Created attachment 105854 [details]
Test file with Motion Blur
I use both Windows 7 and Ubuntu 14.04
I have a problem with "Motion blur" in the Blender game engine
After I asked Blender Community they told me that may be there are a problem with Accumulation buffer (glAccum function) , Which necessary for this feature to work
I tested it in three different Blender version , but doesn't work .
it worked very well in Win7 and in another computer with Linux Mint and different Graphical card
GPU : Intel HD
CPU : Intel Celeron P4600
There are a .blend file attached with Motion Blur filter
To test it open the file and press P
Created attachment 105860 [details]
I attached an apitrace for easier debugging purpose.
Looks like Blender picked a visual with no accumulation buffer for some reason, then tried to use it. We advertise a few with accumulation buffers, so I'm not sure why it didn't pick one of those.
That said, accumulation buffers are going to be terribly slow (software rasterized, IIRC) on i965, and that's not likely to be fixed any time soon.
It would be great if Blender would move away from these legacy GL features...