I see this is syslog when pressing to focus (which should turn on the flashligh)
Jan 29 12:47:51 ubuntu-phablet kernel: [  604.588298] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c3(nr=195), senorDev=0x1 ledId=0x1 arg=0xb3f049dc
Jan 29 12:47:51 ubuntu-phablet kernel: [  604.588382] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: FLASH_IOC_IS_CHARGER_IN 
r=1[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c8(nr=200), senorDev=0x1 ledId=0x1 arg=0xb3f049e0
Jan 29 12:48:01 ubuntu-phablet kernel: [  604.588441] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: FLASH_IOC_IS_CHARGER_IN 
r=0[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453cd(nr=205), senorDev=0x1 ledId=0x1 arg=0xb3f049c4
Jan 29 12:48:01 ubuntu-phablet kernel: [  615.183466] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c3(nr=195), senorDev=0x1 ledId=0x1 
arg=0xb3f049dc[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: FLASH_IOC_IS_CHARGER_IN 
r=1
Jan 29 12:48:01 ubuntu-phablet kernel: [  615.183577] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c8(nr=200), senorDev=0x1 ledId=0x1 
arg=0xb3f049e0[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: FLASH_IOC_IS_CHARGER_IN 
r=0
Jan 29 12:48:09 ubuntu-phablet kernel: [  615.183610] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453cd(nr=205), senorDev=0x1 ledId=0x1 
arg=0xb3f049c4[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c3(nr=195), senorDev=0x1 ledId=0x1 arg=0xb3f049dc
Jan 29 12:48:09 ubuntu-phablet kernel: [  623.123667] 
[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: FLASH_IOC_IS_CHARGER_IN 
r=1[KD_CAMERA_FLASHLIGHT]flashlight_ioctl: flashlight_ioctl 
cmd=0x800453c8(nr=200), senorDev=0x1 ledId=0x1 arg=0xb3f049e0

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to camera-app in Ubuntu.
https://bugs.launchpad.net/bugs/1539708

Title:
  Flash does not work on Mx4 when connected to USB

Status in Canonical System Image:
  New
Status in camera-app package in Ubuntu:
  New

Bug description:
  using stable image ota9 camera-app version 616

  the flash does not work at all, even when manually enabled, torchlight
  never lights when pressing for focus

To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1539708/+subscriptions

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