Re: Card Asus P7131 hybrid > no signal
Hi, Mauro
Mauro Carvalho Chehab schrieb:
We have definitely issues on analog, but I can't test SECAM_L.
After ioctl2 conversion, the apps don't let the user select specific
subnorms like PAL_I, PAL_BG, PAL_DK and SECAM_L, SECAM_DK, SECAM_Lc
anymore.
Seems to be an issue at the userspace app. SAA7134_NORMS define a mask of supported
norms. STD_PAL covers all the above PAL_foo. Also, SECAM covers all the above
SECAM_foo.
If the userspace app sets V4L2_STD_PAL, the driver should run on autodetection
mode. If, otherwise, the app sets V4L2_STD_PAL_I, the driver will accept and
select PAL_I only.
Internally the driver knows about all norms, but we have a clear
breakage of application backward compatibility and might see various
side effects. Especially, but not only for SECAM, it was important that
the users can select the exact norm themselves because of audio carrier
detection issues.
It is not only Audio carrier selection:
SECAM-L is the only standard with positive modulation of the vision carrier.
The tuner needs to know this. So in the case of SECAM-L, we need the *exact*
standard.
The insmod option secam=l transfers the exact standard to the tuner.
By the way: I just noticed this: If saa713x does not identify the color system
(improperly forced), tvtime will say "no signal"
It is firstly on 2.6.25.
If you are affected, apps like xawtv or mplayer will only report these
TV standards.
It shouldn't be hard to make enum_std to send all possible supported formats.
Maybe this could be good for the apps you've mentioned.
In this case, a patch to videodev.c should replace the code after case
VIDIOC_ENUMSTD to another one that would report the individual standards, plus
the grouped ones.
Cheers,
Mauro
Best regards
Hartmut
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