[Henry Gomersall <heng@ca...>]

On Mon, 2011-05-09 at 19:37 +0100, Henry Gomersall wrote:
> I'll try the code with the proprietary driver and report back.
> 

Right, so I've had more of a play. Using the proprietary fglrx driver, I
have no problems (using the ATI HD4350 card), as expected from Mike's
tests (btw, all tests are using Ubuntu 11.04).

I've added another example test case to my github repository:
https://github.com/hgomersall/Blog-Code/tree/master/qml_with_simplegl_bugtest

This adds another two files called broken_wrapper.py and
hd4350_working_wrapper.py. The external calls that are made in each case
are identical and everything I know tells me the two wrappers should do
exactly the same thing. The only difference is an extra function layer
in hd4350_working_wrapper.py. The code that is run when either wrapper
file is executed is superficially identical to the code that is run when
gl_simple.py is executed. The outcomes however are quite different:

1) gl_simple.py executed: Everything works as expected on both the
desktop ATI HD4350 (running r600 driver) and the laptop Intel GMA X3100
(a red triangle and some sliders).
2) broken_wrapper.py executed: Hangs with both the desktop and the
laptop.
3) hd4350_working_wrapper.py executed: Runs as expected on the desktop
ATI HD4350 machine, but hangs on the laptop.

This is the first time if teased apart a difference between the laptop
and the desktop.

Does this suggest some kind of timing issue? The bug is starting to be
pretty unpredictable and really needs to be sorted, so assistance is
*much* appreciated.

Thanks,

Henry