i5-6300HQ max CPU frequency set to 760 МГц in Ubuntu 15.04

I have в Делла Инспирон i7559 laptop with в Core i5-6300 HQ and an NVIDIA GTX960M GPU. I have installed Ubuntu 15.04 on it, and гve been noticing that the CPU выступление is much slower than I expected, especially when I run make even when using all four threads. Lintian takes extremely long amounts of украл when checking packages и т.д.

So I downloaded Супер Пи and ran в single threaded benchmark. For 1M digits of pi, it takes 25-26 seconds, whereas my Windows install on the same computer takes 12-13 seconds. Under похвалите, indicator-cpufreq only шоу 0.76 GHz.

Something is also off with cpufreq-info, it доклады steps of 1 МГц and 759 МГц? That doesn't make sense to я; herВs the доклад for CPU0:

analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 10.0 us.
  hardware limits: 1000 kHz - 759 MHz
  available frequency steps: 759 MHz, 1000 kHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 1000 kHz and 759 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 1000 kHz.
  cpufreq stats: 759 MHz:19.19%, 1000 kHz:80.81%  (673)

This is really в problem for я, and I don't know why this is happening. Any suggestions or пойнтеры would be very helpful, thank you!

EDIT: I ran these

 $ lshw -c cpu
 *-cpu                   
   product: Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz
   vendor: Intel Corp.
   physical id: 1
   bus info: cpu@0
   size: 1MHz
   capacity: 759MHz
   width: 64 bits

and

 $ cat /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
 759000

I do not know the implications of "bios_limit", because it works Windows умер in, but is there в way to change this safely so that I хан использовал both the стандарт 2.3 GHz and the Intel Турбокомпрессор speeds? Турбокомпрессор goes up to 3.2 GHz on this one.