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36 Posts

07-03-2021

Denmark

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L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-15, 7:20 AM

I discovered that my Samsung 1 TB 970 EVO plus, downgrade to half speed when operating on battery

(eg it steps down to PCIe 2 speed 5 GT/s according to lspci tool)

I didn't check that with the original 256GB NVMe ?

 

Anybody seen similar ?

 

I have checked it with Linux

 

Knud

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2834 Posts

03-11-2020

Greece

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Re:L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-15, 8:53 AM

Hi Knudch,

 

Welcome to the Community Forums.

 

Make sure you are running at Max Performance when on battery, and check that the device is not allowed to turn off the disk to save power:

 

Step 1. Check Disk Power Management Settings:
- Press Windows Key + X, select Device Manager
- Expand 'Disk Drives' and right click the device in question and select 'properties.
- Check Power Management, and make sure the computer is not allowed to turn these devices off to save power.
- Hit "Apply" and exit and then "OK".

 

Step 2. Checking The Advanced Power Options. 
- In the Search function type : 'Edit Power Plan'
- Select "Change advanced power settings"
- Find and expand "PCI Express"
- Make sure the "Link State Power Management" setting is set to "Off"

- Restart the device.

 

 

Hope this helps

 

Regards

 

Voithos

 

 



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36 Posts

07-03-2021

Denmark

56 Signins

440 Page Views

  • Posts: 36
  • Registered: ‎07-03-2021
  • Location: Denmark
  • Views: 440
  • Message 3 of 6

Re:L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-15, 11:34 AM

Hi Voithos

 

Thanks for information.

 

As I am running Linux it is not just like you describe but you lead me to the right point

 

PCIe linkstate issue...

 

Now I am looking around how to control this

 

I wonder if it will be effected by the feature described in L14/15 linux user guide chapter 3 "Use Intelligent Cooling feature" ?

 

Unfortunately Pressing Fn + L or M or H doesn't seem to have any effect at all  ..... absolute nothing....does this work at all ?

 

Knud

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2834 Posts

03-11-2020

Greece

328 Signins

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  • Posts: 2834
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Re:L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-15, 12:11 PM

Oh, I thought you had tested it as well on Linux, but also had Windows. I am not well versed in the Linux OS unfortunately, so I can't help you. I'd suggest posting the question in the Linux forum section, maybe someone can help you find similar settings.

 

Regards

 

Morten



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1198 Posts

05-14-2020

United States of America

501 Signins

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Re:L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-15, 12:27 PM

Hello,

 

I use Linux on my L15, repost the question on Linux section of these forums, if you use fedora, ubuntu, debian, post in the appropriate section, otherwise select 'other linux'

 

Sometimes issues depend on the flavor of linux used.

 

 

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248 Posts

07-30-2019

China

263 Signins

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  • Message 6 of 6

Re:L15 AMD 2nd gen, NVMe SSD running half speed when on battery

2021-07-23, 3:14 AM

Hi 

It looks like AMD Renoir and Cezanne platform products have the same bahavior,  NVMe SSD runing at PCIE Gen2X4 speed at battery only mode, this is AMD PCIE Speed power policy rules. 

Thanks.

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