Error initializing PWMOut object (sysfs_pwmout)
Board: Google Coral
Blinka 1.3.3
Platform Detect 1.0.3

```
Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import board
>>> import pulseio
>>> led = pulseio.PWMOut(board.PWM3, frequency=5000, duty_cycle=0)
OSError: [Errno 22] Invalid argument

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py", line 55, in __init__
    self._open(pin, duty_cycle, frequency, variable_frequency)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py", line 93, in _open
    self._set_enabled(False)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py", line 256, in _set_enabled
    self._write_pin_attr(self._pin_enable_path, "1" if value else "0")
  File "/usr/local/lib/python3.5/dist-packages/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py", line 130, in _write_pin_attr
    f_attr.write(value + "\\n")
OSError: [Errno 22] Invalid argument
```
diff --git a/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py b/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
index 6266fbb..89e0cbb 100644
--- a/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
+++ b/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
@@ -90,12 +90,12 @@ class PWMOut(object):
         except IOError as e:
             raise PWMError(e.errno, "Exporting PWM pin: " + e.strerror)
 
-        self._set_enabled(False)
-        
+        #self._set_enabled(False) # This line causes a write error when trying to enable
+                
         # Look up the period, for fast duty cycle updates
         self._period = self._get_period()
 
-        self.duty_cycle = 0
+        #self.duty_cycle = 0  # This line causes a write error when trying to enable
 
         # set frequency
         self.frequency = freq
['src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py']