Can't print with PSC 2410

The printer is correctly seen by ptal-XXX.
If I try to print nothing happens, but if remove the usblp kernel module 
printing starts but hangs almost immediately.

ptal-init-setup :

  Found "psc 2400 series"
     with serial number "MY47MM22XH6T".
     This device is already set up as "mlc:usb:psc_2400_series".


in syslog :
ptal-mlcd: SYSLOG at ExMgr.cpp:652, dev=<mlc:usb:psc_2400_series>, 
pid=30441, e=2, t=1112217458         ptal-mlcd successfully initialized.
ptal-printd: ptal-printd(mlc:usb:psc_2400_series) successfully 
initialized using /var/run/ptal-printd/mlc_usb_psc_2400_series*.
ptal-photod: ptal-photod(mlc:usb:psc_2400_series) successfully 
initialized, listening on port 5703.

If I try to print :
ptal-mlcd: ERROR at ExMgr.cpp:2525, dev=<mlc:usb:psc_2400_series>, 
pid=7423, e=16, t=1112160630         Couldn't find device!

If I remove usblp :
ptal-mlcd: SYSLOG at 
/var/lib/mythtv/mnt/home/msp/src/debian/hpoj/hpoj-0.91/mlcd/ExMgr.h:646, 
dev=<mlc:usb:psc_2400_series@%001%002>, pid=7423, e=11, t=1112214650 
      ptal-mlcd successfully activated, mode=1284.4.
ptal-mlcd: ERROR at ExMgr.cpp:3165, 
dev=<mlc:usb:psc_2400_series@%001%002>, pid=27300, e=11, t=1112214655 
       llioSubprocess: llioWrite returns -110, expected=63!


Additional info :
ptal-connect mlc:usb:psc_2400_series -service PTAL-MLCD-DUMP
ptal-connect: connecting to device "mlc:usb:psc_2400_series"...  successful.

ExMgr:
pid=30441
gDebugFlag=0
pBufferPool: available#=0, size=4102, requested#=390, allocated#=1
noFork=0
noDrain=0
forceMlcDot4=0
noDot4=0
noMlc=0
noPmlMultiplexing=0
initialized=1
fd=5: read=1, write=0
fd=8: read=1, write=0
fdCount=9
exContext=2
exState=0
exActivateCount=0
exCloseCount=0
exCloseReason=0x0000
tryDot4=0
tryMlc=0
transportMode=0=print-only
miser=0
argcOriginal=8
argvOriginal:  "mlc:usb:psc_2400_series" "-devidmatch" "MDL:psc 2400 
series;" "-devidmatch" "SN:MY47MM22XH6T;" "-device" "/dev/usb/lp[0-9]*" 
"/dev/usblp[0-9]*"
argc=0
fdNull=4
pFreeMsgPool: depth=0
pPendingMsgQueue: depth=0
pActiveTimerQueue: depth=0
pPeriodicTimerQueue: depth=0
select timeout: sec=0, usec=0, infinite=1
consoleAllowRemote=0
consoleOldStdin=6
consoleOldStdout=7
consoleIsRemote=0
socketSuffix=<usb:psc_2400_series>
socketName=</var/run/ptal-mlcd/usb:psc_2400_series>
socketFd=5
pmlTransportSession=8
pmlCurrentSession=-1
pmlLastSession=31
llioPossibleName[0]=</dev/usb/lp[0-9]*>
llioPossibleName[1]=</dev/usblp[0-9]*>
llioPossibleNameCount=2
llioName=<>
llioGlobBuffer.gl_pathc=0
llioGlobBuffer.gl_offs=0
llioGlobFlags=0
llioMatchDeviceID[0]=<MDL:psc 2400 series;>
llioMatchDeviceID[1]=<SN:MY47MM22XH6T;>
llioMatchDeviceIDCount=2
llioInterface[EX_INTERFACE_MLC].pForwardBdrQueue: depth=0
llioInterface[EX_INTERFACE_MLC].active=0
llioInterface[EX_INTERFACE_MLC].transportState=0
llioInterface[EX_INTERFACE_MLC].fdPipe.read=-1
llioInterface[EX_INTERFACE_MLC].fdPipe.write=-1
llioInterface[EX_INTERFACE_MLC].fdDevice=-1
llioInterface[EX_INTERFACE_MLC].overrideMaxForwardPacketSize=0
llioInterface[EX_INTERFACE_MLC].pid=-1
llioInterface[EX_INTERFACE_PRINT].pForwardBdrQueue: depth=0
llioInterface[EX_INTERFACE_PRINT].active=0
llioInterface[EX_INTERFACE_PRINT].transportState=0
llioInterface[EX_INTERFACE_PRINT].fdPipe.read=-1
llioInterface[EX_INTERFACE_PRINT].fdPipe.write=-1
llioInterface[EX_INTERFACE_PRINT].fdDevice=-1
llioInterface[EX_INTERFACE_PRINT].overrideMaxForwardPacketSize=0
llioInterface[EX_INTERFACE_PRINT].pid=-1
llioEnablePrintInterface=1
llioDeviceID=<>
llioSavedDeviceID=<>
llioMatchVendorID=0xFFFFFFFF
llioMatchProductID=0xFFFFFFFF
llioAllowComposite=1
llioGlobUsb=1
llioAllowChannelChangeRequest=1
llioBusAddress=0
llioDeviceAddress=0
llioVendorID=0x0000
llioProductID=0x0000
llioSupportedProtocols=0x00
llioCurrentProtocol=0
llioDesiredProtocol=0

