We are experiencing problems with CPU throttling on a number of D34010WYK units. For reasons that are currently unknown, the CPU (i3-4010U) on these units throttles back to approximately 230 MHz and remains at that frequency until a reboot. Often, the problem will recur after a reboot (both hard and soft). I've already checked that there are no problems with cooling on the units, and the CPU scaling governor (in Linux) is set to "performance" with a range of 800 MHz to 1.7 GHz. The hardware reports a scaling range of 800 MHz to 1.7 GHz, so a frequency of 230 MHz should not be settable from software. We've deployed several hundred of these units in the field, and are experiencing this issue on about 2% of the units. The affected units are not able to run our application, and it is critical that we have a resolution to this problem within the next two weeks.
The following is as much information about the affected units that I can provide from the escalation checklist:
NUC Model: D34010WYK
Date of Manufacture: 06/2014
AA# or SA#: unavailable at this time
Serial numbers: unavailable at this time
BIOS Version: WYLPT10H.86A.0026.2014.0514.1714
Operating system: Ubuntu 14.04, Linux 3.15.6-031506-generic #201407172034 SMP Fri Jul 18 00:36:12 UTC 2014 x86_64
Monitor or TV make/model: Samsung, model number not available
Graphics driver version: i915 package version 2.99.910, driver reports "i915 1.6.0 20080730" in kernel log
Graphics port used: HDMI
Graphics converter/adapter used? no
AV receiver used? no
LAN device used: wired
LAN driver version: e1000e 2.3.2-k
LAN connectivity description: N/A
Memory: Kingston KVR16LS11S6/2 1.35V 2x2GB DDR3-1600
SSD: Kingston SMS200S3/30G 30GB
USB Devices: FTDI USB-RS232 adapter
Attached is the output of various system diagnostics tools, including /proc/cpuinfo, cpufreq-info, and lm-sensors.
Let me know if you need any other information. I'll be able to get the serial number information from the affected units soon. Thank you in advance for your help and support.