Device Encryption Support Reasons for failed automatic device encryption: Un-allowed DMA capable

Looking through MSINFO32 I see the line:
Device Encryption Support Reasons for failed automatic device encryption: Un-allowed DMA capable bus/device(s) detected

What does it mean? My laptop C:\ drive is encrypted the whole thing. Does this mean I have a problem?

I have these lines too:
Secure Boot State On
PCR7 Configuration Bound

System Information report written at: 09/22/17 20:02:42
System Name: DESKTOP-4PCRIDJ
[System Summary]

Item Value 
OS Name Microsoft Windows 10 Pro 
Version 10.0.15063 Build 15063 
Other OS Description  Not Available 
OS Manufacturer Microsoft Corporation 
System Name DESKTOP-4PCRIDJ 
System Manufacturer Dell Inc. 
System Model XPS 15 9560 
System Type x64-based PC 
System SKU 07BE 
Processor Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 2801 Mhz, 4 Core(s), 8 Logical Processor(s) 
BIOS Version/Date Dell Inc. 1.5.0, 8/30/2017 
SMBIOS Version 3.0 
Embedded Controller Version 255.255 
BIOS Mode UEFI 
BaseBoard Manufacturer Dell Inc. 
BaseBoard Model Not Available 
BaseBoard Name Base Board 
Platform Role Mobile 
Secure Boot State On 
PCR7 Configuration Bound 
Windows Directory C:\WINDOWS 
System Directory C:\WINDOWS\system32 
Boot Device \Device\HarddiskVolume1 
Locale United States 
Hardware Abstraction Layer Version = "10.0.15063.502" 
User Name DESKTOP-4PCRIDJ\purpl 
Time Zone Mountain Daylight Time 
Installed Physical Memory (RAM) 32.0 GB 
Total Physical Memory 31.9 GB 
Available Physical Memory 24.2 GB 
Total Virtual Memory 36.6 GB 
Available Virtual Memory 28.1 GB 
Page File Space 4.75 GB 
Page File C:\pagefile.sys 
Device Encryption Support Reasons for failed automatic device encryption: Un-allowed DMA capable bus/device(s) detected 
A hypervisor has been detected. Features required for Hyper-V will not be displayed.