[Bug 10431] snd-usb-audio causes system instability on boot, manual modprobe works fine

[bugzilla-daemon at bugzilla.ubuntu.com]

Please do not reply to this email.  You can add comments at
http://bugzilla.ubuntu.com/show_bug.cgi?id=10431
Ubuntu | linux





------- Additional Comments From fabbione at ubuntu.com  2005-06-03 17:09 UTC -------
(In reply to comment #7)
> Created an attachment (id=2598)
 --> (http://bugzilla.ubuntu.com/attachment.cgi?id=2598&action=view) [edit]
> same as the above OOPS, with untainted kernel
> 
> Steps to reproduce:
> 
> 1 - boot computer with USB audio hardware turned on (ESD is now the only
> soundserver which works)
> 2 - (while no sounds are being played through the speakers) turn off USB audio
> hardware when logged in (sometimes the crash happens here, freezing the
> keyboard)

even if you are not playing any sound, the card is in use by ESD. ESD makes a
permanent
lock on the card. Still the kernel should not OOPS.

> 3 - reboot computer. computer will hang with the OOPS printed on screen,
> requiring a hard reset.
> 
> Additional info: I cannot get the crash to occur if I turn on the USB audio
> hardware *after* logging in the gnome, i.e. if ALSA is used for sound and not
> ESD.

The difference is that ESD is not binded to the card at all. I would be surprised
if the card acttually works in that situation (with ESD application, alsa and oss
would work for other reasons)

> 
> My question is - what does hotplug do differently when handling the soundcard
> at boot, than while logged in to GNOME? If it handles the sound at boot only
> ESD will work, and if it handles the sound after logging in to GNOME only ALSA
> will work.

The difference is that at boot time hotplug is doing a lot of work. Once you are
logged in hotplug has to handle only your card.

fabio

-- 
Configure bugmail: http://bugzilla.ubuntu.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the QA contact for the bug, or are watching the QA contact.