>>>>> "JT" == Johannes Thumshirn <jthumshirn@xxxxxxx> writes: JT> Can you please apply this debugging patch, so I can see what's going JT> on. Sure, no problem. I generally run "mtx -f /dev/sg7 status" first just to make sure the library is there; this has always worked as expected. With the debug patch applied, this is sent to the console: [ 33.933422] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 56 [ 33.940526] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 136 [ 33.982429] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 [ 34.569986] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 [ 34.623898] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 Then running "mtx -f /dev/sg7 next 0" gives this as stdout/err: Unloading drive 0 into Storage Element 46...mtx: Request Sense: Long Report=yes mtx: Request Sense: Valid Residual=no mtx: Request Sense: Error Code=0 (Unknown?!) mtx: Request Sense: Sense Key=No Sense mtx: Request Sense: FileMark=no mtx: Request Sense: EOM=no mtx: Request Sense: ILI=no mtx: Request Sense: Additional Sense Code = 00 mtx: Request Sense: Additional Sense Qualifier = 00 mtx: Request Sense: BPV=no mtx: Request Sense: Error in CDB=no mtx: Request Sense: SKSV=no MOVE MEDIUM from Element Address 1 to 1046 Failed And this to the console: [ 45.552524] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 56 [ 45.559626] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 136 [ 45.603544] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 [ 46.204614] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 [ 46.258463] sg_is_valid_dxfer: dxfer_direction: -3, dxfer_len: 4240 [ 46.304530] sg_is_valid_dxfer: dxfer_direction: -2, dxfer_len: 0 Would you also want to see the output from that patch applied to a functioning kernel? - J<
