Public bug reported:

I have a GeForce 8600GT card and am using nvidia-340 drivers, version
340.101-0ubuntu0.16.10.1. Going into full screen mode results in a mode
smaller than the displayed area, where the mouse can be used to scroll
the screen viewport around. Returning from full screen mode does not
reset things back to the desktop mode, and instead leaves it in the same
mode. Both of these behaviours seem broken.

SDL 1 mode changes work. Also xrandr mode changes work. That's why I'm
reporting this as an SDL 2 bug, not an nvidia-340 bug. Earlier I dealt
with an nvidia-340 bug https://bugs.launchpad.net/ubuntu/+source/nvidia-
graphics-drivers-340/+bug/1671920 but that is solved and I don't think
that's why this is failing.

I'm attaching a small program which can be used to examine this behaviour. It 
can be built for SDL 1 and SDL 2 by supplying appropriate -I directory and -l 
libary, as in:
gcc -I/usr/include/SDL sdl_togglefullscreen.c -lSDL -o sdl_togglefullscreen1
gcc -I/usr/include/SDL2 sdl_togglefullscreen.c -lSDL2 -o sdl_togglefullscreen2

If reproducing this bug make sure xrandr is installed so you can go back
to your desired resolution if SDL 2 fails to go back to it. Use
something like xrandr --output DVI-I-2 --mode 1600x1200

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: libsdl2-2.0-0 2.0.4+dfsg2-1ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-41.44-generic 4.8.17
Uname: Linux 4.8.0-41-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Mar 10 17:09:30 2017
SourcePackage: libsdl2
UpgradeStatus: Upgraded to yakkety on 2016-10-13 (148 days ago)

** Affects: libsdl2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

** Attachment added: "Program for reproducing bug"
   
https://bugs.launchpad.net/bugs/1671954/+attachment/4835568/+files/sdl_togglefullscreen.c

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https://bugs.launchpad.net/bugs/1671954

Title:
  SDL 2 full screen mode changes broken with nvidia-340

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