gma500: color distortion on framebuffer console unbind

[Baruch Siach]

Hi Patrik,

I am using the gma500 driver of the latest stable kernel, 4.8.1. My hardware
is Atom N2600 processor integrated graphics controller, PCI PID: 0x0be1. 
Output is LVDS. The system starts with framebuffer console enabled. Later in 
the boot process I unbind the console with the following command:

  echo 0 > /sys/class/vtconsole/vtcon1/bind

Immediately as the console is unbound some colors on the screen appear
distorted. The links below show the output of 'fb-test'
(https://github.com/prpplague/fb-test-app) before and after unbind.

  http://filebin.ca/2xxwlwtBBzBN/display-good.jpg
  http://filebin.ca/2xxxTyIboJnR/display-bad.jpg

Suggestions are welcome.

Thanks,
baruch

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