.4Ghz.

To solve this problem, you need to disconnect the charger from the laptop and connect again

Man!! Thank you so much. I'd never believed it worked but it did. Plug out, plug in, laptop speeded up immediately. Thanks so much.

This doesn't explain why though. this is a BIOS bug that shouldn't be happening. Is this the AMD processor fault? Or Lenovo's laptop?

Thanks man, everytime I was hitting 20% I had to stop working and restart a thousand times!

 

BIOS version here: just updated to 8PCN55WW few weeks ago.

 


Can someone enlighten me on how to rollback to version 8PCN50WW? Never did a BIOS downgrade. Thanks!

melihb
Punch Card
Posts: 11
Registered: ‎03-21-2019
Location: US
Views: 362
Message 18 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

It is hard to figure out which component at fault but this bug seems to be specific to ideapad 530s and its yoga equivalence so I guess it is the bios code so if you revert back to an older version of bios then it also solves the problem permenantly.

Benji96
Bit Torrent
Posts: 1,256
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Message 19 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

The fault is just a misconfigured BIOS, I have also seen comments about devices like the MIIX lineup with Intel Core 7th Gen CPUs showing the same behaviour, so it is probably - yet again - Lenovos "prowess" in writing BIOSes, not necessarily the chip itself. Downgrading the BIOS does seem to be the only fix, though.

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Lenovo Yoga 530-14ARR (81H9003VGE)
Sebastian737
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Posts: 6
Registered: ‎10-01-2019
Location: RO
Views: 178
Message 20 of 22

Re: Ideapad 530S-14ARR CPU underclocks at 0.38 ghz when battery is bellow 21%

I also have this exact same laptop with the latest bios update (55W or W55, whatever it's called).

Mine does not boot if the battery is under 21%, I need to charge it above 21% and unplug the charger for it to boot and turn on. (using windows 10). Do you guys have the same problem? It never boots though, the loading circle is not showing up and it eventually turns off due to complete drainage. It's getting on my nerves...

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