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Hello,
I have an Dell XPS 13 9380 laptop with a fingerprint reader. I am/was aware that there are no drivers for this reader, and it won't work on Linux: not a big deal for me.
The problem that I recently discovered during the optimisations of battery usage is that it consistently draws from 1.5W up to 3W of power, being the most power-consuming piece of hardware in my laptop (okay, display backlight might be the most with max brightness, but that's just a sidenote )
I'd really like to disable it, so:
[xps krzyzak]# lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1050:0407 Yubico.com Yubikey 4 OTP+U2F+CCID
Bus 001 Device 003: ID 0489:e0a2 Foxconn / Hon Hai
Bus 001 Device 002: ID 0c45:6723 Microdia
Bus 001 Device 005: ID 27c6:5385
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Looks like
Bus 001 Device 005: ID 27c6:5385
is the one I'm looking for:
lsusb -v
Bus 001 Device 005: ID 27c6:5385
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x27c6
idProduct 0x5385
bcdDevice 1.00
iManufacturer 1 HTMicroelectronics
iProduct 2 Goodix Fingerprint Device
iSerial 3 HTK32
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x004b
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2 Communications
bFunctionSubClass 255
bFunctionProtocol 1
iFunction 2 Goodix Fingerprint Device
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC Call Management:
bmCapabilities 0x00
bDataInterface 1
UNRECOGNIZED CDC: 04 24 ff 02
CDC Union:
bMasterInterface 0
bSlaveInterface 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 255
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0000
(Bus Powered)
I've tried with:
echo "1-5" | tee /sys/bus/usb/drivers/usb/unbind
echo "suspend" > tee /sys/bus/usb/devices/1-5/power/level
but without any luck: fingerprint reader is still present in the powertop list.
I was also trying to find a way to disable it on BIOS level, but apparently, there's no option to do that there.
Is there any other option how could I disable it?
PS: I was initially strugling where should I put this post: whether to Kernel&Hardware or Laptop issues, decided to go here - if that's a wrong section, I'm really sorry about that
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Sorry to bump after so long but I found a solution for this so just posting here for posterity as this was the first post I found when looking for a solution to this problem.
Create /etc/udev/rules.d/disable-usb-device.rules:
ACTION=="add", ATTR{idVendor}=="27c6", ATTR{idProduct}=="5385", RUN="/bin/sh -c 'echo 0 > /sys/\$devpath/authorized'"
Originally taken from https://unix.stackexchange.com/question … nvironment
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