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Ailurus

Member

Registered: 2011-05-17

Posts: 26

[ALSA] No sound after connecting monitor using DisplayPort cable

I just switched to a dual screen set-up, both monitors are connected to an Nvidia card (one using DisplayPort, the other one using HDMI). There's also a regular 3.5mm audio cable between the main monitor (DisplayPort) and the computer. Before, I used the main monitor using a HDMI cable (no second monitor).

Some more details —

$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default:CARD=PCH
    HDA Intel PCH, ALC221 Analog
    Default Audio Device
sysdefault:CARD=PCH
    HDA Intel PCH, ALC221 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC221 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=NVidia,DEV=0
    HDA NVidia, HDMI 0
    HDMI Audio Output
hdmi:CARD=NVidia,DEV=1
    HDA NVidia, HDMI 1
    HDMI Audio Output

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC221 Analog [ALC221 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Relevant output of lspci -k

00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
	Subsystem: Hewlett-Packard Company Device 1905
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel

01:00.1 Audio device: NVIDIA Corporation GK107 HDMI Audio Controller (rev a1)
	Subsystem: Hewlett-Packard Company Device 1106
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel

Screenshot of alsamixer — click. Notice the two Headphone channels (Headphone and Headphone+L0), the former without volume bar and the latter without mute option. As mentioned in the title, I don't have any sound at this point.

Ailurus

Member

Registered: 2011-05-17

Posts: 26

Re: [ALSA] No sound after connecting monitor using DisplayPort cable

The main problem turned out to be a setting on the main monitor (the audio input was set to DisplayPort instead of Line-In). However, this doesn't explain the two Headphone channels in alsamixer.

Last edited by Ailurus (2015-10-06 16:31:43)