Re: Media autochanger driver changed behavior.

[Jesper Krogh <jesper@xxxxxxxx>]

James Bottomley wrote:
> On Thu, 2008-07-10 at 07:59 +0200, Jesper Krogh wrote:
> > James Bottomley wrote:
> > > On Wed, 2008-07-09 at 23:56 +0200, Jesper Krogh wrote:
> > > > James Bottomley wrote:
> > > > > On Wed, 2008-07-09 at 22:51 +0200, Jesper Krogh wrote:
> > > > > > Hi.
> > > > > >
> > > > > > Upgrading the OS from an quite old kernel to a newer (2.6.24) changed
> > > > > > the behavior of the "ch" driver. Now it does a inventory to the changer
> > > > > > on load. This command makes the barcode-reader scan the entire library
> > > > > > at driver load time.
> > > > > Do I take it from this that your old kernel simply didn't auto load the
> > > > > ch driver?  or that something has changed in the way the driver now
> > > > > works?
> > > > It sure did load the driver and it worked just fine. It just didnt make 
> > > > the library unit force scan the barcodes. (the library do that on bootup 
> > > > by itself, but it can be forced with mtx over the changer device).
> > > >
> > > > mtx -f /dev/changer inventory => Force scans barcodes
> > > > mtx -f /dev/changer status => Reads out the barcodes labels and slots
> > > > from the changer device without forcing the library to scan.
> > > > (note I dont know if it is library specific).
> > > OK, so it's not the autoloading code which I thought it might be.
> > >
> > > Which is the latest version of the kernel that works? ... that will at
> > > least give me the set of changes to look at.
> > I cant give you that, since I havent testet all, but I'm quite sure 
> > 2.6.20 worked,
> > completely sure that 2.6.15 was Ok.
> >
> > I know this is a large timespan, sorry.
>
> It would be enormously helpful if you could boot 2.6.20 and confirm.
> There are 3 changes to ch between 2.6.20 and 2.6.24.  There are 8
> between 2.6.15 and 2.6.24.

I'll get it done and report but, but we're a bit behind on the 
backup-schedules. So when the system has catched up I'll do some testing.

--
Jesper
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