Passthrough transport:
this=0x00000000080762F0
port=0
pMgr=0x0000000008073008
pPhysicalPort=0x0000000008073008
forwardTransactionCounter: current=128, initial=128, low=128, high=128, 
max=128
channelCount=1
channelArray=0x00000000080763D0
channelArray[0]=0x00000000080763E0
overheadBufferCount=0
pNextTransport=0x0000000000000000
pForwardDataTimer=0x0000000008076390 (count=0)
pForwardDataTimeoutMsg=0x0000000008076360
reverseDataBufferCount=0
reverseDataBufferSize=0
maxForwardBdrsPerTransaction=0
nextChannelToAllocate=0
absoluteMaxForwardDatalen=0
absoluteMaxReverseDatalen=0
nextBlockedChannel=-1
lookupQueue: depth=0, peek=0x0000000000000000

MLC/1284.4 transport:
this=0x0000000008073DB0
port=0
pMgr=0x0000000008073008
pPhysicalPort=0x0000000008073008
forwardTransactionCounter: current=128, initial=128, low=128, high=128, 
max=128
channelCount=17
channelArray=0x0000000008073FA8
channelArray[0]=0x0000000008073FF0
channelArray[1]=0x00000000080742F0
channelArray[2]=0x00000000080744F0
channelArray[3]=0x00000000080746F0
channelArray[4]=0x00000000080748F0
channelArray[5]=0x0000000008074AF0
channelArray[6]=0x0000000008074CF0
channelArray[7]=0x0000000008074EF0
channelArray[8]=0x00000000080750F0
channelArray[9]=0x00000000080752F0
channelArray[10]=0x00000000080754F0
channelArray[11]=0x00000000080756F0
channelArray[12]=0x00000000080758F0
channelArray[13]=0x0000000008075AF0
channelArray[14]=0x0000000008075CF0
channelArray[15]=0x0000000008075EF0
channelArray[16]=0x00000000080760F0
overheadBufferCount=0
pNextTransport=0x00000000080762F0
pForwardDataTimer=0x0000000008073E80 (count=0)
pForwardDataTimeoutMsg=0x0000000008073E50
reverseDataBufferCount=0
reverseDataBufferSize=0
maxForwardBdrsPerTransaction=0
nextChannelToAllocate=0
absoluteMaxForwardDatalen=0
absoluteMaxReverseDatalen=0
nextBlockedChannel=-1
lookupQueue: depth=0, peek=0x0000000000000000
----------------
pForwardHeaderPool=0x0000000008073EC0
mlcChannelArray=0x0000000008073FA8
pCommandChannel=0x0000000008073FF0
grcState=0
reverseDataStopped=0
tryDot4=0
tryPreDot4=0
tryMlc=0
requestedRevision=0xFFFF
revision=0xFFFF
maxRemoteSockets=32

