I've got a BU40N drive with original firmware A100 in it. IT is into an external enclosure with an ASM105X interface chip. IT is perfectly recognized in my Ubuntu 20.04 LTS laptop :
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Aug 3 17:35:14 kernel: [36400.872323] pktcdvd: pktcdvd0: writer unmapped
Aug 3 17:35:42 kernel: [36428.948408] usb 2-1: new SuperSpeed USB device number 3 using xhci_hcd
Aug 3 17:35:43 kernel: [36428.969291] usb 2-1: New USB device found, idVendor=174c, idProduct=55aa, bcdDevice= 1.00
Aug 3 17:35:43 kernel: [36428.969301] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
Aug 3 17:35:43 kernel: [36428.969304] usb 2-1: Product: ASM105X
Aug 3 17:35:43 kernel: [36428.969307] usb 2-1: Manufacturer: ASMT
Aug 3 17:35:43 kernel: [36428.969309] usb 2-1: SerialNumber: 2020082000000047
Aug 3 17:35:43 kernel: [36428.970411] usb-storage 2-1:1.0: USB Mass Storage device detected
Aug 3 17:35:43 kernel: [36428.970771] usb-storage 2-1:1.0: Quirks match for vid 174c pid 55aa: 400000
Aug 3 17:35:43 kernel: [36428.970830] scsi host1: usb-storage 2-1:1.0
Aug 3 17:34:48 rtkit-daemon[1450]: message repeated 9 times: [ Supervising 17 threads of 4 processes of 2 users.]
Aug 3 17:35:43 mtp-probe: checking bus 2, device 3: "/sys/devices/pci0000:00/0000:00:0d.0/usb2/2-1"
Aug 3 17:35:43 mtp-probe: bus: 2, device: 3 was not an MTP device
Aug 3 17:35:43 mtp-probe: checking bus 2, device 3: "/sys/devices/pci0000:00/0000:00:0d.0/usb2/2-1"
Aug 3 17:35:43 mtp-probe: bus: 2, device: 3 was not an MTP device
Aug 3 17:35:44 kernel: [36429.995652] scsi 1:0:0:0: CD-ROM HL-DT-ST BD-RE BU40N A100 PQ: 0 ANSI: 0
Aug 3 17:35:44 kernel: [36429.998613] sr 1:0:0:0: Power-on or device reset occurred
Aug 3 17:35:44 kernel: [36430.004321] sr 1:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
Aug 3 17:35:44 kernel: [36430.009213] sr 1:0:0:0: Attached scsi CD-ROM sr0
Aug 3 17:35:44 kernel: [36430.009284] sr 1:0:0:0: Attached scsi generic sg1 type 5
Aug 3 17:35:44 kernel: [36430.055188] pktcdvd: pktcdvd0: writer mapped to sr0
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Aug 3 17:42:16 kernel: [36822.602777] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:16 kernel: [36822.602785] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:16 kernel: [36822.602789] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:16 kernel: [36822.602792] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 02 00 00 00 02 00
Aug 3 17:42:16 kernel: [36822.602795] blk_update_request: I/O error, dev sr0, sector 2048 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
Aug 3 17:42:18 kernel: [36824.709153] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=2s
Aug 3 17:42:18 kernel: [36824.709160] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:18 kernel: [36824.709164] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:18 kernel: [36824.709168] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 02 00 00 00 02 00
Aug 3 17:42:18 kernel: [36824.709170] blk_update_request: I/O error, dev sr0, sector 2048 op 0x0:(READ) flags 0x0 phys_seg 2 prio class 0
Aug 3 17:42:18 kernel: [36824.709181] Buffer I/O error on dev sr0, logical block 512, async page read
Aug 3 17:42:18 kernel: [36824.709186] Buffer I/O error on dev sr0, logical block 513, async page read
Aug 3 17:42:21 kernel: [36827.793698] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:21 kernel: [36827.793707] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:21 kernel: [36827.793711] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:21 kernel: [36827.793715] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 3e d6 00 00 00 80 00
Aug 3 17:42:21 kernel: [36827.793717] blk_update_request: I/O error, dev sr0, sector 16472064 op 0x0:(READ) flags 0x80700 phys_seg 64 prio class 0
