On Mon, 3 May 2004, Sergio Vergata wrote:
> very strange problem i builded the usb-storage module with Debug and test
> burnig a CD and a DVD both worked without problem, after that i build the
> module again without Debug an burned again at that point the burn stop and
> hang up the usb-Device.
> hmm so maybe i let the module compiled with Debug just for getting it to work
> but i don't think that should be like that.
>
>
>
> The USB-Storage output in proc...
>
> T: Bus=04 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 3 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=05e3 ProdID=0701 Rev= 0.02
> S: Manufacturer=Genesyslogic
Ha! I rather expected that.
People have experienced a lot of problems with Genesys interfaces. They
just don't work reliably at high speed. The problem seems to be related
to timing somehow, which could well explain why it works with debugging
turned on -- the debugging code might slow down the driver just enough.
Here's something else you should check. After plugging in your recorder
but before using it, look in the /sys directory. (I'm assuming you have
the sysfs filesystem mounted on /sys.) Find the file
/sys/class/scsi_host/host0/device/max_sectors and see what it contains.
It should contain just the number 128 -- if it has something larger (like
240) then you will need to do something like this:
echo 128 >/sys/class/scsi_host/host0/device/max_sectors
I think 2.6.6-rc3 will automatically store 128 in there for you. You
could even try reducing the number below 128; sometimes that helps.
Although to be honest, people who have tried that generally find their
writes still fail eventually, it just takes longer.
Alan Stern
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