Noise hiss/static of the helmet; speakers OK (precision M4800)

I have a precision M4800, bought mid-March.  A week ago, I wanted to watch a video educational work without disturbing my neighbors, so I tried to plug the headphones into the socket (as opposed using speakers).  Move the bad: the neighbors could hear the static electricity in the front headphones that I tried to play all of the sounds around them.  (Yes, the noise was loud.)

Usual volume controls that work for the speaker had no effect on this noise in the headphones.

Now I run FreeBSD (stable/10 and head) on this machine - I have no idea how to do anything intentional in a Microsoft environment.  I keep the original disc supplied with the machine, so I could re - install that, in view of the detailed, explicit instructions on exactly what to do.  (Note: I swapped the drive until I turned on the machine for the first time, so that the player is currently 'intact'.)  Note 2: I field replaced the card wireless network, as Broadcom WLAN cards are pretty useless, at least for FreeBSD.  I still have the original card; I don't know if the Microsoft environment awaits the Broadcom adapter or not; If so, who should probably be part of the instructions.)

I raised the issue on one of the FreeBSD.org mailing lists; an answering machine mentioned a similar experience. noted that the helmet he used was for a smart phone and keys for a microphone; When he used the controls (FreeBSD) to completely mitigate the mic, its noise ceased.  I tried... without result.  I also tried a regular cheap helmet that had no possible connection microphone; my symptoms persisted.

Then, I noted that it might be interesting to determine if noise persists even before the start of the OS, so I had headphones plugged during a reboot cycle: they are SILENT as the BONE end and started hissing again just in the middle of this section of the device probes:

SMP: AP CPU launched #1!
SMP: AP CPU launched #4!
SMP: AP CPU launched #6!
SMP: AP CPU launched #7!
SMP: AP CPU launched #3!
SMP: AP CPU launched #5!
SMP: AP CPU launched #2!
Time counter 'TSC-low' quality of 1396794172 frequency 1000 Hz
Mount root waits: usbus2 usbus1 usbus0
uhub1: 2 ports with 2 removable, self-powered
uhub2: 2 ports with 2 removable, self-powered
uhub0: 21 ports with 21 removable, self-powered
Mount root waits: usbus2 usbus1 usbus0
ugen0.2: to usbus0
ugen2.2: to usbus2
uhub3: on usbus2
ugen1.2: to usbus1

The noise persists until the headphones are disconnected or restart the machine.

I found that the NVIDIA audio devices and RealTek are found by the kernel:

G1-254(10.1-S) [7] cat/dev/sndstat
Systems put in place:
PCM0: (game)
pcm1: (game)
mcp2: by default (play/REC/WAV)
pcm3: (play/REC/WAV)
G1-254(10.1-S)

I opened the machine up a little bit to see if there is something obviously wrong (for example, a wire loose), but I was not able to access this part of the material without indulging in a more invasive surgery than I care to do to a machine that is still under warranty.

At this point, just trying to determine if it is a hardware problem, or if I need "merely" encourage appropriate to a FreeBSD driver changes.

I ran FreeBSD on laptops since 2000, and I have never come across anything like this before.  (Portable computers were Dells in the last decade or so, more recently, a Precision M4400, which lasted approximately 7 years.)  I'll need to replace the laptop of my spouse soon enough so I would be able to get an another M4800 - but she'll want it runs FreeBSD, so, if this is going to be a problem, we will need to carefully assess and consider our options.

dwolfskill
I keep the original disc supplied with the machine, so I could re - install that, in view of the detailed, explicit instructions on exactly what to do.

Hello. You can get job M4800 here mode accuracy

http://downloads.Dell.com/manuals/all-products/esuprt_laptop/esuprt_precision_mobile/precision-m4800-workstation_Owner%27s%20Manual_en-us.PDF

This document is in fact a repair with detailed instructions on the replacement of components, including the hard drive, complete with illustrations. The manual can be viewed in a browser, but it works better if opened in a PDF reader.

The first time you run Windows, you must go through the initial setup - select the time zone & make some choices. It is explicit, because people of all levels of the end, but it might be helpful to have the assistance of a Windows user. For your probably no matter how you complete the Setup you want just finished start up. Windows prompts you to create the recovery media, whose goal is to be able to install the factory to a new disk configuration hard if the original one breaks down eventually.

Once the computer finishes booting in Windows, if you hear the noise, then it would be a hardware failure such as a bad guess. I don't think you need to do something more at this time, such as files audio performance or connect to the internet. If you do not connect to the internet, then Windows will want to download and install the updates that is not desirable for the purposes of tests, because the updates will change the factory setting. The factory setting is the default configuration in which the audio should work fine. There should be no need to try to adjust the audio controls or other tweaks to try to eliminate a very obvious noise as you have described.

On the Broadcom adapter, to win a stage I would first try with your current wireless card and ignore the error messages is they pop up. If you don't have the noise on Windows with your current card, assumed that the problem is in the configuration of FreeBSD. If you don't have the noise in Windows then put the Broadcom card back in to exclude from your new card as a factor. [In the past, wireless cards were an important source of noise issues, but not so much anymore, and to the best of my knowledge no would cause great noise in the helmet but not pregnant.]

The audio driver on the original hard drive will be a Realtek audio driver. There is a way to replace the native Windows audio driver Realtek driver and I can provide these instructions if you want.

If the problem is caused by hardware that Dell will fix it if you are still under warranty, but it will probably require your machine to have the initial hardware configuration before providing support. If is no longer under warranty, I suggest using an input jack simple usb audio for audio for headphones.

If you don't have the noise after Windows starts, then the assumption is that the problem exists only in your configuration of FreeBSD. I can't help you with that at all. Maybe someone on our operating system board would have an idea, but I'm not familiar with your operating system at 100%.

In the same sense I know not how or if the BIOS is for FreeBSD and if or not you need to update the BIOS. I have looked through the notes of all revisions of the BIOS for your model, but see no mention of patches of audio.

dwolfskill
I found that the NVIDIA audio devices and RealTek are found by the kernel:

The Realtek's chip audio codec built-in on the motherboard - the main audio system. The nVidia would be the system audio HDMI - for audio that is sent to another device via the HDMI port. It is a subsystem of the system nVidia graphics.

Tags: Dell Laptop

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