Aug 3 17:42:21 kernel: [36827.857926] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:21 kernel: [36827.857933] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:21 kernel: [36827.857937] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:21 kernel: [36827.857940] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 3e d6 00 00 00 01 00
Aug 3 17:42:21 kernel: [36827.857942] blk_update_request: I/O error, dev sr0, sector 16472064 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Aug 3 17:42:21 kernel: [36827.857952] Buffer I/O error on dev sr0, logical block 4118016, async page read
Aug 3 17:42:22 kernel: [36828.077319] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:22 kernel: [36828.077327] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:22 kernel: [36828.077331] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:22 kernel: [36828.077334] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 04 00 00 00 02 00
Aug 3 17:42:22 kernel: [36828.077336] blk_update_request: I/O error, dev sr0, sector 4096 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
Aug 3 17:42:22 kernel: [36828.142040] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:22 kernel: [36828.142047] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:22 kernel: [36828.142051] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:22 kernel: [36828.142054] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 04 00 00 00 01 00
Aug 3 17:42:22 kernel: [36828.142056] blk_update_request: I/O error, dev sr0, sector 4096 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Aug 3 17:42:22 kernel: [36828.142065] Buffer I/O error on dev sr0, logical block 1024, async page read
Aug 3 17:42:22 kernel: [36828.207585] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
Aug 3 17:42:22 kernel: [36828.207592] sr 1:0:0:0: [sr0] tag#0 Sense Key : Illegal Request [current]
Aug 3 17:42:22 kernel: [36828.207596] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Read of scrambled sector without authentication
Aug 3 17:42:22 kernel: [36828.207599] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 04 01 00 00 01 00
Aug 3 17:42:22 kernel: [36828.207601] blk_update_request: I/O error, dev sr0, sector 4100 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Aug 3 17:42:22 kernel: [36828.207610] Buffer I/O error on dev sr0, logical block 1025, async page read
Aug 3 17:42:22 kernel: [36828.416860] UDF-fs: INFO Mounting volume 'THE_PEACEMAKER', timestamp 1998/11/19 00:05 (1000)
Aug 3 17:42:22 dbus-daemon[1449]: [session uid=124 pid=1449] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.3' (uid=124 pid=1440 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
Aug 3 17:42:22 systemd[1424]: Starting Tracker metadata database store and lookup manager...
Aug 3 17:42:22 dbus-daemon[2000]: [session uid=1000 pid=2000] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.2' (uid=1000 pid=1996 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
Aug 3 17:42:22 systemd[1]: Created slice system-clean\x2dmount\x2dpoint.slice.
Aug 3 17:42:22 systemd[1]: Finished Clean the /media/georges/THE_PEACEMAKER mount point.
Aug 3 17:42:22 systemd[1988]: Starting Tracker metadata database store and lookup manager...
Aug 3 17:42:22 udisksd[1082]: Mounted /dev/sr0 at /media/georges/THE_PEACEMAKER on behalf of uid 1000
Aug 3 17:42:22 dbus-daemon[1449]: [session uid=124 pid=1449] Successfully activated service 'org.freedesktop.Tracker1'
Aug 3 17:42:22 systemd[1424]: Started Tracker metadata database store and lookup manager.
Aug 3 17:42:22 dbus-daemon[2000]: [session uid=1000 pid=2000] Successfully activated service 'org.freedesktop.Tracker1'
Aug 3 17:42:22 systemd[1988]: Started Tracker metadata database store and lookup manager.
Aug 3 17:42:52 tracker-store[62622]: OK
Aug 3 17:42:52 systemd[1988]: tracker-store.service: Succeeded.
