ubuntu-x-swat team mailing list archive

[knarf <launchpad-ubuntu-f@xxxxxxxxxxxx>]

OK, I have made some progress with Clutter and the savage. There are two
things at play here:

1) clutter always requests non-zero alpha depth when looking for
visuals. The savage driver does not support non-zero alpha depth so it
does not return any visuals. Clutter uses RGB visuals by default but
clutter-gtk wants RGBA. I patched clutter to not request non-zero alpha
depth and can now run clutter-based apps.

2) clutter fails to catch the failure to acquire a visual - and hence an
OpenGL context - and blindly tries to call OpenGL functions. This is not
possible without a context, which leads to the segfaults seen here (and
elsewhere).

I changed clutter to get rid of this request and suddenly it works -
sort of. That alpha request is there for a reason so the savage driver
should be changed to either support alpha (difficult if the hardware
does not offer support) or ignore the alpha request.

For now clutter is semi-usable when patched. I'm running clutter 1.2.2
so the patch is not applicable to the version currently used in Ubuntu.
I'll have a look at implementing alpha support in the savage driver
which would be the real solution to this problem.

-- 
netbook-launcher crashed with SIGSEGV in glGetString()
https://bugs.launchpad.net/bugs/467474
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