I probably had asked this question before, but I had no proper solution and probably, the thread seems to be obsolete. I use internet with Ethernet (the drivers are downloaded from my hardware manufacturer, Realtek, and I have also tried the one that came bundled with Debian 8.1). However, I found my ethernet connection missing (reports cable unplugged in gnome-settings), after the system wakes from sleep.
Need a fix!
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Himanshu Shekhar
IIIT-Allahabad
IRM2015006