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Created attachment 2486 [details]
Render output after switching from initial fullscreen to deskto fullscreen mode

I am using SDL2 from hg (changeset 10179 7cbfd97f1430) and experience issues when switching from fullscreen mode to fullscreen desktop mode. To reproduce the problem, run

./testdraw2 --fullscreen
press Shift+Enter to switch to desktop fullscreen mode.

Expected behavior: correct rendering at desktop resolution
Actual behavior: rendering at correct resolution, but only the (possibly 640x480 sized) top left part of the screen shows something, the remainder is black (see attached screenshot).


This happens on both Ubuntu 14.04 and 16.04, using standard Unity desktop and the nvidia binary driver.

14.04
nvidia 352.63
Linux Britannia 3.19.0-59-generic #66~14.04.1-Ubuntu SMP Fri May 13 17:27:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
X.Org X Server 1.15.1

16.04
nvidia 361.42
Linux Trinsic 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
X.Org X Server 1.18.3


For what it's worth, it is possible to get it to render correctly, by executing the following sequence:
./testdraw2 --fullscreen
Shift+Enter (now it's fullscreen desktop, but broken)
Alt+Enter (now it's in window mode, correctly)
Shift+Enter (now it's fullscreen desktop, correctly)
And from now on, repeated Shift+Enter correctly toggles fullscreen and fullscreen desktop


Since the behavior can easily reproduced with SDLs own test program, there's probably no need to point to my own application that suffers the issue, but for completeness sake:
http://cvs.savannah.gnu.org/viewvc/adonthell-0.3/?root=adonthell
http://cvs.savannah.gnu.org/viewvc/wastesedge/?root=adonthell
First module contains the engine, second the data.