Bug#912925: glx-diversions: should divert libGL.so when other libraries are diverted to NVIDIA as pyqt5 breaks otherwise

Andreas Beckmann anbe at debian.org
Tue Nov 6 16:16:29 GMT 2018

On 2018-11-06 14:29, Julian Gilbey wrote:
> On Mon, Nov 05, 2018 at 11:03:11PM +0100, Andreas Beckmann wrote:
>> Does your testcase run under bumblebee?
> I don't know; I could try when I'm next at my desktop.  I don't have
> bumblebee installed (it seems to be intended for laptops).

Well, you need a laptop with optimus for this, and I would expect your
test case to break there, because optirun works with setting
LD_LIBRARY_PATH to make the accelerated libraries (libGL.so.1 and
friends) found by the programs run under optirun. That would probably
result in the MESA libGL.so being dlopened.

> Another thing I've thought of doing is wrapping the dlopen library
> call to trace all calls to hopefully locate the source of the issue.
> But I still don't understand why you would not divert libGL.so when
> libGL.so.1 is being diverted - it doesn't make any sense to me.

We are diverting it (otherwise it would be a dangling symlink) - we just
set the alternative unconditionally to the diverted one because we don't
want anything to get linked against the proprietary libraries at compile


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