[Xiaomi Mi 5 Questions & Answers] Thanatos0785:
Low call volume

I had the same problem so i searched around and could not find any directly answering this problem. Had the problem before on my note 2 and was able to correct it by editing files in root. So i searched for which files to look at and I think I finally got it to work. BTW im on eu ROM. Was not rooted initially but was on TWRP.

1.) Searched for superSU

2.) Booted to TWRP recovery and flashed for root access

3.) Opened ES file explorer. Press tab on the left side and look for root explorer and enabled it by short press(allow when prompted).

4.) Long press on root explorer and a prompt will appear with selection. Select Mount R/W (2nd to the last option)

5.) Another prompt will appear with the directory on the left side and RO or RW option on the right. Look for /system and change it to RW.

6.) Go to main screen and press left tab again and under Local you will see Device. Select it.

7.) Look for system folder then etc folder

8.) Look for mixer_paths.xml and open it using ES note editor

9.) Along the first part you will see these lines

<ctl name="RX1 Digital Volume" value="84" />

<ctl name="RX2 Digital Volume" value="84" />

10.) The default value is 84 and it actually goes up to RX8

11.) I changed the value from 84 to 93 for all of those.(RX1-RX8)

12.) Under that you will also see this:

<ctl name="DEC1 Volume" value="93" />

<ctl name="DEC2 Volume" value="93" />

<ctl name="DEC3 Volume" value="93" />

<ctl name="DEC4 Volume" value="93" />

<ctl name="DEC5 Volume" value="93" />

<ctl name="DEC6 Volume" value="93" />

<ctl name="DEC7 Volume" value="93" />

<ctl name="DEC8 Volume" value="93" />

<ctl name="DEC9 Volume" value="93" />

<ctl name="DEC10 Volume" value="93

13.) The default value for this is also 84 and as you can see above i changed mine to 93 also.

14.) By this time i pressed back and chose yes when prompted to save.

15.) Went back to the RW selection and changed /system back to RO(default)

16.) Did a reboot of the system.

17.) Checked by making a call. Sounded a little louder than before but not by much (could be placebo). So went back to ES.

18.) Did step 3 to step 7

19.) Opened mixer_paths_i2s.xml and mixer_paths_tasha.xml

20.) Changed the values similar to the ones i changed in mixer_paths.xml. Take note that on these 2 files RX1-8 may not be complete e.g RX1-RX4 only. Same thing with DEC1 volume. Anyways I just changed what was there on the first part for both files. At the end i had a value of 93 for these parts.

21.) Did steps 14-16.

When i tested this again it was definitely louder than during the first part. I asked a friend to check it out and she agrees that it definitely is louder than when we checked it the first time. I did notice it to be a bit scratchy though. Have to check with regards to movies and audio on the long run but so far it sounds ok. You could increase it to a higher value than 93 but then again that is a risk you take. Its not like you could easily get a speaker for the MI5 from your local store. Anyways thanks to [MENTION=5280609]yorikkk[/MENTION] and [MENTION=5611971]drishd[/MENTION], for the ideas you saved my ears.?