[Debburn-devel] cdrkit-1.1.6: wodim gets DVD+R max. writing speed wrong

[Sebastian Kemper]

Hello list,

I'm trying to burn an iso to a Verbatim 16x DVD+R with wodim. wodim refuses to 
burn at speeds higher than 6x because it somehow gets the idea that's the 
limit of the media or the drive.

dvd+rw-mediainfo:

INQUIRY:                [Optiarc ][DVD RW AD-7170A ][1.04]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         1Bh, DVD+R
 Media ID:              MCC/004
 Current Write Speed:   6.1x1385=8467KB/s
 Write Speed #0:        6.1x1385=8467KB/s
 Write Speed #1:        5.1x1385=7056KB/s
 Write Speed #2:        4.1x1385=5645KB/s
 Write Speed #3:        3.1x1385=4234KB/s
 Write Speed #4:        2.0x1385=2822KB/s
 Write Speed #5:        1.0x1385=1411KB/s
GET [CURRENT] PERFORMANCE:
 Write Performance:     6.0x1385=8310KB/s@[0 -> 2295104]
 Speed Descriptor#0:    00/2295104 R at 16.0x1385=22160KB/s W at 18.0x1385=24930KB/s
 Speed Descriptor#1:    03/2295104 R at 16.0x1385=22160KB/s W at 16.0x1385=22160KB/s
 Speed Descriptor#2:    03/2295104 R at 12.0x1385=16620KB/s W at 12.0x1385=16620KB/s
 Speed Descriptor#3:    00/2295104 R at 8.0x1385=11080KB/s W at 8.0x1385=11080KB/s
 Speed Descriptor#4:    00/2295104 R at 8.0x1385=11080KB/s W at 6.0x1385=8310KB/s
 Speed Descriptor#5:    00/2295104 R at 5.0x1385=6925KB/s W at 4.0x1385=5540KB/s
 Speed Descriptor#6:    00/2295104 R at 5.0x1385=6925KB/s W at 2.4x1385=3324KB/s
READ DVD STRUCTURE[#0h]:
 Media Book Type:       00h, DVD-ROM book [revision 0]
 Legacy lead-out at:    2295104*2KB=4700372992
READ DISC INFORMATION:
 Disc status:           blank
 Number of Sessions:    1
 State of Last Session: empty
 "Next" Track:          1
 Number of Tracks:      1
READ TRACK INFORMATION[#1]:
 Track State:           blank
 Track Start Address:   0*2KB
 Next Writable Address: 0*2KB
 Free Blocks:           2295104*2KB
 Track Size:            2295104*2KB
 ROM Compatibility LBA: 0
READ CAPACITY:          0*2048=0

wodim -v -dao -speed=8 data.iso:

TOC Type: 1 = CD-ROM
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.6
SCSI buffer size: 64512
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'Optiarc '
Identification : 'DVD RW AD-7170A '
Revision       : '1.04'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x001B (DVD+R)
Profile: 0x002B (DVD+R/DL)
Profile: 0x001B (DVD+R) (current)
Profile: 0x001A (DVD+RW)
Profile: 0x0016 (DVD-R/DL layer jump recording)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0012 (DVD-RAM)
Profile: 0x0011 (DVD-R sequential recording)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW)
Profile: 0x0009 (CD-R)
Profile: 0x0008 (CD-ROM)
Profile: 0x0002 (Removable disk)
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags   : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
Drive buf size : 1015808 = 992 KB
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
FIFO size      : 33554432 = 32768 KB
Track 01: data  4477 MB
Total size:     5141 MB (509:23.02) = 2292227 sectors
Lout start:     5141 MB (509:25/02) = 2292227 sectors
Current Secsize: 2048
HINT: use dvd+rw-mediainfo from dvd+rw-tools for information extraction.
Blocks total: 2295104 Blocks current: 2295104 Blocks remaining: 2877
Speed set to 8467 KB/s
Starting to write CD/DVD at speed   6.0 in real SAO mode for single session.
Last chance to quit, starting real write i   3 seconds.
wodim: fifo had 511 puts and 0 gets.
wodim: fifo was 0 times empty and 1 times full, min fill was 0%.

The drive is connected as secondary master on the IDE bus (nforce2) in udma2 
mode. growisofs burns fine at 8x and 16x (didn't try 18x). I tried both 
kernel 2.6.21 and .22. This is a 32bit box.

Any idea what's wrong?

Regards
Sebastian