problems with several saa7134 cards

problems with several saa7134 cards

[Artem Bokhan]

  I use several (from three to five) saa7134-based cards on single PC. Currently 
I'm trying to migrate from 2.6.22 to 2.6.32 (ubuntu lts).

I've got problems which I did not have with 2.6.22 kernel:

1. Depending on configuration load average holds 1 or 2 when saa7134 module is 
loaded. The reason is kernel process "events/".

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    16 root      20   0     0    0    0 S    3  0.0   9:36.89 events/1
    15 root      20   0     0    0    0 D    3  0.0   9:35.81 events/0

2. Sound and video are not synced when recording with mencoder.


The same problem with 2.6.36 kernel except "events" process have different name 
(can't remember exact name, sorry)

Re: problems with several saa7134 cards

[Mauro Carvalho Chehab]

Em 13-12-2010 11:45, Artem Bokhan escreveu:
>  I use several (from three to five) saa7134-based cards on single PC. Currently I'm trying to migrate from 2.6.22 to 2.6.32 (ubuntu lts).
> 
> I've got problems which I did not have with 2.6.22 kernel:
> 
> 1. Depending on configuration load average holds 1 or 2 when saa7134 module is loaded. The reason is kernel process "events/".
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>    16 root      20   0     0    0    0 S    3  0.0   9:36.89 events/1
>    15 root      20   0     0    0    0 D    3  0.0   9:35.81 events/0

Probably, it is IR polling. You may disable IR via modprobe parameter:
$ modinfo saa7134|grep ir
parm:           disable_ir:disable infrared remote support (int)

Not sure if this parameter is on .32 kernel of if it were added on a newer one.

> 2. Sound and video are not synced when recording with mencoder.

I think that there are some parameters at mencoder to adjust the sync between video
and audio (-delay?). Basically, it needs to delay either audio or video, in order to sync.
The delay time is empiric, as the audio API doesn't provide any way to pass audio
timestamps, currently.
> 
> 
> The same problem with 2.6.36 kernel except "events" process have different name (can't remember exact name, sorry)
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