[Bug 21948] tv-out does not work with TVStandard pal and rs690

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Dec 22 16:22:07 PST 2010


--- Comment #7 from Jack Kelly <jack-list at xlk.org.uk> 2010-12-22 16:22:06 PST ---
I believe I have the same problem

My system's specifications

    * ATI Radeon x1250 (RS690) (onboard motherboard)
    * radeon
    * AMD dual-core 64-bit processor, 2GB RAM
    * BioStar TA690G AM2 motherboard (with latest BIOS)
    * mythbuntu 10.10 64-bit

What I've tried:

*Windows Vista Media Centre 64-bit
S-Video and component output both work fine

*Ubuntu with AMD/ATI's latest closed-source driver
Component output shows a stable, colour image but no acceleration works and
video playback is very juddery. ATI's configuration software claims it can't
find a supported device. It turns out my x1250 is a "legacy device" so I
installed the "legacy" drivers but these were built for an old version of
Ubuntu and didn't install correctly.

*Ubuntu with the radeon (open source) driver
Works beautifully when outputting to a VGA monitor. But shows an unstable,
black-and-white image on my TV over S-video. I think the reason the image is
unstable is because the card isn't using the correct timings, although I have
no way to measure the S-video timings. I've tried both the "stock" radeon
driver (installed with Ubuntu 10.10) and the latest radeon driver from git.
I've tried:

$ xrandr --output S-video --set "tv standard" pal
$ xrandr --newmode "720x576 at 25i" 13.5 720 732 795 864 576 581 586 625 interlace
-hsync -vsync
$ xrandr --addmode S-video 720x576 at 25i
$ xrandr --output S-video --mode 720x576 at 25i

(I've tried all the PAL modelines listed on the MythTV wiki and I've tried
extracting a modeline from Windows using powerstrip).

Setting "tv standard" to pal actually makes the image totally unusable and
unusable (the image on the screen flickers and rolls rapidly across the screen,
moving right to left). pal-m is reasonably stable, as is ntsc.  Both pal-m and
ntsc show a black-and-white image which flickers every few seconds, as if the
TV is struggling to lock onto the image.  There is a definite difference
between pal and ntsc settings: with ntsc set, there are flickers of colour and
the image is slightly less stable than with pal-m

I've tried turning Kernel Mode Setting (KMS) off but that didn't help and
actually seemed to make X go very slowly

I've tried adding Kernel lines to configure the S-video output but no joy

I've tried all manor of xorg.conf settings but they seem to do very little

I've tried changing my BIOS's TV-Format settings to PAL and NTSC (and others)

Possibly of interest is this EDID bug (which I too am experiencing), but I
doubt it is relevant for my problem:

I've tried both the Ubuntu "stock" kernel 2.6.35 and today's (22nd Dec 2010)
release of 2.6.37.

One thing I have noticed is that I don't think my graphics hardware contains a
preset for PAL.  See the attached output of xrandr --props (please note that
the 4 modes of the form 7??x576@??? were entered by me; they are not defaults.

I've attached my dmesg log, Xorg.0.log and xorg.conf

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