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On Arduino compatible boards the on-board general purpose led (GP) is connected to GPIO pin 13. On Galileo board the on-board pin is not currently working due to a known issue on the board itself. On Galileo GP led is not really connected to pin 13 but 20. A workaround needs to be put in place to write to GPIO pin 20 every time pin 13 is written. Extra muxing might be needed as well.

Got
cmd = 'echo %d > /sys/class/pwm/pwmchip0/pwm%d/period' % (period, channel) TypeError: %d format: a number is required, not NoneType
for gpio.setPWMPeriod(10, 20000000)

Thus I reversed argument order and got success.
Seems it has broken somewhere inside the lib, not in Edison wrapper.
However, I don't mind.

git version of wiring-x86: commit 74e15c7
Hardware: Intel Edison v2 with Arduino breakout

The SPI pins come up in an invalid state, and need some tweaking before the ADC can be read. The ADC example works because it uses Pin13 to output, but if you have a simpler sketch, then the muxing is incorrect for successful ADC reading.
Platform: Intel Edison.