Hi, in my pc when i start my allegro program it crash with segmentation fault when i call the allegro function "al_reserve_function(1);". In other pc it doesn't happen then i have read the code of this function and it crash when try it "if(_al_kcm_driver->allocate_voice(voice) != 0)" then the problem can be caused by the audio driver. How i can check this?

I have Ubuntu 14.04 and i use codeblocks.

Thanks.

Do you call al_install_audio properly and check it's return value before calling al_reserve_samples? If al_install_audio returns false for some reason, you can't use any audio functions.

yes, the problem is in al_install_audio, i tryed to install libpulse-dev but don't work... and thanks for the answer

Do you compile Allegro yourself? You could paste a copy of the make output here, perhaps that will bring more clarity...

I use codeblocks, in the build log there aren't problems, what i can do to post more informations?

I assume audio otherwise works correctly on that computer? Could you try the audio-related Allegro examples and see if they work or not? If not, it may be an Allegro bug.

Try setting the default mixer BEFORE reserving samples, something like:

al_set_default_mixer(mixer);

The problem is the al_install_audio(), it return always false also in a simple project.
Declaring first the mixer the problem persist.

Ahh ok sorry - have you installed these?

libogg-dev
libvorbis-dev
DUMB

This is the important question to be answered. Ubuntu is basically the best supported platform for Allegro, so it all should just work assuming Allegro was built/installed properly.

EDIT: I should also say, that for starting, I'd recommend using our PPA: https://wiki.allegro.cc/index.php?title=Install_Allegro_from_Ubuntu_PPAs

nothing, the problem persist...
I try to format and install ubuntu 15.04.

Well, fwiw I use Ubuntu 14.04 and I have no problems .

Problem solved! I have installed the 15.04 version.;D

Most likely is was a driver problem then? Too bad we couldn't figure it out. But anyway, good to hear it works for you now.