Bug#644747: Re: Re: Bug#644747: linux-image-3.0.0-2-amd64: udev doesn't create /dev/sr0, /dev/cdrom
After reading the Ubuntu bug report (#794642) I found that this Debian bug is also due to the SATA mode in my computer being set to IDE. When this is changed to AHCI the problem vanishes: /dev/cdrom appears.
On Sun, 09 Oct 2011 11:04:41 +0530 wrote
>On Sun, 2011-10-09 at 04:36 +0000, R S Chakravarti wrote:
> Thanks for responding.
> Hope you don't mind a personal reply this time
> (I don't know what I'm expected to do "officially"!).
You should keep cc'ing the bug address. I've forwarded your message
this time.
> I tried "modprobe sr_mod" but it didn't get loaded.
> I'm attaching the dmesg file you asked for.
[...]
OK, this shows:
[ 1.818602] ata2.00: ATAPI: HL-DT-ST DVDRAM GH22NS50, TN02, max UDMA/100
...
[ 1.834559] ata2.00: configured for UDMA/100
...
[ 6.833375] ata2.00: qc timeout (cmd 0xa0)
[ 6.833379] ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
[ 6.989430] ata2.01: NODEV after polling detection
[ 7.013410] ata2.00: configured for UDMA/100
[ 12.012184] ata2.00: qc timeout (cmd 0xa0)
[ 12.012187] ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
[ 12.012191] ata2.00: limiting speed to UDMA/100:PIO3
[ 12.168265] ata2.01: NODEV after polling detection
[ 12.192265] ata2.00: configured for UDMA/100
[ 17.191082] ata2.00: qc timeout (cmd 0xa0)
[ 17.191085] ata2.00: TEST_UNIT_READY failed (err_mask=0x4)
[ 17.191087] ata2.00: disabled
[ 17.191103] ata2: soft resetting link
[ 17.347162] ata2.01: NODEV after polling detection
[ 17.347184] ata2: EH complete
So the SATA driver is detecting the drive, but failing to communicate
with it beyond that.
It looks like this is the same problem as:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/794642
Please can you test the attached patch, following the directions at:
http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official
Ben.
--
Ben Hutchings
Reality is just a crutch for people who can't handle science fiction.
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