PCI/internal sound card not detected

[Armin]

I installed ubuntu 16.04 and now I have no sound! Before that, I was using ubuntu 14.04 and
I had no problem with sound.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
NonfreeKernelModules: hid_generic usbhid hid i915 nouveau mxm_wmi wmi i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect ahci psmouse sysimgblt libahci fb_sys_fops r8169 drm mii video fjes
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Nov 24 23:57:57 2016
InstallationDate: Installed on 2016-11-24 (0 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/16/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 71CN31WW(V1.10)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 00000000INVALID
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Z500
dmi.modalias: dmi:bvnLENOVO:bvr71CN31WW(V1.10):bd11/16/2012:svnLENOVO:pn20202:pvrLenovoIdeaPadZ500:rvnLENOVO:rnINVALID:rvr00000000INVALID:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500:
dmi.product.name: 20202
dmi.product.version: Lenovo IdeaPad Z500
dmi.sys.vendor: LENOVO