Comment 10 for bug 1377653

Revision history for this message
Rudi Daemen (fludizz) wrote :

I am not sure this is an alsa-specific bug. Looks to be more of an issue with the Nvidia card and the way it handles HDMI audio. This also affects a BTO 15CL76 notebook (I7-6700HQ / GTX1060) set in DISCRETE mode. No HDMI audio device shows up at all. The active nvidia driver (as of writing) is nvidia_367. No bbswitch/bumblebee installed as Hybrid mode is disabled.

Suggestions on the nvidia forum are to shutdown your X environment and then run the following commands as root: https://devtalk.nvidia.com/default/topic/609790/linux/no-hdmi-sound-w-optimus-in-linux/

rmmod nvidia
echo 1 > /sys/bus/pci/devices/0000\:00\:01.0/remove
echo 1 > /sys/bus/pci/rescan

This also had no effects - the Nvidia device comes back online but without the audio device showing up.

Here's the output of lspci -H 1:
fludizz@tongerlo:~$ sudo lspci -H 1
00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1)
00:1c.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #7 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1c60 (rev a1)
6d:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5287 (rev 01)
6d:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)
6e:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
6f:00.0 Non-Volatile memory controller: Intel Corporation Device f1a5 (rev 03)