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Crowley155
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Posts: 13
Registered: ‎12-03-2017
Location: US
Views: 1,039
Message 1 of 7

X1 Carbon Audio Stuttering / High DPC Latency

Good morning,

 

We recently purchased 25 Lenovo X1 Carbon Gen 5's.  All of them have been experiencing significant issues that we've been unable to resolve.  

 

We've tried updating to Winver 1709, downloading all the most recent patches from Lenovo, changing every conceivable setting on the BIOS, disabling every system device, etc.  Nothing helps.

 

Attached is a screenshot of DPC latency on a fully patched machine.

 

Has anyone else with an X1 experienced this and do you have any ideas?

Crowley155
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Posts: 13
Registered: ‎12-03-2017
Location: US
Views: 983
Message 2 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

If nothing else, is there anyone out there with an X1 carbon Gen 5 that can confirm they aren't having this problem?  Or can someone @ Lenovo pull one of the Gen 5 w/ same specs off the shelf to see if they can replicate?

 

Full specs:

 

------------------
System Information
------------------
Time of this report: 12/4/2017, 07:35:35
Machine name: LAPTOP-QOSSN6S9
Machine Id: {32A49C26-211D-499D-B617-479EC9A2C3A9}
Operating System: Windows 10 Pro 64-bit (10.0, Build 16299) (16299.rs3_release.170928-1534)
Language: English (Regional Setting: English)
System Manufacturer: LENOVO
System Model: 20HR000WUS
BIOS: N1MET41W (1.26 )
Processor: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz (4 CPUs), ~2.7GHz
Memory: 8192MB RAM
Available OS Memory: 8092MB RAM
Page File: 2763MB used, 7248MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 12
DX Setup Parameters: Not found
User DPI Setting: 144 DPI (150 percent)
System DPI Setting: 144 DPI (150 percent)
DWM DPI Scaling: UnKnown
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Not Supported
DxDiag Version: 10.00.16299.0015 64bit Unicode

Crowley155
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Posts: 13
Registered: ‎12-03-2017
Location: US
Views: 928
Message 3 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

Does anyone @Lenovo even look at this stuff or is this just a black hole they send people to? 

 

I spent over $35k on laptops with this company, paid $200 for premium support, and still can't get someone on the phone that'll do more than tell me to re-install drivers for the umpteenth time.

 

If you've got these kind of errors in the services text I can only imagine how sloppy the driver is written.  FYI, when I delete the conexant driver this latency drops significantly.  Still have issues, but I suspect this isn't localized to your audio driver.

 

Capture.PNGServices

 

 

Crowley155
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Posts: 13
Registered: ‎12-03-2017
Location: US
Views: 896
Message 4 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

Linking to other relevant post: https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/Thinkpad-X1-Carbon-5th-Conexant-Audio-Driver-...

 

We ultimately re-installed the Conexant driver but disabled the Conexant Services:

Conexant Audio Message Service

Conexant SmartAudio service

CxUtilSvc 

 

This dropped our latency & CPU spikes significantly but we're still experiencing major static.  We do not see this same behavior on same spec HP 840's & Dell 5470 Machines (i5 processor, 8gb memory, 256 SSD), same application, same network, same base image, same windows version.

 

We really wanted to move to "the maserati of business laptops" but now I'm stuck with a bunch of these that I can't deploy to users.

tbThink17
Blue Screen Again
Posts: 16
Registered: ‎10-29-2017
Location: US
Views: 822
Message 5 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

My Config:  X1C5 I7-7500U 16GB 1TB WQHD WIN PRO 10 (not yet running fall creators update).

 

No RED spikes running dpclat program, but close.   I've been playing back USB audio and its pretty solid.

 

What app are you experiencing drop outs?

Crowley155
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Posts: 13
Registered: ‎12-03-2017
Location: US
Views: 817
Message 6 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

It's everything. Do you have the Conexant audio driver ?

tbThink17
Blue Screen Again
Posts: 16
Registered: ‎10-29-2017
Location: US
Views: 797
Message 7 of 7

Re: X1 Carbon Audio Stuttering / High DPC Latency

Yes, Smart audio HD version 8.66.76.56 dated 9/29/2017.

What app is dropping audio?

Check out this app to get a better idea of what device is causing latency:

http://www.resplendence.com/latencymon    v 6.51

 

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