exactly the same problem on toshiba satellite l750 1h3 with ubuntu 14.04 lts
i added these lines to etc/modprobe.d/alsa-base.conf:
options snd-hda-intel enable_msi=1
options snd-hda-intel model=ideapad
options snd-hda-intel power_save=0
options snd-hda-intel power_save_controller=0
the problem is
windows 7 x86_64 also affected for me since i use the laptop as dualboot
with ubuntu
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https://bugs.launchpad.net/bugs/1038479
Title:
[Satellite L755, Conexant
*** This bug is a duplicate of bug 1038479 ***
https://bugs.launchpad.net/bugs/1038479
** This bug has been marked a duplicate of bug 1038479
[Satellite L755, Conexant CX20585, Speaker, Internal] fails after a while
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Public bug reported:
no sound after few minutes
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.2
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