1. #1

    [W10ProV1709b16299 x64] High DPC Lat. Lenovo X1 Carbon.


    I work in the IT dept at my company and we recently purchased 25 Lenovo X1 Carbons as our standard laptop (replacing the Dell 5470 series). Unfortunately we've been having issues that are causing audio static & dropouts, mouse 'jerkiness', WiFi dropping, and other weird problems. We've been trying to fix this for several weeks and haven't been able to come up with anything or get any help from Lenovo.

    We've used a tool called LatencyMon and are seeing a lot of issues with wdf01000.sys. We've tried just about everything that we can think of. So far:

    • Re-imaged several test machines using Lenovo repair tool
    • We see this on machines right out of the box, and fully updated with most recent drivers & upgraded to Windows 1709 Fall Creators Update
    • Updated BIOS
    • Tried changing every BIOS setting we thought was relevant to performance/tweaking
    • Tried updating drivers directly from vendors
    • Xperf's don't show anything different or specific but we can re-run new ones
    • We have a few HP Elitebook 840's and ~150 Dell 5470's with same specs (core i5, 256 ssd, 8gb memory) and we're not seeing these same performance issues

    [W10ProV1709b16299 x64] High DPC Lat. Lenovo X1 Carbon.-pastedimage-1-jpg
    [W10ProV1709b16299 x64] High DPC Lat. Lenovo X1 Carbon.-pastedimage-jpg

    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

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  2. #2
    xilolee's Avatar
    Join Date
    Dec 2013
    World, Europe, Italy
    • specs System Specs
      • Manufacturer:
      • Model Number:
      • Motherboard:
        ASROCK FM2A88M Pro3+ chipset A88X Bolton-D4
      • CPU:
        A10-7800, 4 CPU, 4 thr, 65/45W, FM2+, 28nm, Steamroller/Kaveri
      • Memory:
        10GB (Nanya and kingston ddr3-1333 9-9-9-24)
      • Graphics:
        Radeon R7 720MHz (8 GPU cores, integrated in CPU)
      • Sound Card:
        RealTek ALC662 (integrated in MB)
      • Hard Drives:
        Seagate ST500DM002-1BD142 500GB 7200RPM
      • Power Supply:
        SuperFlower 450W 80+ Platinum (SF-450P14PE)
      • Case:
        Sharkoon VG4-S
      • Cooling:
        Realtek RTL8111GR (NIC integrated in MB)
      • Display:
        Samsung SyncMaster SA100 LS22A100NS-EN
      • Operating System:
        Windows 10 Home/Standard x64

    Re: High DPC Latency | Lenovo X1 Carbon (20HR000WUS)

    Hi Crowley155.

    (Moose here )

    Not sure if I/we can help, but without any logs is almost impossible (for poor mortals like me, at least).

    Could you read this thread (click) and provide the logs?
    writhziden says thanks for this.

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