Some c-states exposed by the intel_idle driver are assigned the same line_level, which means that the most recent one assigned can overwrite another c-state. For example, the C1-SKL c-state is overwriten by the C1E-SKL c-state because both are assigned line_level 1. To fix this, check if a "sub c-state" (ex. C1E-SKL) is being inserted. If so, check the vector of c-states if a c-state with similar name (ex. C1-SKL, compared to C1E-SKL), and modify the line level so there is no overwriting. Signed-off-by: Gautam Paranjape <gautam.paranjape(a)intel.com&gt; --- src/cpu/abstract_cpu.cpp | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/src/cpu/abstract_cpu.cpp b/src/cpu/abstract_cpu.cpp index bc323368b71f..c59721cb349a 100644 --- a/src/cpu/abstract_cpu.cpp +++ b/src/cpu/abstract_cpu.cpp @@ -218,6 +218,17 @@ void abstract_cpu::insert_cstate(const char *linux_name, const char *human_name, } if (*c >= '0' && *c <='9') { state->line_level = strtoull(c, NULL, 10); + if(*(c+1) != '-'){ + int greater_line_level = strtoull(c, NULL, 10); + for(unsigned int pos = 0; pos < cstates.size(); pos++){ + if(*c == cstates[pos]->human_name[1]){ + if(*(c+1) != cstates[pos]->human_name[2]){ + greater_line_level = max(greater_line_level, cstates[pos]->line_level); + state->line_level = greater_line_level + 1; + } + } + } + } break; } c++; -- 2.9.3