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Last reply by 09-23-2022 Unsolved
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2 Bronze
2 Bronze
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9520 SSD speed drops and hibernate stops working after switching to AHCI

Hi all. I just got the new XPS 15 9520 (Windows 11) and switched it from RAID to AHCI by following this guide as I'll need to dual-boot Windows and Linux. However, after successfully changing to AHCI, the SSD read speed dropped from nearly 7000 MB/s to 4500MB/s. What's more annoying is that hibernate doesn't work anymore. Upon waking from hibernation, Windows either crashes and gives the Recovery Options blue screen, or it boots up with all the apps closed (essentially a restart). Does anyone know how to solve this?

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767

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5 Rhenium
763

I was looking through your specifications and do not see if your system uses Optane memory.  If it does, RAID is required for that operation.

What driver does the Device Manager show for the NVMe drive?

If you are going to put Linux on that system, do research to see the best way to do that and backup everything you can prior to doing so.  If done incorrectly, future upgrades may be compromised.  I am not a Linux user so I cannot offer guidance.

If that system is a modern standby system, you might want to check the link which talks about that operation.  A way to tell if it is, the Properties tab on the Wi-Fi device in Device Manager will not normally have a Power Management tab.

Modern Standby | Microsoft Docs

_____________________________________
XPS 9365, Inspiron 7567 Gaming, Inspiron 7779, XPS One 2720, AW3423DW
System fully Win 11 compliant
757

Thanks for your reply. I'm not sure if there's optane on the system. In device manager the disk doesn't have optane in the name so I'm guessing there isn't.

The driver for NVMe is Standard NVM Express Controller if the system is switched to AHCI. It indeed has modern standby.

756

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5 Tungsten
738

About the speeds, there is a reason that Dell sets SATA mode to RAID for their machines. They perform better with Intel Rapid storage drivers. Even 4500 MBPS is not bad and capable of holding any thing you can throw at it. 

I also had issues with Hibernation while in dual boot and it has nothing to do with sata mode. For every model the fix is different, you may have to do some research on Linux forums, in my case solution was to install Ubuntu on secondary HDD. Windows saves a temp image of opened apps and services on the hard drive and restores it when it wakes from Hibernation. If you can not resolve it, use sleep instead. 

 

https://superuser.com/questions/419186/how-should-i-set-up-my-dual-boot-so-that-i-can-hibernate-the-...

 

 


723

In Win 11, those standard drivers may be fine since my 980 Pro is using standard drivers on a PCIe 4 system and getting full speed.

I have changed controllers on my systems multiple times and never noticed a hibernation situation.  Maybe shutting the system all the way down would rewrite your hibernation file and update it.

_____________________________________
XPS 9365, Inspiron 7567 Gaming, Inspiron 7779, XPS One 2720, AW3423DW
System fully Win 11 compliant
7 Plutonium
721

The system is likely configured with Intel Virtual Management Devices which requires the RAID SATA Operation. At present there is no Linux Kernel VMD Driver so you need to use AHCI in order to recognise your internal drive in Linux... Sadly the newer Kernel in Ubuntu 22.04 or Fedora 36 does not have an Intel VMD Driver. It'll be another 2 years until a new mainstream build of Ubuntu is out.

The Intel VMD optimizes the performance of the storage controller by communicating with the NVMe SSD, Intel Processor and RAM and is therefore expected to have a higher read/write speed than using the legacy AHCI SATA Operation. In other words is working as expected.

Windows 11 itself is designed to work only on modern hardware with newer technologies... By disabling these technologies i.e. by using a legacy AHCI SATA Operation you are more likely to run into issues such as what you are experiencing such as coming out of hibernation etc.

Philip_Yip_0-1655129698302.png

You'll need to gauge how often you are using Windows and how often you are using Linux. If you use Windows vastly more than Linux, use of the RAID SATA Operation with VMD Drivers and a Virtual Machine (VMware, VirtualBox or Hyper-V) will likely perform better. 

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads


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@inteks wrote:

intel vmd is only supported on xeon CPUs https://www.intel.de/content/www/de/de/architecture-and-technology/intel-volume-management-device-ov...


That link appears to be an older product sheet, with the high end Xeon processors originally showcasing the technology. Intel VMD is now used in more mainstream systems with 11th Generation and 12th Generation Processors:

Intel® VMD is the new way to configure platforms for Intel® RST management of RAID and Intel® Optane™ memory volumes.

The proper HW and BIOS support is currently available in mobile 11th and 12th Generation Intel® Core™ Processor-based systems.

How to Configure RAID or Intel® Optane™ Memory with... 

Intel 11th Generation Processors, No Drives Can Be Found During Windows 10 and Windows 11 Installati...

Dr Philip Yip
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide

Windows FAQs and OEM Downloads


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