Re: em28xx: Kernel panic after installing latest linuxtv.org modules

[Mauro Carvalho Chehab <mchehab@redhat.com>]

Em Sun, 28 Apr 2013 20:29:19 +0200
Marcel Kulicke <marcel.kulicke@gmail.com> escreveu:

> Hi Mauro,
> 
> thanks a lot for taking the time to respond to my issue! 
> > Did it used to work with a previous version? If so, could you please
> > bisect to see what patch broke it?
> No, it also didn't work with the previous version, but since building
> the previous version was also a bit of a hassle, I am not so sure I got a clean module. 
> 
> > I'm not familiar enough with ARM to understand what the above actually means.
> > I would be expecting, instead, an error with the trace function stack.
> > 
> > Perhaps you need to enable some things at .config to enable it, or to run
> > ./scripts/ksymoops manually to translate the above into something useful.
> I only know the ksmoops way. Since I just read that you published a new version,
> I will try the new version and apply ksmoops there if necessary (hopefully not! :-)) 

Yes, let's hope it will work now.

> > 
> > I heard that using a 2A power adapter would work, but I don't have it
> > currently (I'm currently trying to get one). I tested also with an USB
> > hub with its own power supply. I found there two issues:
> > 
> > 	- the hub was sending power also to the Rpi, causing problems
> > there due to the other power adapter;
> > 
> > 	- the hub I used seemed to interfere at the USB isoc traffic.
> > 
> > What I'm trying to say is that perhaps this is not a driver issue at all,
> > but, instead, a problem with em28xx+demod high power consumption and Rpi.
> Sad to say, but I am using a 2A USB power adapter already. I also tried to it with a powered hub (yeah, that powered the pi as well - as you mentioned) but same oops-results. 

USB hubs can be a source of problems. The better is to not use it, if
the 2A USB power supply is enough.

> There is one other possibility. An RTL8192CU-WiFi-Module is also connected to the pi. Maybe it interferes? I will check that out as well. 

Perhaps. I would try without it as well.

> > The best way is to test the device first on a x86, to be sure that the
> > driver is OK there. Then, you need to properly address the power supply
> > needs for RPi. Only after that, check if are there at em28xx anything
> > that could be incompatible with arm.
> Will do!

Thanks!

-- 

Cheers,
Mauro