Re: [Hampshire] Choppy DVD playback on Edgy

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Author: Tony Whitmore
Date:  
To: Hampshire LUG Discussion List
Subject: Re: [Hampshire] Choppy DVD playback on Edgy

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Peter Brooks wrote:
> Hello all,
> I'm trying to play a dvd on edgy eft but whenever the dvd is being
> actively read, the video goes extremely choppy.
> I get this from hdparm:
>
> theneb@neb-laptop:~$ sudo hdparm /dev/dvd
>
> /dev/dvd:
>  IO_support   =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  HDIO_GETGEO failed: Inappropriate ioctl for device


Well, DMA is enabled. Having DMA off is the usual cause of choppy DVD
playback.

> And a bunch of errors in dmesg:
> [17181534.764000] hdc: command error: error=0x50 { LastFailedSense=0x05 }
> [17181534.764000] ide: failed opcode was: unknown
> [17181534.764000] end_request: I/O error, dev hdc, sector 14888932
> [17181534.768000] hdc: command error: status=0x51 { DriveReady
> SeekComplete Error }


Just as with a hard disk, this sort of error implies a dodgy disk. I'd
suggest cleaning the disk with any cleaning kit you might have. (A damp
tissue will do if you don't have a cleaning kit.) This should remove any
surface dust or sticky fingerprints. Then check the disk for major
scratches or abrasions to the surface. If there are large scratches etc.
then it might be time to buy a new disk.

HTH,

Tony