Comment 26 for bug 266951

I did some more testing today on the SH-S203P drive. I did both a BIOS upgrade, tried to to experiment with setting SATA to compatible mode in BIOS and disabling memory remapping. Also tried to boot with acpi=off noapic nolapic nohz=off pci=nomsi settings (and a combination of those), but it didn't help. If a cd is in the drive during boot, this error occurs once the "Uniform cd-rom driver Revision: 3.20" is loaded and then it has to timeout to go further.

If I try to mount a cd-rom, the error occurs at once:
Nov 10 17:53:14 pluto kernel: [ 909.054544] sr 4:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Nov 10 17:53:14 pluto kernel: [ 909.054550] sr 4:0:0:0: [sr0] Sense Key : Medium Error [current]
Nov 10 17:53:14 pluto kernel: [ 909.054553] sr 4:0:0:0: [sr0] Add. Sense: L-EC uncorrectable error
Nov 10 17:53:14 pluto kernel: [ 909.054556] end_request: I/O error, dev sr0, sector 1336808
Nov 10 17:53:14 pluto kernel: [ 909.054560] Buffer I/O error on device sr0, logical block 167101

Then it goes on for about a minute or so:
Nov 10 17:54:32 pluto kernel: [ 986.849538] Buffer I/O error on device sr0, logical block 167101
Nov 10 17:54:33 pluto kernel: [ 987.829874] ISO 9660 Extensions: Microsoft Joliet Level 3
Nov 10 17:54:33 pluto kernel: [ 987.915463] ISO 9660 Extensions: RRIP_1991A

But after that the drive settles, it's mounted and all the contents can be copied over at full speed with no problems at all. I have noticed that the errors also occur with factory printed cds, but also here the contents can be copied over at full speed once the drive settles:

Nov 10 18:07:39 pluto kernel: [ 1774.095301] end_request: I/O error, dev sr0, sector 1111296
Nov 10 18:07:39 pluto kernel: [ 1774.095308] Buffer I/O error on device sr0, logical block 138912
Nov 10 18:07:39 pluto kernel: [ 1774.097340] end_request: I/O error, dev sr0, sector 1111296
Nov 10 18:07:39 pluto kernel: [ 1774.097343] Buffer I/O error on device sr0, logical block 138912
Nov 10 18:07:39 pluto kernel: [ 1774.099899] end_request: I/O error, dev sr0, sector 1111528
Nov 10 18:07:39 pluto kernel: [ 1774.099902] Buffer I/O error on device sr0, logical block 138941
Nov 10 18:07:39 pluto kernel: [ 1774.101600] end_request: I/O error, dev sr0, sector 1111528
Nov 10 18:07:39 pluto kernel: [ 1774.101603] Buffer I/O error on device sr0, logical block 138941
Nov 10 18:07:39 pluto kernel: [ 1774.103282] end_request: I/O error, dev sr0, sector 1111536
Nov 10 18:07:39 pluto kernel: [ 1774.103285] Buffer I/O error on device sr0, logical block 138942
Nov 10 18:07:39 pluto kernel: [ 1774.104962] end_request: I/O error, dev sr0, sector 1111536

But if I insert a factory printed DVD, everything works with no errors at all! Tried with different DVDs. Yesterday I installed 8.10 server from a burnt mini iso, and although I had to wait with patience to wait for a timeout everytime the drive was accessed, the install completed.

If you want me to perform any more testing, just tell me. It would be nice to get this resolved.