libmtp

I've transfered quite a few files to the iRiver in MTP mode but now can't
connect at all. libmtp utilities whine about LIBMTP PANICs. Amarok can't
connect at all.

As root, mtp-detect gives:
libmtp version: 0.2.4

Attempting to connect device(s)
PTP: Opening session
Detect: Successfully connected 1 devices
Error 2: PTP Layer error 02fd: get_all_metadata_fast(): could not get
proplist of all objects.
Error 2: (Look this up in ptp.h for an explanation.)
Error 2: PTP Layer error 02fe: get_handles_recursively(): could not get
object handles.
Error 2: (Look this up in ptp.h for an explanation.)
USB low-level info:
Using kernel interface "usbfs"
bcdUSB: 512
bDeviceClass: 0
bDeviceSubClass: 0
bDeviceProtocol: 0
idVendor: 4102
idProduct: 1126
IN endpoint maxpacket: 512 bytes
OUT endpoint maxpacket: 512 bytes
Device flags: 0x00000000
Microsoft device descriptor 0xee:
0000: 1203 4d00 5300 4600 5400 3100 3000 3000 ..M.S.F.T.1.0.0.
0010: 0100 ..
Device info:
Manufacturer: iriver
Model: iriver clix
Device version: MTP-1.14-N-ENG
Serial number: AA5504BABE4F3231313230310F0F0607
Vendor extension ID: 0x00000006
Vendor extension description: microsoft.com/WMDRMPD: 10.1;
microsoft.com/WMPPD: 10.0; audible.com: 1.0; microsoft.com/AAVT: 1.0;
microsoft.com/WMDRMND: 1.0;
Detected object size: 64 bits
Supported operations:
1001: get device info
1002: Open session
1003: Close session
1004: Get storage IDs
1005: Get storage info
1006: Get number of objects
1007: Get object handles
1008: Get object info
1009: Get object
100b: Delete object
100c: Send object info
100d: Send object
100f: Format storage
1014: Get device property description
1015: Get device property value
1016: Set device property value
101b: Get partial object
9801: Get object properties supported
9802: Get object property description
9803: Get object property value
9804: Set object property value
9805: Get object property list
9806: Set object property list
9808: Send object property list
9810: Get object references
9811: Set object references
9101: Get secure time challenge
9102: Get secure time response
9103: Set license response
9104: Get sync list
9105: Send meter challenge query
9106: Get meter challenge
9107: Get meter response
9108: Clean data store
9109: Get license state
910a: Send WMDRM-PD Command
910b: Send WMDRM-PD Request
9201: Report Added/Deleted Items
9170: Open Media Session
9171: Close Media Session
9172: Get Next Data Block
9173: Set Current Time Position
9180: Send Registration Request
9181: Get Registration Response
9182: Get Proximity Challenge
9183: Send Proximity Response
9184: Send WMDRM-ND License Request
9185: Get WMDRM-ND License Response
Events supported:
None.
Device Properties Supported:
0x5001: Battery Level
0xd401: Synchronization Partner
0xd402: Friendly Device Name
0xd405: Device Icon
0xd101: Secure Time
0xd102: Device Certificate
0xd100: Unknown property
Playable File (Object) Types and Object Properties Supported:
3000: Undefined Type
ptp2/ptp_usb_getdata: detected a broken PTP header, code field insane.
3001: Association/Directory
PTP: Sequence number mismatch 21 vs expected 22.
3004: Text
PTP: Sequence number mismatch 22 vs expected 23.
3009: MP3
PTP: Sequence number mismatch 23 vs expected 24.
300a: MS AVI
ptp2/ptp_usb_getdata: read 1 bytes too much, expect problems!
PTP: Sequence number mismatch 24 vs expected 25.
300c: ASF
PTP: Sequence number mismatch 25 vs expected 26.
3801: JPEG
ptp2/ptp_usb_getdata: read 1 bytes too much, expect problems!
PTP: Sequence number mismatch 26 vs expected 27.
b901: WMA
PTP: Sequence number mismatch 27 vs expected 28.
b902: OGG
ptp2/ptp_usb_getdata: read 1 bytes too much, expect problems!
PTP: Sequence number mismatch 28 vs expected 29.
b904: Audible.com Codec
ptp2/ptp_usb_getdata: read 1 bytes too much, expect problems!
PTP: Sequence number mismatch 29 vs expected 30.
b981: WMV
PTP: Sequence number mismatch 30 vs expected 31.
ba03: Abstract Audio Album
PTP: Sequence number mismatch 31 vs expected 32.
ba05: Abstract Audio Video Playlist
PTP: Sequence number mismatch 32 vs expected 33.
ba82: XMLDocument
PTP: Sequence number mismatch 33 vs expected 34.
Storage Devices:
StorageID: 0x00010001
StorageType: 0x0003
FilesystemType: 0x0002
AccessCapability: 0x0000
MaxCapacity: 8178892800
FreeSpaceInBytes: 4282351616
FreeSpaceInObjects: 4294967295
StorageDescription: iriver clix files
VolumeIdentifier: AA5504BABE4F3231313230310F0F0607
Special directories:
Default music folder: 0x00000000
Default playlist folder: 0x00000000
Default picture folder: 0x00000000
Default video folder: 0x00000000
Default organizer folder: 0x00000000
Default zencast folder: 0x00000000
Default album folder: 0x00000000
Default text folder: 0x00000000
MTP-specific device properties:
ptp2/ptp_usb_getdata: detected a broken PTP header, code field insane.
Friendly name: (NULL)
Synchronization partner: (NULL)
PTP: Sequence number mismatch 35 vs expected 37.
libmtp supported (playable) filetypes:
Text file
ISO MPEG-1 Audio Layer 3
Audio Video Interleave
Microsoft Advanced Systems Format
JPEG file
Microsoft Windows Media Audio
Ogg container format
Audible.com Audio Codec
Microsoft Windows Media Video
XML file
PTP: Sequence number mismatch 36 vs expected 38.
PTP: Sequence number mismatch 37 vs expected 39.
Unable to acquire device certificate, perhaps this device does not support
this
Error 2: PTP Layer error 02fc: get_device_unicode_property(): failed to get
unicode property.
Error 2: (Look this up in ptp.h for an explanation.)
ptp2/ptp_usb_getdata: detected a broken PTP header, code field insane.
WMPInfo.xml Does not exist on this device
PTP: Closing session
ERROR: Could not close session!
inep: usb_get_endpoint_status(): Connection timed out
outep: usb_get_endpoint_status(): Connection timed out
usb_clear_halt() on IN endpoint: Connection timed out
usb_clear_halt() on OUT endpoint: Connection timed out
usb_clear_halt() on INTERRUPT endpoint: Connection timed out
OK.

Also as root:
mtp-tracks
Attempting to connect device(s)
PTP: Opening session
PTP_ERROR_IO: Trying again after re-initializing USB interface
PTP: Opening session
LIBMTP PANIC: Could not open session! (Return code 765)
Try to reset the device.
LIBMTP PANIC: configure_usb_devices() error code: 7 on line 1561
mtp-folders: There has been an error connecting. Exit

The device seems ok. The last several sets of albums are now all lumped
under Unknown Artist/Unknown Album.

I have amarok configured to put the tracks in folders (Artist name/Album
name).

I had tried using gnomad2 and did not get this particular problem. I reset
the device and then tried using Amarok with the layout above.