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[GH-ISSUE #457] Config for Lenovo 720s 13-IKBR 8250u #413

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opened 2026-02-26 00:32:34 +03:00 by kerem · 7 comments

kerem commented

2026-02-26 00:32:34 +03:00

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Originally created by @vitas13 on GitHub (Mar 9, 2018).
Original GitHub issue: https://github.com/hirschmann/nbfc/issues/457

Hello,
I'm trying to create my own config file for this laptop and i'm stuck on probing registers.
Here is mine 2 min dump form prime95:
0x00: 00, 0A,0A
0x06: 2E,30,2E,30, 2D,2A, 29,27, 26,27,25,28,2A,29,27,28,27, 25,24,00,00
0x07: 00, 21
0x0D: 2D, 2C, 2B, 2A, 29,2A, 29, 28,00,28
0x0E: 32, 33,32, 31, 30, 2F, 30,31, 30, 2F,2E,28,28
0x0F: 00, 2D,2D
0x12: 80, 00,00
0x13: 00, 80
0x14: 05, 00,00

This model has two fans. I think 0x06 and 0x07 is first fan and 0x0D and 0x0E is second fan, but writing to this registers don't do anything.
Maybe manual changing for EC is disabled. Someone was trying luck with this model?

Originally created by @vitas13 on GitHub (Mar 9, 2018). Original GitHub issue: https://github.com/hirschmann/nbfc/issues/457 Hello, I'm trying to create my own config file for this laptop and i'm stuck on probing registers. Here is mine 2 min dump form prime95: 0x00: 00, 0A,0A 0x06: 2E,30,2E,30, 2D,2A, 29,27, 26,27,25,28,2A,29,27,28,27, 25,24,00,00 0x07: 00, 21 0x0D: 2D, 2C, 2B, 2A, 29,2A, 29, 28,00,28 0x0E: 32, 33,32, 31, 30, 2F, 30,31, 30, 2F,2E,28,28 0x0F: 00, 2D,2D 0x12: 80, 00,00 0x13: 00, 80 0x14: 05, 00,00 This model has two fans. I think 0x06 and 0x07 is first fan and 0x0D and 0x0E is second fan, but writing to this registers don't do anything. Maybe manual changing for EC is disabled. Someone was trying luck with this model?

kerem

2026-02-26 00:32:34 +03:00

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kerem commented

2026-02-26 00:32:35 +03:00

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@shobullus commented on GitHub (Mar 15, 2018):

Any progres? Got the same notebook and the same fan problem. No preset seems to work.

@shobullus commented on GitHub (Mar 15, 2018): Any progres? Got the same notebook and the same fan problem. No preset seems to work.

kerem commented

2026-02-26 00:32:35 +03:00

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@firegate22 commented on GitHub (Mar 17, 2018):

Same problem here. I think the read register is 6 at least the current fan speed seems to be correct. Write register no success.

Little offtopic: do you have the newest bios (6MCN14WW)? My CPU is limited to 1,5 GHZ before the bios upgrade everything was normal.

@firegate22 commented on GitHub (Mar 17, 2018): Same problem here. I think the read register is 6 at least the current fan speed seems to be correct. Write register no success. Little offtopic: do you have the newest bios (6MCN14WW)? My CPU is limited to 1,5 GHZ before the bios upgrade everything was normal.

kerem commented

2026-02-26 00:32:35 +03:00

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@vitas13 commented on GitHub (Mar 18, 2018):

For me, no progress so far. I think writing to EC registers is disabled.
Don't upgrade to the newest bios, it brakes turbo mode and as you say, you are stuck at 1.5 Ghz.
You can always downgrade to old one, just turn on flash back function in bios.

@vitas13 commented on GitHub (Mar 18, 2018): For me, no progress so far. I think writing to EC registers is disabled. Don't upgrade to the newest bios, it brakes turbo mode and as you say, you are stuck at 1.5 Ghz. You can always downgrade to old one, just turn on flash back function in bios.

kerem commented

2026-02-26 00:32:35 +03:00

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@taralloc commented on GitHub (Apr 8, 2018):

About the turbo issue: I'm on BIOS 6MCN18WW and the problem is present. However, it's not a problem of turbo but of speed shift, which is disabled. The problem is solved if you enable speedshift in Throttlestop.

@taralloc commented on GitHub (Apr 8, 2018): About the turbo issue: I'm on BIOS 6MCN18WW and the problem is present. However, it's not a problem of turbo but of speed shift, which is disabled. The problem is solved if you enable speedshift in Throttlestop.

kerem commented

2026-02-26 00:32:35 +03:00

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@Lixy13 commented on GitHub (Sep 10, 2018):

hi there! any progress since April? I'm struggling to make a working config..

@Lixy13 commented on GitHub (Sep 10, 2018): hi there! any progress since April? I'm struggling to make a working config..

kerem commented

2026-02-26 00:32:35 +03:00

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@github-actions[bot] commented on GitHub (Dec 1, 2019):

This issue is stale because it has been open more than 180 days with no activity. If nobody comments within 7 days, this issue will be closed

@github-actions[bot] commented on GitHub (Dec 1, 2019): This issue is stale because it has been open more than 180 days with no activity. If nobody comments within 7 days, this issue will be closed

kerem commented

2026-02-26 00:32:35 +03:00

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@taralloc commented on GitHub (Dec 1, 2019):

Is it working?

@taralloc commented on GitHub (Dec 1, 2019): Is it working?