This also happens on BYT-M N2830 CPU... and likely all other BYT-M SKUs. ---- U. Artie From: PowerTop [mailto:powertop-bounces@lists.01.org] On Behalf Of Eoff, Ullysses A Sent: Wednesday, February 18, 2015 12:27 PM To: powertop(a)lists.01.org Subject: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error Powertop fails with error: "read_msr cpu0 0x3fe : Input/output error" on BYT-M N3540 CPU (model 0x37). From the sourcecode, it appears c7 support depends on the presence of "/sys/bus/pci/devices/0000:00:13.0" for model 0x37. Directory "/sys/bus/pci/devices/0000:00:13.0" does not exist on my system. The commit that introduced this problem is: commit e01a025bc37f730379edc001e7f12fa269b68fbd Author: alexandra.yates@linux.intel.com<mailto:alexandra.yates@linux.intel.com> <alexandra.yates@linux.intel.com<mailto:alexandra.yates@linux.intel.com>> Date: Fri Aug 22 02:52:19 2014 -0700 bug fix intel bdw: package c-state support ---- U. Artie _______________________________________________ PowerTop mailing list PowerTop(a)lists.01.org https://lists.01.org/mailman/listinfo/powertop