[Xiaomi Redmi 3 Questions & Answers] gbodurov:
Hello,

I tested with three different REDMI 3 devices and three different rom versions and have the following problem:

initially everything with connecting an external usb camera was ok. My usb camera app received events asking for permissions for using usb camera. But after 3 or 4 full charges the app stopped receiving permissions. I checked with couple other apps but again no permission. If my battery drops under 60% suddenly everything is ok again and the app detects the camera. It is stranger, that before full detect of the camera the app starts some kind of permission loop. I click allow and after 2 seconds the permission dialog shows again and so on... I checked the source code and appears my USBManager returns empty device list. For me it looks like some kind of battery optimizer or usb state optimizer doing it. I will be more than happy if someone can help me with this issue. Additionally I checked with all other stock rom version. It is all the same.

Here is some log from dmsg.

<6>[12449.627983] msm_otg 78d9000.usb: USB exited from low power mode
<6>[12449.647323] psy->name:usb
<6>[12449.652992] XXX::smb358_get_prop_batt_status:reg=0x0
<12>[12449.653558] healthd: battery l=94 v=4240 t=22.3 h=2 st=4 c=382 chg=
<6>[12449.744320] msm_hsusb_host msm_hsusb_host: EHCI Host Controller
<6>[12449.744844] msm_hsusb_host msm_hsusb_host: new USB bus registered, assigned bus number 1
<6>[12449.751356] msm_hsusb_host msm_hsusb_host: irq 166, io mem 0x078d9000
<6>[12449.769480] msm_hsusb_host msm_hsusb_host: USB 2.0 started, EHCI 1.00
<6>[12449.769624] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
<6>[12449.769636] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
<6>[12449.769646] usb usb1: Product: EHCI Host Controller
<6>[12449.769656] usb usb1: Manufacturer: Linux 3.10.49-perf-g48b885e ehci_hcd
<6>[12449.769665] usb usb1: SerialNumber: msm_hsusb_host
<6>[12449.772688] hub 1-0:1.0: USB hub found
<6>[12449.772729] hub 1-0:1.0: 1 port detected
<6>[12449.876761] msm_otg 78d9000.usb: USB in low power mode
<6>[12450.296922] msm_otg 78d9000.usb: USB exited from low power mode
<6>[12450.519306] usb 1-1: new high-speed USB device number 2 using msm_hsusb_host
<6>[12450.949089] usb 1-1: new high-speed USB device number 3 using msm_hsusb_host
<6>[12451.619450] usb 1-1: new high-speed USB device number 5 using msm_hsusb_host
<11>[12452.316729] init: Warning! Service eyecare needs a SELinux domain defined; please fix!
<11>[12453.339456] init: Warning! Service coloradjust needs a SELinux domain defined; please fix!
<6>[12453.759449] usb 1-1: new high-speed USB device number 13 using msm_hsusb_host
<6>[12455.879543] usb 1-1: new high-speed USB device number 21 using msm_hsusb_host
<6>[12456.212015] XXX::smb358_get_prop_batt_status:reg=0x0
<6>[12456.216663] psy->name:rk-bat
<6>[12456.216678] status=3, percent=94
<6>[12456.216684] status=3, percent=94
<6>[12456.222182] XXX::smb358_get_prop_batt_status:reg=0x0
<12>[12456.222723] healthd: battery l=94 v=4248 t=22.4 h=2 st=4 c=401 chg=
<6>[12456.319281] usb 1-1: new high-speed USB device number 22 using msm_hsusb_host
<11>[12457.382047] init: Warning! Service eyecare needs a SELinux domain defined; please fix!
<6>[12457.499222] usb 1-1: new high-speed USB device number 26 using msm_hsusb_host
<11>[12458.407239] init: Warning! Service coloradjust needs a SELinux domain defined; please fix!
<6>[12458.899381] usb 1-1: new high-speed USB device number 31 using msm_hsusb_host
<6>[12459.339269] usb 1-1: new high-speed USB device number 32 using msm_hsusb_host