[Bug 528524] Re: Sound not working in all apps on dove

[Li Li]

Add another finding here in case it is not mentioned before.

============ findings and investigation ==============

You can enable audio on ubuntu lucid as follows:

1.       Add USER ubuntu to audio group /* this seems has been fixed in the latest Lucid */
# sudo usermod –aG audio ubuntu

2.       Change pulse audio resample method
sudo vi /etc/pulse/daemon.conf
Change 
  resample-method = speex-float-1
to
  resample-method = trivial

3.       Sudo reboot
Then you can choose audio output and get audio enabled.

==================== Conclusion =====================

Why we need to add ubuntu to audio group may be a bug of lucid (should
have been fixed already).

The resample method can be set to any other values except speex-float-N
and it is caused by libspeex library issue.

BTW, trival method cast least CPU and the quality is acceptable.

==================== speex fix =====================

The libspeex includes three resampling methods: fixed point, generic
float point and SSE (intel specified float instruction set for X86).

Debian/rules will detect ARCH and configure "correct" resampling method.

Specially for X86, it will enable SSE. While for arm, it will enable
fixed-point only by default and suppose your platform is armv4 which
won’t support float-point.

By comment out this armv4 rule (see below), we can enable float-point
resample method on ARM, without effecting existing fixed-point.

ifeq ($(DEB_HOST_ARCH_CPU),arm)
objdir             = $(objdir_fixedpoint)
EXTRA_CONFIG_FLAGS = --enable-arm4-asm
endif

==>

ifeq ($(DEB_HOST_ARCH_CPU),arm)
#objdir             = $(objdir_fixedpoint)
#EXTRA_CONFIG_FLAGS = --enable-arm4-asm
endif

-- 
Sound not working in all apps on dove
https://bugs.launchpad.net/bugs/528524
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