Flex 2-14 speaker noise, driver problem ?

hi all,
recently bought flex-2 14 then noticed that the speaker is making noise like hisss, or static noise,
that happen when playing sound, even when the speaker is set to mute or plugging in a headphone,
after the sound had played, the noise gone. the noise came back again when playing another sound,
the noise can be heard clearly when the speakers in line/ parallel with the ears,
what really bothers me is when I mute the speaker/ plug a headphone, the noise is there,
already tried newest driver from realtek, but no luck.
spec :
OS Name   Microsoft Windows 8.1 Single Language
Version   6.3.9600 Build 9600
Other OS Description    Not Available
OS Manufacturer   Microsoft Corporation
System Manufacturer   LENOVO
System Model   20404
System Type   x64-based PC
System SKU   LENOVO_MT_20404_BU_idea_FM_Lenovo Flex 2-14
Processor   Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz, 2401 Mhz, 2 Core(s), 4 Logical Processor(s)
BIOS Version/Date   LENOVO A0CN27WW, 29/07/2014
SMBIOS Version   2.7
Embedded Controller Version   1.20
[edit: added current sound device info]
Name   Realtek High Definition Audio
Manufacturer   Realtek
Status   OK
PNP Device ID   HDAUDIO\FUNC_01&VEN_10EC&DEV_0233&SUBSYS_17AA3817&REV_1000\4&157DCDAD&0&0001
Driver   c:\windows\system32\drivers\rtkvhd64.sys (6.0.1.7188, 3,70 MB (3.882.456 bytes), 23/03/2015 9:22)
Name   NVIDIA Virtual Audio Device (Wave Extensible) (WDM)
Manufacturer   NVIDIA
Status   OK
PNP Device ID   ROOT\UNNAMED_DEVICE\0000
Driver   c:\windows\system32\drivers\nvvad64v.sys (1.2.27.0, 37,14 KB (38.032 bytes), 07/03/2015 12:28)

No proper fix. Workaround is to uninstall the Realtek driver and use the generic Windows driver.
https://forums.lenovo.com/t5/Lenovo-Edge-Yoga-Flex-Laptops/Yoga-2-Pro-Static-Noise-in-Headphone-Jack...
https://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T440s-speaker-noise/m-p/1339883
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W540-Speaker-hissing-sound/td-p/1426495
http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Static-using-headphones-on-Y40/td-p/1792343
https://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T440-electric-sparks-sounds/m-p/1799439
https://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Static-like-sound-coming-from-audio-jack-w...
https://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W550s-speaker-sounds/td-p/2055752
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https://forums.lenovo.com/t5/Lenovo-Edge-Yoga-Flex-Laptops/Yoga-2-Pro-Static-Noise-in-Headphone-Jack...
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****Click the White thumb to say thanks****
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