Red Hat Bugzilla – Bug 123876
usb dvdrw gives cdrecord: Invalid argument. Cannot get SCSI I/O buffer.
Last modified: 2015-01-04 17:06:10 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040510 Galeon/1.3.14 Description of problem: I have a dvd burner attached via USB. I leave it off most of the time (it's noisy). When I turn it on, it shows up in /proc/scsi/scsi (and in /sys) with a scsi id of 0,0,0. Everything works perfectly if I use a 2.4 kernel, but when using a 2.6 kernel, `cdrecord -scanbus` (with or without -dev=ATA or -dev=ATAPI) doesn't see it. Instead, I get two "scsibus[12]" entries, one for my internal cd burner (seemingly at address 0,0,0) and one for my dvd reader (at 1,0,0). (those report as 1,0,0 and 2,0,0 when using -dev=ATAPI). I get "can't find" errors if I use -dev=sg or anything else. Trying to access the drive via /dev/scd0 results in an error about not using the dev-name (although it works fine for the IDE burner). The burner itself works fine under the 2.4.x kernel, and under 2.6 I can still eject/mount/etc. Just not burn my backup dvd's. Version-Release number of selected component (if applicable): cdrecord-2.01-0.a27.3 How reproducible: Always Steps to Reproduce: boot into 2.6 kernel turn on usb burner run `cdrecord -scanbus` Actual Results: sees internal IDE cdrw and DVD reader Expected Results: should see internal IDE cdrw DVD reader AND the external USB dvd burner. Additional info: I've scoured google for answers and have found plenty of people complaining about (and fixing) issues with nonworking burners, but nothing about cdrecord not even being able to SEE the burner.
In part this is a bug in the FC2 shipped kernel - it erroneously only makes /dev/sg accessible possible for devices which are not otherwise handled (disk, cd etc). This is a change that Linus has thrown out upstream and our kernel needs to fix in an errata
*** Bug 123481 has been marked as a duplicate of this bug. ***
can you paste the full error you get when you use /dev/scd0 ?
Created attachment 100461 [details] output from cdrecord -prcap for a variety of scenarios
ok. again for the record, dev=ATA and dev=ATAPI work fine. as does dev=/dev/hdc (my ide cd burner).. The requested responses felt a little big to paste here, so I've attached them.
cdrecord: Invalid argument. Cannot get SCSI I/O buffer. hmm that bug again ;(
Created attachment 100736 [details] cdrecord and system info Information from system with both ATA and SCSI peripherals.
Have similar problms on FC2 with SCSI CD-RW on Adaptec AHA-2940UW and ATA DVD-ROM. Details attached above. Also have a Firewire/USB DVD-RW at work that I can test with if desired. Please contact me if more info or testing is needed.
I'm no longer seeing this bug on 2.6.6-422, should this be closed or wait until cdrecord/cdparanoia are fixed to use SG_IO on SCSI and ATAPI devices?
I grabbed kernel-smp-2.6.6-1.422 from Arjan's apt repository, and the problem does seem to be gone (ie. I can burn a dvd with my usb burner)
Well, dvd burning does work, but that kernel is incredibly unstable. I've had complete system freezes (sorry, I don't know how to get at core files, etc to give more info) when burning to and reading from the usb burner. Problems go away when I go back to a 2.4 kernel.
Still unstable with kernel-2.6.6-1.435 (from Arjan's repository). I'd say that it kernel panics, but all I can tell is that X freezes and I have to hit the reset switch.
Fedora Core 2 has now reached end of life, and no further updates will be provided by Red Hat. The Fedora legacy project will be producing further kernel updates for security problems only. If this bug has not been fixed in the latest Fedora Core 2 update kernel, please try to reproduce it under Fedora Core 3, and reopen if necessary, changing the product version accordingly. Thank you.