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hexaae
04-15-2016, 03:01 AM
Just noticed that after resume from Sleep internal default M.2 speed drops down drastically from 2100+ to 825MB/s till your next reboot!

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Driver: Intel Chipset SATA RAID Controller 14.6.3.1032 by Intel Corporation.
Drive Model: NVMe SAMSUNG MZVPV256, Drive Revision: BXW7
BIOS 208

SOLVED ---> https://rog.asus.com/forum/showthread.php?84587-G752VY-issue-with-M-2-speed-after-resume-from-sleep&p=588732&viewfull=1#post588732

theGOAT
04-15-2016, 04:17 AM
having the same issue, same SSD

ROG_HARDCORE
04-15-2016, 06:25 AM
This is on Which Bios? Raid mode right? not AHCI?
I'm on AHCI, and seems to be ok.

theGOAT
04-15-2016, 07:10 AM
yes, mine is on raid mode. when i try to switch to achi, i get a blue scree.

Gustave
04-15-2016, 08:48 AM
Me too I had this issue. JustinThyme (https://rog.asus.com/forum/search.php?searchid=7179884) adviced me to look at what software was hammering the drive. With me it was Norton 360 from Symantec. When I altered some settings the issue was practically over. I also noticed that, when having these 'slow' speeds a reboot brought the drive speed back on par.

When you alter the BIOS SATA settings from RAID to AHCI on an installed Windows configuration you need to alter some registry settings I seem to recall from earlier days.

It is explained somewhere else in this forum.

hexaae
04-15-2016, 10:21 AM
I don't use AVs but Defender + UAC at max and surf on the web always sandboxed (i.e. Edge, IE11 with Enhanced Protected Mode, Google Chrome) and never touched those RAID/AHCI settings... will have a look in the BIOS.
I'm afraid it's (another) Intel driver bug anyway, or something in the BIOS 208...

EDIT:
this should be the solution for RAID -> AHCI bluescreens:
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/changing-from-raid-to-ahci/4c94f678-6bd1-48a6-b871-8872c841023a?auth=1

EDIT2:
I just realized I never installed IRST_Intel_Skylake_Win10_64_VER14631032 (Intel Rapid Storage Technology driver) available from the ASUS official download page, maybe this is enough to fix the drive status after resume from sleep...

hexaae
04-15-2016, 05:39 PM
I see no RAID -> AHCI option in my BIOS 208:

56896568955689456897

Please, can you mention the driver version you're currently using?

hexaae
04-15-2016, 06:21 PM
WARNING!
FYI do not install latest official Intel RST 14.8.0.1042: black screen on resume from sleep on my G752VY :(
(Reason for strike through: Intel RST 14.8.0.1042 won't black screen anymore with BIOS 211)

Problem not solved installing IRST_Intel_Skylake_Win10_64_VER14631032 from ASUS download: transfer rate still halved after resume from sleep.

hexaae
04-16-2016, 07:32 AM
This is interesting...
the slow transfer rate bug after resume is present only after Sleep:
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if right after I put the laptop in Hybernation and resume the Samsung NVMe MZVPV256 returns to the correct speed:
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Definitely a bug in the BIOS (sleep power save status) or Intel drivers.

G752VY-T7004T
Driver: Intel Chipset SATA RAID Controller (= Intel RST drivers) 14.6.3.1032 by Intel Corporation.
Drive Model: NVMe SAMSUNG MZVPV256, Drive Revision: BXW7
BIOS 208

Gustave
04-16-2016, 08:13 AM
I see no RAID -> AHCI option in my BIOS 208:

.........

Please, can you mention the driver version you're currently using?



I am running BIOS 211 (http://dlcdnet.asus.com/pub/ASUS/nb/G752VY/G752VYAS_211.zip?_ga=1.161484860.1270684227.145743 9627)

hexaae
04-16-2016, 08:48 AM
I am running BIOS 211 (http://dlcdnet.asus.com/pub/ASUS/nb/G752VY/G752VYAS_211.zip?_ga=1.161484860.1270684227.145743 9627)
Wasn't available 'till this morning in the public download area: https://www.asus.com/ROG-Republic-Of-Gamers/ROG-G752VY/HelpDesk_Download/

Just installed, and still the same bug: halved transfer rate on resume after sleep only (Hybernation or reboot will restore correct speed)
56910

G752VY-T7004T
Driver: Intel Chipset SATA RAID Controller (= Intel RST drivers) 14.6.3.1032 by Intel Corporation.
Drive Model: NVMe SAMSUNG MZVPV256, Drive Revision: BXW7
BIOS 211

EDIT:
just checked and now I have the RAID/AHCI option in the new BIOS, will try switching to AHCI modifying first those Windows registry keys (and creating a Restore Point)...

hexaae
04-16-2016, 09:02 AM
This is on Which Bios? Raid mode right? not AHCI?
I'm on AHCI, and seems to be ok.
Resume from Sleep mode?
Please can you post your infos?

