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/sys filesystem changes from Android 6 to 7

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Posted at 1/5/2018 06:07:05     
In Android 6.0.1, I was doing some testing with attributes in:

/sys/devices/virtual/display

I updated to Android 7.1.1 and now this path no longer exists. Does anyone know why? Is there a way to re-enable this?
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Posted at 1/5/2018 10:13:51     
Android 7.1 display subsystem have already change the DRM driver .
/sys/class/drm
or u just search the key word "drm" under entire dir
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Posted at 1/6/2018 01:32:14     
Thanks for your reply. I did see this, but the entries are different so I wasn't sure if this was correct. I am looking at the HDMI attributes. They don't seem to match the attributes in the rockchip driver source. Does the Android 7 kernel use different video drivers than the kernel in Android 6?
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