Aug 3 17:42:52 tracker-store[62620]: OK
Aug 3 17:42:52 systemd[1424]: tracker-store.service: Succeeded.
If I remove this DVD and install another one (here "Apollo 13 Collector Edition" movie with Mr Hanks), I get a very different behaviour :
(Both DVD are Region 1 and my drive is seen as "region less" by MAkeMKV)
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ug 3 17:49:30 espineux kernel: [37256.399325] VFS: busy inodes on changed media sr0
Aug 3 17:49:30 espineux systemd[1]: Unmounting /media/georges/THE_PEACEMAKER...
Aug 3 17:49:30 espineux udisksd[1082]: Cleaning up mount point /media/georges/THE_PEACEMAKER (device 11:0 is not mounted)
Aug 3 17:49:30 espineux systemd[1424]: media-georges-THE_PEACEMAKER.mount: Succeeded.
Aug 3 17:49:30 espineux systemd[1]: media-georges-THE_PEACEMAKER.mount: Succeeded.
Aug 3 17:49:30 espineux systemd[1988]: media-georges-THE_PEACEMAKER.mount: Succeeded.
Aug 3 17:49:30 espineux systemd[1]: Unmounted /media/georges/THE_PEACEMAKER.
Aug 3 17:49:30 espineux dbus-daemon[2000]: [session uid=1000 pid=2000] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.2' (uid=1000 pid=1996 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
Aug 3 17:49:30 espineux systemd[1988]: Starting Tracker metadata database store and lookup manager...
Aug 3 17:49:30 espineux dbus-daemon[1449]: [session uid=124 pid=1449] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.3' (uid=124 pid=1440 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
Aug 3 17:49:30 espineux systemd[1]: Stopping Clean the /media/georges/THE_PEACEMAKER mount point...
Aug 3 17:49:30 espineux systemd[1424]: Starting Tracker metadata database store and lookup manager...
Aug 3 17:49:30 espineux systemd[1]: clean-mount-point@media-georges-THE_PEACEMAKER.service: Succeeded.
Aug 3 17:49:30 espineux systemd[1]: Stopped Clean the /media/georges/THE_PEACEMAKER mount point.
Aug 3 17:49:30 espineux dbus-daemon[2000]: [session uid=1000 pid=2000] Successfully activated service 'org.freedesktop.Tracker1'
Aug 3 17:49:30 espineux systemd[1988]: Started Tracker metadata database store and lookup manager.
Aug 3 17:49:30 espineux dbus-daemon[1449]: [session uid=124 pid=1449] Successfully activated service 'org.freedesktop.Tracker1'
Aug 3 17:49:30 espineux systemd[1424]: Started Tracker metadata database store and lookup manager.
Aug 3 17:49:32 espineux wpa_supplicant[1084]: wlp0s20f3: CTRL-EVENT-SIGNAL-CHANGE above=0 signal=-67 noise=9999 txrate=780000
Aug 3 17:49:41 espineux wpa_supplicant[1084]: wlp0s20f3: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-57 noise=9999 txrate=780000
Aug 3 17:49:49 espineux rtkit-daemon[1450]: Supervising 17 threads of 4 processes of 2 users.
Aug 3 17:49:51 espineux rtkit-daemon[1450]: message repeated 3 times: [ Supervising 17 threads of 4 processes of 2 users.]
Aug 3 17:50:00 espineux tracker-store[63223]: OK
Aug 3 17:50:00 espineux systemd[1988]: tracker-store.service: Succeeded.
Aug 3 17:50:00 espineux tracker-store[63226]: OK
Aug 3 17:50:00 espineux systemd[1424]: tracker-store.service: Succeeded.