Driver: Intel Chipset SATA RAID Controller ??? by Intel Corporation.
Drive Model: NVMe ???, Drive Revision: ???
BIOS ???
Secure boot: ON?

Gustave
04-16-2016, 09:16 AM
I downloaded the G752VYAS_211 BIOS (http://dlcdnet.asus.com/pub/ASUS/nb/G752VY/G752VYAS_211.zip?_ga=1.98810910.1270684227.1457439 627) file the 8th of March. I thought it to be peculiar that the file was available on some Asus download sites and not on others.

hexaae
04-16-2016, 12:15 PM
yes, mine is on raid mode. when i try to switch to achi, i get a blue scree.
Same problem here: can't switch to AHCI, even after being sure my registry was OK with

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\msahci "Start" value set to 0
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\iastorV "Start" value set to 0
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\atapi "Start" value set to 0

and changing BIOS 211 from RAID to AHCI I have blue screen INACCESSIBLE_BOOT_DEVICE.
BTW, it was already set to 0 for all keys in the registry.
(Ignore the driver name "Windows 7", I have of course Windows 10 x64 installed)

5691156912

I wonder if I should try AHCI from BIOS + msahi "Start" = 1.... mh...

purekaoz777
04-16-2016, 01:03 PM
I also too noticed my Samsung NVMe SM951s speed is reeduced after I sleep the computer. I am running BIOS 211 with latest Intel chipset driver 14.8.0.1042. Hopefully this issue will be addressed soon.

hexaae
04-16-2016, 01:48 PM
I also too noticed my Samsung NVMe SM951s speed is reeduced after I sleep the computer. I am running BIOS 211 with latest Intel chipset driver 14.8.0.1042. Hopefully this issue will be addressed soon.
Probably we have to wait for a BIOS (currently 211) or Intel RST driver update.

TEMP. WORKAROUND to restore full speed:
when it gets slow after sleep, put laptop in Hibernation and resume to keep your work... or reboot.

hexaae
04-25-2016, 11:16 PM
SOLVED!

I can confirm that switching to AHCI will cure this issue with halved M.2 transfer rate after resume from sleep!
Config:
BIOS 212 (https://www.asus.com/ROG-Republic-Of-Gamers/ROG-G752VY/HelpDesk_Download/), driver: Intel(R) 100 Series/C230 Chipset Family SATA AHCI Controller 14.8.0.1042 (https://downloadcenter.intel.com/it/download/25165/Driver-Intel-Rapid-Storage-Technology-Intel-RST-RAID)
Boot drive: NVMe SAMSUNG MZV PV256 (was originally set to RAID), second drive: Samsung SSD 850 EVO 1TB
AHCI mode BEFORE sleep and AFTER sleep resume:

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(ATTO download (http://www.softpedia.com/dyn-postdownload.php/ee52a3bdb5677d701175f4050e8b00fa/571ea95d/2378d/4/1?tsf=0) from Softpedia)

How to switch from RAID to AHCI the simplest way? Here is it, tested and worked fine for me:
http://www.tenforums.com/drivers-hardware/15006-attn-ssd-owners-enabling-ahci-mode-after-windows-10-installation-post332243.html#post332243

No need to edit registry.

1. Run Command Prompt as Admin
2. Invoke a Safe Mode boot with the command: bcdedit /set {current} safeboot minimal
3. Restart the PC and enter your BIOS during bootup with F2 (...note by Hexaae).
4. Change from RAID (...note by Hexaae) to AHCI mode then Save & Exit.
5. Windows 10 will launch in Safe Mode.
6. Right click the Windows icon (or use WIN+X ...note by Hexaae) and select to run the Command Prompt in Admin mode from among the various options.
7. Cancel Safe Mode booting with the command: bcdedit /deletevalue {current} safeboot
8. Restart your PC once more and this time it will boot up normally but with AHCI mode activated.