I tested with the latest upstream kernel (v4.3-rc1-unstable) and the problem does not occur.
In summary :
linux-image-4.1.0-3-generic (4.1.0-3.3) amd64 : Ok
linux-image-4.2.0-7-generic (4.2.0-7.7) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report)
linux-image-4.2.0-10-generic (4.2.0-10.11) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report)
linux-image-4.3.0-040300rc1-generic (4.3.0-040300rc1.201509160642) amd64 : Ok (Act as kernel 4.1, no DRM stack trace)
I tested with the latest upstream kernel (v4.3-rc1-unstable) and the problem does not occur.
In summary :
linux-image- 4.1.0-3- generic (4.1.0-3.3) amd64 : Ok 4.2.0-7- generic (4.2.0-7.7) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report) 4.2.0-10- generic (4.2.0-10.11) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report) 4.3.0-040300rc1 -generic (4.3.0- 040300rc1. 201509160642) amd64 : Ok (Act as kernel 4.1, no DRM stack trace)
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