I have the same trouble in Ubuntu 12.04,
Notebook: Acer aspire 5553G
Soundcard: Realtek ALC271X (Windows say that it is ALC269).
First I want to say that this is NOT Linux bug, this is Windows 7 bug, or
Realtek audio driver for Windows 7 bug.
So, I have not found a solution for Windows, but I found a workaround for Linux.
Workaround:
edit file: /etc/init.d/reboot
In function "do_stop ()" replace command "reboot -d -f -i" to the command
sequence:
=-=-=-=-
sync
echo u > /proc/sysrq-trigger
sleep 1s
echo b > /proc/sysrq-trigger
=-=-=-=-
Now I have working sound in Windows 7 after reboot from Ubuntu 12.04.
Workaround explanation:
I found that the driver (shd_hda_intel) during unloading/uninit completely
disables sound card. So this buggy Windows 7 cannot enable it again. To prevent
driver uninit while reboot, I do emergency reboot (like pressing Alt+SysRq+B)
instead of normal reboot, so kernel and drivers does not do uninit functions,
and soundcard stay enabled.
Using this workaround two days, seems like all goes fine. But be carefully,
there may be consequences.
P.S. Sorry for my english.
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https://bugs.launchpad.net/bugs/1201372
Title:
Losing sound in Windows after rebooting from Linux (Realtek ALC269VB)
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