Problem: 2.6.20-rc7 sata_via: SATA-DVD-Writer doesn't work properly

Hello,

I'm experiencing problems with an SATA-DVD-Writer (Samsung SH-S183a) connected
to a VIA8237 motherboard chipset. As you can see in the attached boot.log, the
system is reducing the DMA-Mode from DMA33 to DMA25 then to DMA16 to end up as
PIO4. As a result the dvds that are written are corrupt. During the writing
process the messages log shows repeating entries like this:

ata2.00: 2 bytes trailing data

Tried kernel: 2.6.18.2 (suse 10.2 default), 2.6.19.2 and 2.6.20-rc6.

The dvd writer is checked ok by using it on the same machine with an different
OS (WinXP).

Thanx in advance for any help!

Juergen Metzdorf

On Thu, 01 Feb 2007 19:22:31 +0100
juergen.metzdorf@telelev-dsl.de wrote:

Hello,

I'm experiencing problems with an SATA-DVD-Writer (Samsung SH-S183a) connected
to a VIA8237 motherboard chipset. As you can see in the attached boot.log, the
system is reducing the DMA-Mode from DMA33 to DMA25 then to DMA16 to end up as
PIO4. As a result the dvds that are written are corrupt. During the writing
process the messages log shows repeating entries like this:

Please try the patch I posted to the kernel list and ide list yesterday
which allows settle time on DMA changes.