Command channel:
this=0x0000000008073FF0
port=0
channel=0
localSocket=0
pTransport=0x0000000008073DB0
pMgr=0x0000000008073008
pPhysicalPort=0x0000000008073008
openingAnySetFlags=0x0010
closingAnySetFlags=0x0124
flags=0x0000
countOpen=0
countOpenFailure=0
pService=0x0000000000000000
scd=0x0000000000000000
forwardDataPriority=0
minBuffersRequired=0
benefitOfMoreBuffers=0
reverseDataBufferSize=0
bufferCount=3
remoteSocket=0
maxForwardDatalen=0
maxReverseDatalen=0
countForwardData=0
countReverseData=0
countReverseBuffers=0
countReverseBufferReturns=0
lastReverseBuffer=0x0000000000000000
currentForwardBuffer=0x0000000000000000
currentGrabbedCredit=-1
currentGrabbedTransaction=-1
----------------
pMlcTransport=0x0000000008073DB0
pCommandChannel=0x0000000008073FF0
disableCreditCommands=1
pForwardCreditRequestTimer=0x08074190
pForwardCreditRequestMsg=0x0000000008074160
pReverseCreditHeartbeatTimer=0x00000000080741F8
pReverseCreditHeartbeatMsg=0x080741C8
musherFirstCreditRequestDelay=2
musherNextCreditRequestDelay=5
gusherFirstCreditRequestDelay=5
gusherNextCreditRequestDelay=10
miserFirstCreditRequestDelay=0
miserNextCreditRequestDelay=2
gusherPiggybackCreditCount=1
gusherCreditCount=2
miserCreditRequestCount=2
workaroundReverseCreditLoss=0
maxForwardPacketSize=64
maxReversePacketSize=64
forwardCreditRequest=16
forwardMaxOutstandingCredit=1
forwardCredit: current=0, initial=0, low=0, high=0, max=65535
lastCreditRequestGotUsNowhere=0
reverseMaxOutstandingCredit=1
reverseBuffersPerPacket=0
uncreditedBuffers=3
reverseCreditToGrant=0
reverseCredit: current=0, initial=0, low=0, high=0, max=65535
countSendPiggybackCredit=0
countHandlePiggybackCredit=0
countSendCredit=0
countHandleCredit=0
countHandleCreditAfterCreditRequest=0
countSendCreditRequest=0
countHandleCreditRequest=0
countSendEmptyCreditRequestReply=0
countHandleEmptyCreditRequestReply=0
isGusher=-1
----------------
pForwardCommandPool=0x0000000008074230
pForwardNonconsumingQueue=0x0000000008074250
pForwardReplyQueue=0x0000000008074260
pForwardRequestQueue=0x0000000008074270
forwardRequestCredit: current=0, initial=0, low=0, high=0, max=65535
pCommandReplyTimer=0x00000000080742B0 (count=0)
pCommandReplyTimeoutMsg=0x0000000008074280
allowErrorPackets=1
lastRequest=0xFFFFFFFF
lastPsid=-1
lastSsid=-1

Session 0: type=command
         state=1
         fd=8
         scdlink=-1
         pLookup=0x0000000008073888
         outstandingForwardBdrCount=1
         pReverseBdrQueue: depth=0
         tcd=0x0000000000000000
         pCommandBdr=0x00000000080786A0
         pmlTrapsRegistered=0
         bitbucketSocket=0



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