I have reported similar behaviour in another Launchpad bug report. See: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/228624
and my report at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/228624/comments/48 I repeat some of that info here: hdparm -i /dev/scd1 gives ====== /dev/scd1: Model=PIONEER DVD-RW DVR-110 , FwRev=1.22 , SerialNo= Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic } RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=13395, BuffSize=64kB, MaxMultSect=0 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 udma3 udma4 AdvancedPM=no Drive conforms to: Unspecified: ATA/ATAPI-2,3,4,5 * signifies the current active mode ====== ps aux|grep addon-storage gives ====== root 5600 0.0 0.1 3420 1140 ? S Jul30 0:00 hald-addon-storage: no polling on /dev/fd0 because it is explicitly disabled root 5617 0.0 0.1 3420 1148 ? S Jul30 0:00 hald-addon-storage: polling /dev/sdc (every 2 sec) root 5620 0.0 0.1 3420 1156 ? S Jul30 0:00 hald-addon-storage: polling /dev/scd0 (every 2 sec) root 5623 0.0 0.1 3420 1160 ? S Jul30 0:00 hald-addon-storage: polling /dev/scd1 (every 2 sec) chandra 6799 0.0 0.0 3008 756 pts/1 R+ 00:42 0:00 grep addon-storage ====== and the tail of dmesg with a blank CD-R in the drive is: ====== [ 590.465267] sr1: CDROM not ready. Make sure there is a disc in the drive. [ 590.477516] sr1: CDROM not ready. Make sure there is a disc in the drive. [ 603.758796] sr1: CDROM not ready. Make sure there is a disc in the drive. [ 603.772636] sr1: CDROM not ready. Make sure there is a disc in the drive. [ 717.377875] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen [ 717.377892] ata2.01: cmd a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0 [ 717.377893] cdb 1b 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 [ 717.377895] res 40/00:03:00:08:00/00:00:00:00:00/a0 Emask 0x4 (timeout) [ 717.377898] ata2.01: status: { DRDY } [ 722.412225] ata2: port is slow to respond, please be patient (Status 0xd0) [ 727.390656] ata2: device not ready (errno=-16), forcing hardreset [ 727.390665] ata2: soft resetting link [ 732.580873] ata2: port is slow to respond, please be patient (Status 0x90) [ 737.395481] ata2: SRST failed (errno=-16) [ 737.395492] ata2: soft resetting link [ 738.044299] ata2.00: configured for UDMA/33 [ 738.207340] ata2.01: configured for UDMA/33 [ 738.207361] ata2: EH complete [ 1530.500330] sr1: CDROM not ready. Make sure there is a disc in the drive. [ 1530.512764] sr1: CDROM not ready. Make sure there is a disc in the drive. ====== Please note that a blank CD-R is in the drive in question. Can someone suggest some workaround please? I am happy to provide more diagnostic reports if told what to provide. Thanks. -- Fails to see blank CD/DVDs for writing https://bugs.launchpad.net/bugs/220957 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs