On 15/06/12 07:28, Alan Chandler wrote:
On 14/06/12 22:27, Alan Chandler wrote:
I upgraded my sid system with the latest set of packages.
I have now lost by sound, but I am not sure why.
When I run alsamixer as root I see a device that appears to be the
sound chip on my motherboard, and using aplay to send a .wav file works.
If I run as me - a user, alsamixer shows a "pulseaudio" card as the
only card. Playing the wave file does nothing.
I presume I have a pulseaudio problem, but I don't know what to do
about it.
If I look at the sound settings in the Gnome System Settings, it says
be sound output is a "dummy card". I don't know whether that just
implies its going via pulse-audio, or that pulse audio has not found
a real device and is using a dummy one.
NOTE: the same upgrade seemed to screw up udevd - I get an error
message about failing to queue file, and I have to unplug and replug
my usb mouse and keyboard to make them work.
I got my sound back - at least temporarily.
There appeared to be two copies of the udevd daemon running. I killed
all copies of it and then restarted it once. Then I restarted
pulseaudio and now I have sound.
So my instinct that the problem with udev is the root cause seems
correct. However I have yet to find out what is the problem with that.
It is still not fixed for me. I am getting the udev errors during
startup and then get to the logon point with no mouse or keyboard. To
get them, I have to unplug and plug them in again and they come back. I
can then login.
Once I am at my desktop I can run a root terminal window, kill of udevd
and restart it and then I get my sound back.
The thing I can't see how to track down is what is causing the spate of
errors at the beginning. It is almost like there is an ordering problem
with all the things running in parallel, and that when udevd first runs,
the /dev directory is not in place (I think the failing to queue files
is an indication that udevd can't write to the /dev directory - but I am
not sure in the boot process why).
--
Alan Chandler
http://www.chandlerfamily.org.uk
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