This bug is fixed upstream in kernel 2.6.34-rc7. From the changelog:
commit 84a1d9c83e3e13991b958c897b6e9d6a5e4ce76d
Author: Michael Hunold
Date: Sat Mar 13 11:45:46 2010 -0300
V4L/DVB: saa7146: fix up bytesperline if it is an impossible value
xawtv using DGA on a Radeon graphics card provides bogus
values to S_FBUF, which will then screw up overlay video:
https://bugs.launchpad.net/ubuntu/+source/xawtv/+bug/499734
This fixes the bytesperline value if it is off completely.
Signed-off-by: Michael Hunold
Signed-off-by: Hans Verkuil
Signed-off-by: Mauro Carvalho Chehab
** Changed in: xawtv (Ubuntu)
Status: New => Fix Committed
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v4l-conf returns bogus values using DGA
https://bugs.launchpad.net/bugs/499734
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