samsung 870z laptop microphone linux 

arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC282 Analog [ALC282 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0

S6

getprop ro.product.model # SM-G920F

130|zeroflte:/ $ df -h
Filesystem                     Size  Used Avail Use% Mounted on
tmpfs                          1.3G  824K  1.3G   1% /dev
tmpfs                          1.3G     0  1.3G   0% /mnt
/dev/block/dm-0                3.5G  3.4G  105M  98% /system
/dev/block/sda3                 16M  2.9M   13M  19% /efs
/dev/block/sda16               193M   10M  183M   6% /cache
/dev/block/sda18                25G  1.6G   24G   7% /data
/dev/block/sda13               4.9M  164K  4.7M   4% /persdata/absolute
/dev/block/sda14                11M  8.0K   11M   1% /sbfs
tmpfs                          1.3G     0  1.3G   0% /storage
/dev/block/sda17               5.8M  3.2M  2.5M  57% /preload
/data/knox/tmp_sdcard           25G  1.6G   24G   7% /mnt/knox
/data/knox/secure_fs/enc_media  25G  1.6G   24G   7% /mnt/shell/enc_media
/data/media                     25G  1.6G   24G   7% /storage/emulated
/data/knox/secure_fs/enc_user   25G  1.6G   24G   7% /data/enc_user
/mnt/shell/enc_media            25G  1.6G   24G   7% /mnt/shell/enc_emulated

amoled

Secret Menu: 

tel:*#0*#

Problem:

Solution:

https://android.stackexchange.com/questions/18302/can-i-set-the-minimum-brightness-of-auto-brightness?rq=1