[Bug 200526] [snd_hda] hissing/static noise from headphone jack on Dell Precision M4800

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat Feb 13 10:14:28 UTC 2016


hesitatej at gmail.com changed:

           What    |Removed                     |Added
                 CC|                            |hesitatej at gmail.com

--- Comment #7 from hesitatej at gmail.com ---
I have the similar problem on my Dell Latitude E6440, running a FreeBSD
10.1-RELEASE-p26. The built-in speaker works without any further configuration.
Upon plugging in the headphone, the speaker will be muted automatically, but
there is no sound (only a very low level static noise) coming through to the

The original configuration of the GPIO pins set by the operating system
(FreeBSD 10.1-RELEASE-p26) is 

hdaa1: <Realtek (0x0292) Audio Function Group> at nid 1 on hdacc1
hdaa1: Subsystem ID: 0x102805bd
hdaa1: NumGPIO=5 NumGPO=0 NumGPI=0 GPIWake=0 GPIUnsol=1
hdaa1:  GPIO0: disabled
hdaa1:  GPIO1: disabled
hdaa1:  GPIO2: disabled
hdaa1:  GPIO3: disabled
hdaa1:  GPIO4: disabled

I have written a script to use sysctl(1) to change the runtime tunable
"dev.hdaa.%d.gpio_config" into all possible (5^5=3125) GPIO pin-value
combinations, but none was able to make the headphone work.

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