Surface Pro 4, annoying noise from the back!

Me too had that blizzard electrical noise with 2 m3 version.

One purchased from amazon lot number 1545 and the second one from MS store lot number 1549.

Returned both because was really annoying and not acceptable.

Never had similar issue with Pro 2/3 and Surface 3 2.5 years now I'm using surface tablet.

Now I'm using i5 version purchased from amazon lot 1549 and not having that kind of noise.

But I have an issue with brightness setting.

When put to manually setting some time its not responsive and act as I put it to automatically.

Very blizzard issue.

If continue next few days same issue I will return and the third one.

MS has to do something with the quality control on Pro 4.

Its embarrassing.

I have SP4 i5/8GB/256GB and the same issue with the noise by the brightness level.

I don't want to rehash too much, but here's a summary of all the information I have so far for anyone who is interested:

• My Surface Pro 4 i5 4GB/128GB emits a faint high-pitched noise/whine.  The noise is very similar to the sound of ringing in the ears after hearing a loud sound.  It can be most clearly heard along the top edge of the tablet next to the camera sensors, but also on the top right edge and bottom right edge.  This whine cannot be easily noticed when there are ambient sounds; however, it is very disturbing when I'm studying in a library or quiet room.
• The noise is affected by the brightness level:
  • It is most quiet at 0% and 100% brightness.
  • It is progressively louder from 25% to 75% brightness.
• The registry hack mentioned earlier in this thread did not affect the noise (unless I performed it incorrectly - I received a command prompt error message when deleting the setting that said the setting was not there, even though I added it w/ admin privileges).
• I have been able to rule out the following causes:
  • The CPU fan
  • The audio speakers
  • The sound is not the ringing in my own ears - I can control the level by changing the screen brightness
• The sound was not present on my Surface Pro 3
• I have heard the sound on multiple units:
  • The sound was present on my Surface Pro 4 as soon as I turned it on for the first time, and remained even after I installed all available updates.
  • I recently received two replacement units, and it was present on both units immediately after booting them up, and remained after installing all updates.
  • I have since checked other SP4 i5 units at the Microsoft Store and Best Buy, and I can hear the sound on all of them.
• Other people have confirmed they also can hear the high-pitched sound:
  • People I know and one technician at the Microsoft Store said they could hear the sound.
  • SP4 owners on various forums have confirmed that they can also hear the sound.  These include owners of my version (i5 4GB/128GB), as well as m3 versions. For example:

https://www.reddit.com/r/Surface/comments/3s19nu/very\_high\_pitched\_noise\_coming\_from\_sp4/

Information I would like to gather:

• Is this issue present on other configurations of the Surface Pro 4, such as the i5/8GB/256GB and i7 versions?
• Will Microsoft release a software/firmware update that addresses this issue?  If so, when?

UPDATE: (01/08)

Users have stated they have the high-pitched noise with the following models:

• Core m3
• Core i5 4GB/128GB
• Core i5 8GB/256GB

I'm at the Microsoft Store right now trying to work this out.  The technician has been very helpful and patient with me as I've been trying to describe a problem that only some people can hear.  I've checked multiple Surface Pro 4 i5 tablets in the store, and I can hear the sound on every one I've checked.  They gave me a second replacement unit, and after installing all updates, I can still hear the high-pitched sound.  I'm trying to figure out what to do next.  Does anyone know who I can contact to find out whether this is an issue that will be addressed in a future update?  If the issue will be addressed, then I will keep the tablet.  If not, I will likely have to return the device :-(