I'm having a similar issue with a Dell XPS 13 9360. I'm running Gentoo and kernel 4.9.0. COLD booting the laptop fixed it. After the cold boot the following line reappeared in the lspci command: 00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
Bugs looking similar had been referenced in various places: http://en.community.dell.com/techcenter/os-applications/f/4613/t/19999541 https://wiki.archlinux.org/index.php/Dell_XPS_13_(9343)#Sound_doesn.27t_work_after_upgrading_to_kernel_4.4.2B https://wiki.gentoo.org/wiki/Dell_XPS_13_9360#No_sound_card_detected -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1649727 Title: No sound card detected with device: Intel Corporation Device 9d71 Status in linux package in Ubuntu: Invalid Bug description: On a new Dell Inspiron i5378-2885GRY, the sound device is not detected by alsa, and the UI mixer shows a "Dummy" sound card. I've attached the ubuntu-bug dump for the laptop. I confirmed that snd- modules are loaded. The sound card is detected by lshw and lspci. It's a Intel Corporation Device 9d71. Fastboot is not enabled; boot is "thorough". The sound card *did* work on two separate occasions - i.e. was detected successfully. On all subsequent boots it is not detected. See also bugs 1641028 and 1649668. Googling for this device also shows a smattering of other problems that people are having with it. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1649727/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
