** Description changed:

  I maintain a set of older kiosks running a mix of stock Ubuntu 14.04 LTS
  and 16.04.  As we have gradually transitioned them to 16.04, we have
- noticed that the machines running 16.04.3 now regularly exhibit problems
+ noticed that the machines running 16.04.1 now regularly exhibit problems
  restoring from the blank screen which appears after a period of
  This only occurs on the machines where we've installed 16.04.  All of
- the 16.04.3 installations are "fresh", that is, complete re-installs
+ the 16.04.1 installations are "fresh", that is, complete re-installs
  from scratch, and we install all security and other updates on a regular
  basis.  This problem has persisted right from the beginning when we
  started using 16.04.
  Following a period of user inactivity, the screen goes blank; this is,
  of course, expected.  When the user tries to restore the session by
  typing a key or moving the mouse, one of three outcomes occurs.
  Sometimes, the session restores normally.  Other times, the screen
  remains blank regardless of all normal keyboard input, until a magic
  SysRq  sequence is performed.  After Alt-SysRq-k, either the virtual
  console resets to a login screen (as expected after this SysRq
  sequence), or we get a kernel panic text screen (see attached screen
  photo) and can only restore via a hard power-cycle reboot.
  I will continue to try to capture a better trace output from one of
  these conditions, perhaps from /var/log/kern.log or by installing linux-
  crashdump (although these old machines may not have enough memory for
  the stock package).  But in the meantime, I'm attaching a photo of the
  kernel panic we see, which suggests a problem may reside in the Radeon
  driver ... which would seem possible, given the general blank-screen no-
  resume problem on these systems.
  Any advice on how to further capture any other needed details would be
  appreciated.  Thanks very much!

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  kernel panic in Radeon driver while screen blank

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