Public bug reported:
I have a pci video capture adapter with 8 Conexant Fusion 878A inputs
using the bttv module. Every input is recognized as a different device
(/dev/video{0..7}). By default in previous ubuntu versions (worked with
11.04 and 11.10) the detection and creation of the devices had took much
time, 4 minutes in fact, but the problem could be resolved changing the
loading process of the i2c-algo-bit module adding a file in modprobe.d
with the content:
options i2c-algo-bit bit_test=1
This solution used to work in previous ubuntu versions and the 8 devices
were created in less than 1 second.
But with ubuntu (In fact lubuntu) 12.04 this procedure doesn't work
anymore. Even with the cited modification, the creation of the devices
takes a long time.
A pattern I realized is that a new device is created every 32 seconds as
seen in the dmesg log. I also added some modifications to make bttv
drive be more verbose and I am attaching the dmesg log (filtering only
bttv messages). Only the first device is created quickly.
Looking at the process just after boot I can see 8 executions of
modprobe -bv and one of them is using 100% of the cpu! (I'm attaching
the output of ps command).
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bt878 bttv v4l2 video4linux2
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https://bugs.launchpad.net/bugs/1003900
Title:
bttv module takes a long time (32 seconds) to create a new v4l device
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