[Libva] test/decode sample shows blank window

[Paul A. Steckler]

I'm able to build libva and the test programs on my Linux Mint
laptop, which has an Intel GPU, which "lspci" identifies as "Intel
Corporation 3rd Gen Core processor Graphics Controller".

I'm particularly interested in getting the test/decode sample to work.
When I run it, with an argument so that the the frame should be displayed,
I get an X window to appear, but it's blank.

There is text output that shows calls to va_GetDriverName() and va_openDriver(),
both of which return 0 (success). The driver that's loaded is called
i965_drv_video.so.

Is this a known issue? Can you suggest a way to debug it?

-- Paul