Aug 3 17:51:02 kernel: [37348.957292] usb 2-1: reset SuperSpeed USB device number 3 using xhci_hcd
Aug 3 17:51:02 kernel: [37348.978587] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_TIME_OUT driverbyte=DRIVER_OK cmd_age=31s
Aug 3 17:51:02 kernel: [37348.978595] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 3f 40 80 00 00 80 00
Aug 3 17:51:02 kernel: [37348.978597] blk_update_request: I/O error, dev sr0, sector 16581120 op 0x0:(READ) flags 0x80700 phys_seg 64 prio class 0
Aug 3 17:51:25 systemd-udevd[500]: sr0: Worker [63345] processing SEQNUM=6616 is taking a long time
Aug 3 17:51:33 kernel: [37379.670590] usb 2-1: reset SuperSpeed USB device number 3 using xhci_hcd
Aug 3 17:53:25 systemd-udevd[500]: sr0: Worker [63345] processing SEQNUM=6616 killed
Aug 3 17:53:25 systemd-udevd[500]: Worker [63345] terminated by signal 9 (KILL)
Aug 3 17:53:25 systemd-udevd[500]: sr0: Worker [63345] failed
The dmesg ring buffer has a little more information :
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37348.957292] usb 2-1: reset SuperSpeed USB device number 3 using xhci_hcd
[37348.978587] sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_TIME_OUT driverbyte=DRIVER_OK cmd_age=31s
[37348.978595] sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 3f 40 80 00 00 80 00
[37348.978597] blk_update_request: I/O error, dev sr0, sector 16581120 op 0x0:(READ) flags 0x80700 phys_seg 64 prio class 0
[37379.670590] usb 2-1: reset SuperSpeed USB device number 3 using xhci_hcd
[37580.241784] INFO: task scsi_eh_1:61992 blocked for more than 120 seconds.
[37580.241794] Tainted: P O 5.15.0-43-generic #46~20.04.1-Ubuntu
[37580.241797] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[37580.241799] task:scsi_eh_1 state:D stack: 0 pid:61992 ppid: 2 flags:0x00004000
[37580.241806] Call Trace:
[37580.241808] <TASK>
[37580.241812] __schedule+0x2cd/0x890
[37580.241819] ? newidle_balance+0x12a/0x470
[37580.241825] schedule+0x4e/0xb0
[37580.241829] schedule_preempt_disabled+0xe/0x10
[37580.241832] __mutex_lock.isra.0+0x208/0x470
[37580.241837] ? bt_tags_iter+0x92/0xd0
[37580.241842] __mutex_lock_slowpath+0x13/0x20
[37580.241846] mutex_lock+0x32/0x40
[37580.241852] device_reset+0x22/0x50 [usb_storage]
[37580.241858] scsi_eh_ready_devs+0x57d/0xa70
[37580.241863] ? __pm_runtime_resume+0x60/0x80
[37580.241867] scsi_error_handler+0x437/0x520
[37580.241872] ? scsi_eh_get_sense+0x250/0x250
[37580.241876] kthread+0x127/0x150
[37580.241880] ? set_kthread_struct+0x40/0x40
[37580.241883] ret_from_fork+0x1f/0x30
[37580.241890] </TASK>
[37580.241891] INFO: task usb-storage:61994 blocked for more than 120 seconds.
[37580.241895] Tainted: P O 5.15.0-43-generic #46~20.04.1-Ubuntu
[37580.241897] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[37580.241899] task:usb-storage state:D stack: 0 pid:61994 ppid: 2 flags:0x00004000
[37580.241903] Call Trace:
[37580.241904] <TASK>
[37580.241906] __schedule+0x2cd/0x890
[37580.241909] ? usleep_range_state+0x90/0x90
[37580.241914] schedule+0x4e/0xb0
[37580.241917] schedule_timeout+0x202/0x2c0
[37580.241922] ? usleep_range_state+0x90/0x90
[37580.241925] __wait_for_common+0xb0/0x160
[37580.241929] wait_for_completion+0x24/0x30
[37580.241933] usb_sg_wait+0xea/0x170
[37580.241938] usb_stor_bulk_transfer_sglist+0x97/0xe0 [usb_storage]
[37580.241945] usb_stor_bulk_srb+0x3d/0x70 [usb_storage]
[37580.241951] usb_stor_Bulk_transport+0x177/0x410 [usb_storage]
[37580.241956] ? schedule_timeout+0x202/0x2c0
[37580.241960] usb_stor_invoke_transport+0x3b/0x520 [usb_storage]
[37580.241967] ? usleep_range_state+0x90/0x90
[37580.241970] ? __wait_for_common+0xf7/0x160
[37580.241974] usb_stor_transparent_scsi_command+0xe/0x10 [usb_storage]
[37580.241980] usb_stor_control_thread+0x198/0x290 [usb_storage]
[37580.241986] ? storage_probe+0x2b0/0x2b0 [usb_storage]
[37580.241992] kthread+0x127/0x150
[37580.241995] ? set_kthread_struct+0x40/0x40
[37580.241998] ret_from_fork+0x1f/0x30
[37580.242004] </TASK>
[37701.077594] INFO: task udisksd:1082 blocked for more than 120 seconds.
