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...
        if (load) {
                *load = 0;
                for (cpu = 0; cpu < ncpus; cpu++) {
                        total = 0;
                        for (i = 0; i < CPUSTATES; i++) {
                            total += cp_times[cpu * CPUSTATES + i] -
                                cp_times_old[cpu * CPUSTATES + i];
                        }
                        if (total == 0)
                                continue;
                        *load += 100 - (cp_times[cpu * CPUSTATES + CP_IDLE] -
                            cp_times_old[cpu * CPUSTATES + CP_IDLE]) * 100 / total;
                }
        }
...

powerd -v -n adp -i 100%
powerd: unable to determine AC line status
load 314%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 267%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 180%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 133%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 136%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 153%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 152%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 147%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 142%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 164%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 160%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 133%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 146%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 217%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 177%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 172%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 193%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 178%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 177%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 128%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 154%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 152%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 168%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 133%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 140%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
load 155%, current freq 2333 MHz ( 0), wanted freq 2333 MHz
^Ctotal joules used: 146.016

--- powerd.c.orig       2015-03-19 17:41:06.154614000 +0200
+++ powerd.c    2015-03-19 17:43:07.718258000 +0200
@@ -168,6 +168,7 @@
                        *load += 100 - (cp_times[cpu * CPUSTATES + CP_IDLE] -
                            cp_times_old[cpu * CPUSTATES + CP_IDLE]) * 100 / total;
                }
+               *load = *load / ncpus;
        }

        memcpy(cp_times_old, cp_times, cp_times_len);

/* Always switch to the lowest frequency in min mode. */
      if (mode == MODE_MIN) {
         freq = freqs[numfreqs - 1];
         if (curfreq != freq) {
            if (vflag) {
               printf("now operating on %s power; "
                   "changing frequency to %d MHz\n",
                   modes[acline_status], freq);
            }
            idle = 0;
            if (set_freq(freq) != 0) {
               warn("error setting CPU freq %d",
                   freq);
               continue;
            }
         }
         continue;
      }

      /* Always switch to the highest frequency in max mode. */
      if (mode == MODE_MAX) {
         freq = freqs[0];
         if (curfreq != freq) {
            if (vflag) {
               printf("now operating on %s power; "
                   "changing frequency to %d MHz\n",
                   modes[acline_status], freq);
            }
            idle = 0;
            if (set_freq(freq) != 0) {
               warn("error setting CPU freq %d",
                   freq);
               continue;
            }
         }
         continue;
      }

      /* Adaptive mode; get the current CPU usage times. */
      if (read_usage_times(&load)) {
         if (vflag)
            warn("read_usage_times() failed");
         continue;
      }

      if (mode == MODE_ADAPTIVE) {
         if (load > cpu_running_mark) {
            if (load > 95 || load > cpu_running_mark * 2)
               freq *= 2;
            else
               freq = freq * load / cpu_running_mark;
            if (freq > freqs[0])
               freq = freqs[0];
         } else if (load < cpu_idle_mark &&
             curfreq * load < freqs[get_freq_id(
             freq * 7 / 8, freqs, numfreqs)] *
             cpu_running_mark) {
            freq = freq * 7 / 8;
            if (freq < freqs[numfreqs - 1])
               freq = freqs[numfreqs - 1];
         }
      } else { /* MODE_HIADAPTIVE */
         if (load > cpu_running_mark / 2) {
            if (load > 95 || load > cpu_running_mark)
               freq *= 4;
            else
               freq = freq * load * 2 / cpu_running_mark;
            if (freq > freqs[0] * 2)
               freq = freqs[0] * 2;
         } else if (load < cpu_idle_mark / 2 &&
             curfreq * load < freqs[get_freq_id(
             freq * 31 / 32, freqs, numfreqs)] *
             cpu_running_mark / 2) {
            freq = freq * 31 / 32;
            if (freq < freqs[numfreqs - 1])
               freq = freqs[numfreqs - 1];
         }
      }