After upgrading to 3.9.2 kernel, the sound did not work. However, the system CAN recognize my sound card, and my sound card appeared in `alsamixer` Downgrading the kernel can solve the problem. Providing more info: Acer Aspire laptop, with Intel i5 CPU, 2nd generation SandyBridge. `uname -a`:
Linux brilliant-laptop 3.9.2-1-ARCH #1 SMP PREEMPT Sat May 11 20:31:08 CEST 2013 x86_64 GNU/Linux
`lspci | grep Audio`:
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
`dmesg`:
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`cat .pulse/daemon.pa`:
default-sample-rate = 48000 alternate-sample-rate = 44100 default-sample-format = float32le
`cat /etc/modprobe.d/alsa-base.conf`:
options snd-hda-intel model=acer (This file aims to fix another bug. Trying to remove this file could not fix this problem. I paste this file only because it is related to sound.)
`lsmod`:
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