Re: Blank DVD is not detected / cannot burn

[James Bottomley <James.Bottomley@suse.de>]

linux-scsi cc re-added, please don't drop ... others may know more than
me.

On Tue, 2010-09-14 at 13:35 +0100, Lee Jones wrote:
> On 14/09/10 13:18, James Bottomley wrote:
> > On Tue, 2010-09-14 at 12:27 +0100, Lee Jones wrote:
> >> A bug as been reported me to where some DVD-RW drives are unable to
> >> detect blank DVDs. Apparently this is a regression issue, as the
> >> reporting user is insisting that they used to be able to burn DVDs
> >> using the same hardware.
> >>
> >> The reporting user provided this dmesg output. I believe they tried a
> >> few different disks to gain this response.
> > 
> > You neglected to say what kernel?  I assume 2.6.35
> 
> The same results have been seen in 2.6.32 and 2.6.35.

OK, I'd still lay better odds on a burner program problem ... but since
it's so old, a bisection is likely needed.  Which kernel actually
worked?

James


> >> I am pasting dmesg output from these attempts:
> >> [ 3563.989601] sr 5:0:1:0: [sr0] Unhandled sense code
> >> [ 3563.989606] sr 5:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> >> [ 3563.989609] sr 5:0:1:0: [sr0] Sense Key : Medium Error [current]
> >> [ 3563.989614] sr 5:0:1:0: [sr0] ASC=0x10 <<vendor>> ASCQ=0x90
> >> [ 3563.989621] sr 5:0:1:0: [sr0] CDB: Read(10): 28 00 00 05 6f 60 00 00 02 00
> >> [ 3563.989629] end_request: I/O error, dev sr0, sector 1424768
> >> [ 3563.989633] quiet_error: 3 callbacks suppressed
> >> [ 3563.989636] Buffer I/O error on device sr0, logical block 178096
> >> [ 3607.084661] sr 5:0:1:0: [sr0] Device not ready
> >> [ 3607.084665] sr 5:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> >> [ 3607.084669] sr 5:0:1:0: [sr0] Sense Key : Not Ready [current]
> >> [ 3607.084673] sr 5:0:1:0: [sr0] Add. Sense: Medium not present
> >> [ 3607.084677] sr 5:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 1e 00 00 02 00
> >> [ 3607.084685] end_request: I/O error, dev sr0, sector 120
> >> [ 3607.084690] Buffer I/O error on device sr0, logical block 15
> >> [ 3607.090021] sr 5:0:1:0: [sr0] Device not ready
> >> [ 3607.090023] sr 5:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> >> [ 3607.090026] sr 5:0:1:0: [sr0] Sense Key : Not Ready [current]
> >> [ 3607.090029] sr 5:0:1:0: [sr0] Add. Sense: Medium not present
> >> [ 3607.090032] sr 5:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 1e 00 00 02 00
> >> [ 3607.090039] end_request: I/O error, dev sr0, sector 120
> > 
> > So these are all direct pass throughs.  That likely means the problem is
> > in the setup on the burner.  If there's some filesystem above this,
> > there was a Read/Write flag error in blk_rq_map_kern ... but that was
> > introduced in 2.6.36-rc1.
> > 
> > The only recent changes to sr were the BLK pushdown and they were post
> > 2.6.35.
> > 
> > James
> > 
> > 
>