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SubjectPROBLEM: c2 error detection on CD-R broken with kernel 2.6.8 (since rc4)
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c2 error detection performed by readcd (cdrtools 2.01alpha28) seems to
be broken with vanilla kernel >= 2.6.8rc4 (didn't check with rc1, 2 and
3). This happens with both CDRW and CDROM on ATA (not the old scsi
emulation) on a VIA KT266A chipset with DMA enabled. CD-R/RW burning
seems to work flawlessy and I didn't get any error from a surface scan
on a different OS.
kernel config is the same I used to have, I just did a make oldconfig
and answered N to all new options.


this is the output I get with kernel 2.6.7:

$ readcd dev=/dev/hdd -c2scan
Read speed: 7056 kB/s (CD 40x, DVD 5x).
Write speed: 0 kB/s (CD 0x, DVD 0x).
Capacity: 356199 Blocks = 712398 kBytes = 695 MBytes = 729 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (1,1,0) disk to file '/dev/null'
end: 356199
addr: 356199 cnt: 39
Time total: 171.991sec
Read 920412.65 kB at 5351.5 kB/sec.
Total of 0 hard read errors.
C2 errors total: 0 bytes in 0 sectors on disk
C2 errors rate: 0.000000%
C2 errors on worst sector: 0, sectors with 100+ C2 errors: 0



and this is what I get with newer kernel (same cd, obviously):

$ readcd dev=/dev/hdd -c2scan
readcd: Success. read dvd structure: scsi sendcmd: no error
CDB: AD 00 00 00 00 00 00 00 00 20 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 0A 00 00 00 00 30 02 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x30 Qual 0x02 (cannot read medium - incompatible format)
Fru 0x0
Sense flags: Blk 0 (not valid)
resid: 32
cmd finished after 0.000s timeout 240s
readcd: Operation not permitted. set cd speed: scsi sendcmd: no error
CDB: BB 00 FF FF FF FF 00 00 00 00 00 00
status: 0x0 (GOOD STATUS)
cmd finished after 0.000s timeout 40s
Read speed: 7056 kB/s (CD 40x, DVD 5x).
Write speed: 0 kB/s (CD 0x, DVD 0x).
Capacity: 356199 Blocks = 712398 kBytes = 695 MBytes = 729 prMB
Sectorsize: 2048 Bytes
readcd: Operation not permitted. mode select g1: scsi sendcmd: no error
CDB: 55 10 00 00 00 00 00 00 14 00
status: 0x0 (GOOD STATUS)
cmd finished after 0.000s timeout 40s
Copy from SCSI (1,1,0) disk to file '/dev/null'
end: 356199
C2 in sector: 8 first at byte: 3 (0x14) total: 617 errors
C2 in sector: 11 first at byte: 7 (0x01) total: 1129 errors
C2 in sector: 12 first at byte: 2 (0x26) total: 1064 errors

[...]

C2 in sector: 356027 first at byte: 33 (0x66) total: 577 errors
C2 in sector: 356028 first at byte: 32 (0xAE) total: 559 errors
C2 in sector: 356029 first at byte: 33 (0x7A) total: 556 errors
C2 in sector: 356030 first at byte: 35 (0x18) total: 567 errors
C2 in sector: 356031 first at byte: 34 (0x22) total: 607 errors
addr: 356199 cnt: 18
Time total: 646.623sec
Read 920412.65 kB at 1423.4 kB/sec.
readcd: Operation not permitted. mode select g1: scsi sendcmd: no error
CDB: 55 10 00 00 00 00 00 00 14 00
status: 0x0 (GOOD STATUS)
cmd finished after 0.000s timeout 40s
Total of 0 hard read errors.
C2 errors total: 262256530 bytes in 225476 sectors on disk
C2 errors rate: 31.303833%
C2 errors on worst sector: 1960, sectors with 100+ C2 errors: 225440
readcd: Operation not permitted. mode select g1: scsi sendcmd: no error
CDB: 55 10 00 00 00 00 00 00 14 00
status: 0x0 (GOOD STATUS)
cmd finished after 0.000s timeout 40s


kernel messages:

VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt8233 (rev 00) IDE UDMA100 controller on pci0000:00:11.1
ide0: BM-DMA at 0xfc00-0xfc07, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xfc08-0xfc0f, BIOS settings: hdc:DMA, hdd:DMA
[...]
hdc: LITE-ON LTR-52327S, ATAPI CD/DVD-ROM drive
hdd: TOSHIBA DVD-ROM SD-M1612, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
[...]
hdc: ATAPI 52X CD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20
hdd: ATAPI 48X DVD-ROM drive, 512kB Cache, UDMA(33)


cdrecord output:

$ cdrecord dev=ATAPI -scanbus
Cdrecord-Clone 2.01a28 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg
Schilling
scsidev: 'ATAPI'
devname: 'ATAPI'
scsibus: -2 target: -2 lun: -2
Warning: Using ATA Packet interface.
Warning: The related libscg interface code is in pre alpha.
Warning: There may be fatal problems.
Using libscg version 'schily-0.8'.
scsibus0:
0,0,0 0) 'LITE-ON ' 'LTR-52327S ' 'QS0C' Removable
CD-ROM
0,1,0 1) 'TOSHIBA ' 'DVD-ROM SD-M1612' '1806' Removable
CD-ROM
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *




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