kernel drm stuck on bsd ring

Hi all,

I have been working on integrating the Media SDK / GPU into our real-time streaming media server.  Most of the functionality is now working at low density (2 to 4 parallel processing channels) and we are attempting to ramp things up.  Unfortunately, we start seeing some serious issues as we hit 6 and 8 channels.  The device continuously reports 'busy' and the error 'kernel drm stuck on bsd ring' was observed in /var/log/messages.

Searching for this in the forums yields nothing.  Searching globally I found some similar issues pointing to the kernel version.  Any insight from the minds at Intel?

Thanks - Bob / Dialogic

The system I am using . . 

MediaServerStudioProfessionalEvaluation2015R6

bogomips        : 7200.18
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 60
model name      : Intel(R) Xeon(R) CPU E3-1285 v3 @ 3.60GHz
stepping        : 3
microcode       : 0x1c
cpu MHz         : 3437.296
cache size      : 8192 KB
physical id     : 0
siblings        : 8
core id         : 1
cpu cores       : 4
apicid          : 2
initial apicid  : 2
fpu             : yes
fpu_exception   : yes