[37701.077605] Tainted: P O 5.15.0-43-generic #46~20.04.1-Ubuntu
[37701.077609] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[37701.077610] task:udisksd state:D stack: 0 pid: 1082 ppid: 1 flags:0x00000000
[37701.077618] Call Trace:
[37701.077621] <TASK>
[37701.077625] __schedule+0x2cd/0x890
[37701.077634] ? enqueue_entity+0x10f/0x6f0
[37701.077640] ? usleep_range_state+0x90/0x90
[37701.077645] schedule+0x4e/0xb0
[37701.077649] schedule_timeout+0x202/0x2c0
[37701.077654] ? ttwu_do_wakeup+0x1c/0x170
[37701.077659] ? ttwu_do_activate+0x9f/0x570
[37701.077663] ? usleep_range_state+0x90/0x90
[37701.077668] __wait_for_common+0xb0/0x160
[37701.077672] wait_for_completion+0x24/0x30
[37701.077677] __flush_work+0x153/0x240
[37701.077682] ? worker_detach_from_pool+0xc0/0xc0
[37701.077687] __cancel_work_timer+0x12c/0x1b0
[37701.077692] ? find_inode_fast.isra.0+0x59/0xc0
[37701.077698] cancel_delayed_work_sync+0x13/0x20
[37701.077703] disk_block_events+0x78/0x80
[37701.077709] blkdev_get_by_dev+0x111/0x2d0
[37701.077714] ? blkdev_close+0x30/0x30
[37701.077719] blkdev_open+0x50/0x90
[37701.077723] do_dentry_open+0x157/0x380
[37701.077728] vfs_open+0x2d/0x30
[37701.077734] path_openat+0xb48/0x1150
[37701.077740] do_filp_open+0xb2/0x120
[37701.077745] ? __check_object_size+0x13f/0x150
[37701.077750] do_sys_openat2+0x245/0x320
[37701.077755] do_sys_open+0x46/0x80
[37701.077760] __x64_sys_openat+0x20/0x30
[37701.077765] do_syscall_64+0x59/0xc0
[37701.077770] ? syscall_exit_to_user_mode+0x27/0x50
[37701.077775] ? __x64_sys_newfstat+0x16/0x20
[37701.077780] ? do_syscall_64+0x69/0xc0
[37701.077783] ? irqentry_exit+0x19/0x30
[37701.077788] ? exc_page_fault+0x89/0x160
[37701.077793] ? asm_exc_page_fault+0x8/0x30
[37701.077796] entry_SYSCALL_64_after_hwframe+0x44/0xae
[37701.077802] RIP: 0033:0x7f78d2618b34
[37701.077807] RSP: 002b:00007ffc3f099ee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
[37701.077812] RAX: ffffffffffffffda RBX: 00007ffc3f09a00c RCX: 00007f78d2618b34
[37701.077815] RDX: 0000000000000000 RSI: 000055fdea8a8a70 RDI: 00000000ffffff9c
[37701.077817] RBP: 000055fdea8a8a70 R08: 0000000000000000 R09: 000000000000000b
[37701.077820] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
[37701.077822] R13: 0000000000000000 R14: 000055fdea8a8a70 R15: 000055fdea919ce0
[37701.077826] </TASK>
[37701.078094] INFO: task scsi_eh_1:61992 blocked for more than 241 seconds.
