I hope this is not a FAQ, but I haven't seen it anywhere.
I have done some more testing, and what I have found is this:
-Not all CDs hang. I have tried 3, and 2 of them hang, one doesn't. One
that hangs is a FreeBSD 4.2 CD. This CD works fine in all my other drives
under linux, and in all my drives in windows.
-If the CD hangs when I try to read it, I just have to reboot, and after
the reboot I get the "Type: <NULL> ANSI SCSI Revision: ffffffff"
problem. The operating system does not hang, only the CD and the
processes trying to use it.
-Powering off the PC/CD-RW does not solve the "Type: <NULL>..." problem
-Booting to windows and using the CD-RW (just reading) does not solve the
"Type: <NULL>..." problem, but the drive works fine in windows.
-Burning a CD in windows solves the "Type: <NULL>..." problem :)
It may be of little help that burning a cd in win fixes my drive, but I
mentioned it in case someone else gets the same problem and thinks their
drive is bust. I thought that for a while =) Now I only hope someone
knows how to fix this so I don't have to keep burning CDs to use the CDROM
under linux ;)
Ketil
On Mon, 26 Mar 2001, Ketil Froyn wrote:
> Hi.
>
> I posted earlier about a new vendor ID I though I had discovered, when
> what I had discovered (failed to discover at the time) was that the ID's
> in the complete list were listed without the "0x" in front :P That's why
> my searches for "0x7ab" never matched. And now that I have included the
> Freecom Freecom USB/IDE adaptor, things are happening.
>
> I have successfully mounted a CD in my usb cd-rw drive, and listing the
> directory contents works fine. I can list the files on the CD, but if I
> try to view the contents of a file ("less README.TXT"), the device hangs,
> and the "less" process hangs with state D (uninterruptible sleep (usually
> IO)).
>
> Also, sometimes (erm, ok, I just saw it for the first time ever, but this
> is all new to me) the drive shows up in /proc/scsi/scsi like this:
>
> Host: scsi1 Channel: 00 Id: 00 Lun: 00
> Vendor: Model: Rev:
> Type: <NULL> ANSI SCSI revision: ffffffff
>
> I did "rmmod usb-storage uhci" which worked ok, and then "modprobe usb",
> which promptly segfaulted. I tried again, no segfault this time, but uhci
> never finishes initialising. A reboot (power off) has not resolved the
> problem (ie. the entry has Type: <NULL> still).
>
> Linux localhost 2.4.2 #8 Mon Mar 26 21:28:27 CEST 2001 i686 unknown
> Kernel modules 2.4.2
> Gnu C egcs-2.91.66
> Gnu Make 3.78.1
> Binutils 2.9.5.0.22
> Linux C Library 2.1.3
> Dynamic linker ldd (GNU libc) 2.1.3
> Procps 2.0.6
> Mount 2.10f
> Net-tools 1.54
> Console-tools 0.3.3
> Sh-utils 2.0
> Modules Loaded usb-storage uhci ne 8390 nls_iso8859-1 vfat fat ufs
>
> /proc/bus/usb/devices:
>
> T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 5 Spd=12 MxCh= 2
> B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
> D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
> P: Vendor=0000 ProdID=0000 Rev= 0.00
> S: Product=USB UHCI-alt Root Hub
> S: SerialNumber=e000
> C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
> I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
> E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
> T: Bus=01 Lev=01 Prnt=05 Port=01 Cnt=01 Dev#= 6 Spd=12 MxCh= 0
> D: Ver= 1.00 Cls=ff(vend.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=07ab ProdID=fc01 Rev= 9.21
> C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 2mA
> I: If#= 0 Alt= 0 #EPs= 2 Cls=00(>ifc ) Sub=00 Prot=00 Driver=(none)
> E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
> E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl= 0ms
>
> I checked that the cd-rw had Driver=usb-storage when it worked. This entry
> was cut'n'pasted while I had Type: <NULL> in /proc/scsi/scsi
>
> Hope I didn't forget anything important this time. If there's anything
> else you need, don't hesitate to ask :)
>
> Ketil
>
>
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