Before, i'd a problem about changing governor for my Pi (cpu always stays at 600Mhz in every mode), after doing some tweaking, i'd already make it up to 900Mhz. However, now i'm using a power-meter to check the power consumption and even when i set cpu = 900Mhz, the consumption stays the same number as 600Mhz case.
When i lower cpu to 500Mhz or 400Mhz, it did change power consumption, but for cases >=600Mhz, nope!
I've checked current cpu freq by using both method:
$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
$ cpufreq-info -s -m (result: 600 MHz:6.12%, 900 MHz:93.88%)
they say i'm running my Pi at 900Mhz, yet no single number changes in my multi-meter screen?
(i've change several power adapter and no warning led & temp stays around 45)
Can anyone know about my problem? thank you so much for reading!
p/s: according to this site: Pi-Power under load should consume 2.1W, mine is only 1.75W (testing scenario is the same)