[mythtv-users] Consistent flicker with ivtv-fb + PVR-350 decoding

[Stefán Hafliðason]

Hi all,

I'm using mythtv 0.19 with a PVR-350. Recently, I think since I upgraded
to 0.19, I have been getting a constant flickering when watching live tv
through the tuner or s-video inputs. The flickering might be better
described as a fairly regular flash of black.

I am also getting the following errors many times in /var/log/messages:

ivtv0 warning: prep_user_dma: SG_length 400 page_count 400 still full?
ivtv0-osd warning: ivtvfb_prep_dec_dma_to_device, Error with
get_user_pages: 1638400 bytes, 400 pages returned
ivtv0-osd warning: Error: prep osd dma to device rc=-5
ivtv0-osd warning: DMA xfer from b7318008 of 1638400 bytes failed with
(-5) offset = 0x0, total 1638400

I am currently running:

kernel 2.6.10-r9 (Gentoo),
PVR-350,
ivtv 0.4.2 - I have just tried 0.4.0, no difference

The flickering only occurs when using the PVR-350's decoder to watch
something on either input (currently static on the tuner (limited access
to aerial) and tv-out from another computer on the s-video input).
Watching a previous recording (with no flicker) works fine.

Thanks,

Stefan.