can you check if the keys are mapped with this command?
adb shell su -c 'getevent -lt'
It shows the live events after starting you have to press the button(s) which aren't working.
thx for the feedback
I don't know what you mean with the icons. But if you are comparing the size between cm10.2 and miui you should know that miui's icons are larger than normal. If you like that you can install MiHome Launcher from playstore.
Since Whatsapp is causing the battery drain and not android I can't fix this. it's a problem of this app I think.
No I also had idle battery drain, It got drained around 15% for 9hrs , Is it normal?
From 31 to 16
But when using the phone its way better than MIUI