我有一部诺基亚 230 手机（基本型号）。
我正在使用 Arch Linux。我能够使用 USB 将手机连接到我的笔记本电脑，并能够使用pcmanfn（文件管理器）查看存储文件。我曾经在连接到笔记本电脑时收到通知。
最近我升级了我的 Arch Linux。之后我就无法看到手机中的文件了。没有来自pcmanfm（文件管理器）的通知。
我检查了dmesg。当它连接时，它会说：
usb 2-3: new high-speed USB device number 35 using xhci_hcd
lsusb显示：
Bus 002 Device 035: ID 0421:06c6 Nokia Mobile Phones
lsusb -vvv
Bus 002 Device 035: ID 0421:06c6 Nokia Mobile Phones
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0421 Nokia Mobile Phones
idProduct 0x06c6
bcdDevice 3.39
iManufacturer 1 Nokia
iProduct 2 Nokia 208 Dual SIM
iSerial 3 357911050027165
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 39
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 6 Imaging
bInterfaceSubClass 1 Still Image Capture
bInterfaceProtocol 1 Picture Transfer Protocol (PIMA 15470)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
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 10
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0000
(Bus Powered)
如何知道问题所在并获取我的文件？