<fresh powered up system>
# cat $(find /sys -name camera_power)
[  140.121467] BTST: 0x1
[  140.121475] BTPS: 0x1
[  140.122378] BTEN: 0x1
1
<hw killswitch off>
[  199.296090] usb 4-1: USB disconnect, address 2
[  199.296789] btusb_intr_complete: hci0 urb f6990300 failed to resubmit (19)
[  199.296808] btusb_bulk_complete: hci0 urb f6990380 failed to resubmit (19)
[  199.297789] btusb_bulk_complete: hci0 urb f6990000 failed to resubmit (19)
[  199.297991] btusb_send_frame: hci0 urb f6766200 submission failed
[  199.784704] wlan0: deauthenticating from 00:1c:f0:e4:3d:a9 by local choice (reason=3)
[  199.786981] cfg80211: Calling CRDA to update world regulatory domain
[  200.852176] b43-phy0: Radio hardware status changed to DISABLED
# cat $(find /sys -name camera_power)
[  219.129098] BTST: 0x1
[  219.129105] BTPS: 0x1
[  219.130017] BTEN: 0x1
1
<hw killswitch on>
[  257.968055] usb 4-1: new full speed USB device using uhci_hcd and address 3
[  258.141407] usb 4-1: New USB device found, idVendor=0a5c, idProduct=2150
[  258.141420] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  258.141431] usb 4-1: Product: BCM2046 Bluetooth Device
[  258.141440] usb 4-1: Manufacturer: Broadcom Corp
[  258.141448] usb 4-1: SerialNumber: 0C6076DC9FD0
[  260.852114] b43-phy0: Radio hardware status changed to ENABLED
[  261.076117] b43-phy0: Loading firmware version 410.2160 (2007-05-26 15:32:10)
[  266.592252] b43-pci-bridge 0000:02:00.0: PCI: Disallowing DAC for device
[  266.592264] b43-phy0: DMA mask fallback from 64-bit to 32-bit
[  266.633509] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[  269.380720] wlan0: authenticate with 00:1c:f0:e4:3d:a9 (try 1)
[  269.382273] wlan0: authenticated
[  269.382689] wlan0: associate with 00:1c:f0:e4:3d:a9 (try 1)
[  269.385522] wlan0: RX AssocResp from 00:1c:f0:e4:3d:a9 (capab=0x431 status=0 aid=1)
[  269.385534] wlan0: associated
[  269.392770] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  279.928033] wlan0: no IPv6 routers present
# cat $(find /sys -name camera_power)
[  291.431607] BTST: 0x1
[  291.431614] BTPS: 0x1
[  291.433096] BTEN: 0x1
1
# rfkill block $(rfkill list | awk -F: '/ideapad_bluetooth/{print $1}')
[  341.416077] usb 4-1: USB disconnect, address 3
[  341.416547] btusb_intr_complete: hci0 urb f6747b80 failed to resubmit (19)
[  341.416559] btusb_bulk_complete: hci0 urb f6798300 failed to resubmit (19)
[  341.417546] btusb_bulk_complete: hci0 urb f674e080 failed to resubmit (19)
[  341.417944] btusb_send_frame: hci0 urb f67e5500 submission failed
# cat $(find /sys -name camera_power)
[  364.592492] BTST: 0x0
[  364.592499] BTPS: 0x1
[  364.593586] BTEN: 0x0
1
# rfkill unblock $(rfkill list | awk -F: '/ideapad_bluetooth/{print $1}')
[  392.192070] usb 4-1: new full speed USB device using uhci_hcd and address 4
[  392.312040] usb 4-1: device descriptor read/64, error -71
[  392.536066] usb 4-1: device descriptor read/64, error -71
[  392.752073] usb 4-1: new full speed USB device using uhci_hcd and address 5
[  392.872077] usb 4-1: device descriptor read/64, error -71
[  393.096059] usb 4-1: device descriptor read/64, error -71
[  393.312043] usb 4-1: new full speed USB device using uhci_hcd and address 6
[  393.720143] usb 4-1: device not accepting address 6, error -71
[  393.832051] usb 4-1: new full speed USB device using uhci_hcd and address 7
[  394.240083] usb 4-1: device not accepting address 7, error -71
[  394.240105] hub 4-0:1.0: unable to enumerate USB device on port 1
# cat $(find /sys -name camera_power)
[  458.669365] BTST: 0x1
[  458.669372] BTPS: 0x1
[  458.670744] BTEN: 0x1
1
# rfkill block $(rfkill list | awk -F: '/ideapad_bluetooth/{print $1}')
<absolutely no messages, no errors, nothing>
# cat $(find /sys -name camera_power)
[  576.981559] BTST: 0x0
[  576.981567] BTPS: 0x1
[  576.982900] BTEN: 0x0
1
# rfkill unblock $(rfkill list | awk -F: '/ideapad_bluetooth/{print $1}')
<absolutely no messages, device does not appear, no errors, nothing>
# cat $(find /sys -name camera_power)
[  652.939495] BTST: 0x1
[  652.939503] BTPS: 0x1
[  652.941192] BTEN: 0x1
1
<hw killswitch off>
[  701.234772] wlan0: deauthenticating from 00:1c:f0:e4:3d:a9 by local choice (reason=3)
[  701.237446] cfg80211: Calling CRDA to update world regulatory domain
[  702.036108] b43-phy0: Radio hardware status changed to DISABLED
# cat $(find /sys -name camera_power)
[  722.962717] BTST: 0x1
[  722.962724] BTPS: 0x1
[  722.964822] BTEN: 0x1
1
<hw killswitch on>
[  757.028180] b43-phy0: Radio hardware status changed to ENABLED
[  757.379142] usb 4-1: new full speed USB device using uhci_hcd and address 8
[  757.432136] b43-phy0: Loading firmware version 410.2160 (2007-05-26 15:32:10)
[  757.552383] usb 4-1: New USB device found, idVendor=0a5c, idProduct=2150
[  757.552396] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  757.552407] usb 4-1: Product: BCM2046 Bluetooth Device
[  757.552415] usb 4-1: Manufacturer: Broadcom Corp
[  757.552423] usb 4-1: SerialNumber: 0C6076DC9FD0
[  762.952258] b43-pci-bridge 0000:02:00.0: PCI: Disallowing DAC for device
[  762.952271] b43-phy0: DMA mask fallback from 64-bit to 32-bit
[  762.985688] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[  765.728762] wlan0: authenticate with 00:1c:f0:e4:3d:a9 (try 1)
[  765.730314] wlan0: authenticated
[  765.730738] wlan0: associate with 00:1c:f0:e4:3d:a9 (try 1)
[  765.734126] wlan0: RX AssocResp from 00:1c:f0:e4:3d:a9 (capab=0x431 status=0 aid=1)
[  765.734137] wlan0: associated
[  765.738373] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  775.760029] wlan0: no IPv6 routers present
# cat $(find /sys -name camera_power)
[  797.842123] BTST: 0x1
[  797.842131] BTPS: 0x1
[  797.843030] BTEN: 0x1
1