[37701.078098] Tainted: P O 5.15.0-43-generic #46~20.04.1-Ubuntu
[37701.078101] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[37701.078102] task:scsi_eh_1 state:D stack: 0 pid:61992 ppid: 2 flags:0x00004000
[37701.078107] Call Trace:
[37701.078109] <TASK>
[37701.078111] __schedule+0x2cd/0x890
[37701.078115] ? newidle_balance+0x12a/0x470
[37701.078120] schedule+0x4e/0xb0
[37701.078124] schedule_preempt_disabled+0xe/0x10
[37701.078129] __mutex_lock.isra.0+0x208/0x470
[37701.078133] ? bt_tags_iter+0x92/0xd0
[37701.078139] __mutex_lock_slowpath+0x13/0x20
[37701.078143] mutex_lock+0x32/0x40
[37701.078150] device_reset+0x22/0x50 [usb_storage]
[37701.078157] scsi_eh_ready_devs+0x57d/0xa70
[37701.078164] ? __pm_runtime_resume+0x60/0x80
[37701.078168] scsi_error_handler+0x437/0x520
[37701.078173] ? scsi_eh_get_sense+0x250/0x250
[37701.078178] kthread+0x127/0x150
[37701.078182] ? set_kthread_struct+0x40/0x40
[37701.078187] ret_from_fork+0x1f/0x30
[37701.078194] </TASK>
[37701.078196] INFO: task usb-storage:61994 blocked for more than 241 seconds.
[37701.078199] Tainted: P O 5.15.0-43-generic #46~20.04.1-Ubuntu
[37701.078202] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[37701.078203] task:usb-storage state:D stack: 0 pid:61994 ppid: 2 flags:0x00004000
[37701.078207] Call Trace:
[37701.078208] <TASK>
[37701.078210] __schedule+0x2cd/0x890
[37701.078214] ? usleep_range_state+0x90/0x90
[37701.078219] schedule+0x4e/0xb0
[37701.078223] schedule_timeout+0x202/0x2c0
[37701.078228] ? usleep_range_state+0x90/0x90
[37701.078233] __wait_for_common+0xb0/0x160
[37701.078237] wait_for_completion+0x24/0x30
[37701.078241] usb_sg_wait+0xea/0x170
[37701.078248] usb_stor_bulk_transfer_sglist+0x97/0xe0 [usb_storage]
[37701.078255] usb_stor_bulk_srb+0x3d/0x70 [usb_storage]
[37701.078262] usb_stor_Bulk_transport+0x177/0x410 [usb_storage]
[37701.078268] ? schedule_timeout+0x202/0x2c0
[37701.078273] usb_stor_invoke_transport+0x3b/0x520 [usb_storage]
[37701.078280] ? usleep_range_state+0x90/0x90
[37701.078285] ? __wait_for_common+0xf7/0x160
[37701.078290] usb_stor_transparent_scsi_command+0xe/0x10 [usb_storage]
[37701.078296] usb_stor_control_thread+0x198/0x290 [usb_storage]
[37701.078303] ? storage_probe+0x2b0/0x2b0 [usb_storage]
[37701.078310] kthread+0x127/0x150
[37701.078314] ? set_kthread_struct+0x40/0x40
[37701.078317] ret_from_fork+0x1f/0x30
[37701.078323] </TASK>
It seems not to be the BU40N hardware at fault because it can read/write CD, DVD single and dual layers and BD dics.
It is not the software because on this same laptop, the Apollo 13 DVD reads fine in another drive...
So I'm very very annoyed by this and would like to know what to do, or look for ?
Could it be a bug in the firmware ?
Please help me.
Many thanks in advance for your help.