From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:22470 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753294Ab3D2Ool (ORCPT ); Mon, 29 Apr 2013 10:44:41 -0400 Date: Mon, 29 Apr 2013 11:44:36 -0300 From: Mauro Carvalho Chehab To: Marcel Kulicke Cc: linux-media@vger.kernel.org Subject: Re: em28xx: Kernel panic after installing latest linuxtv.org modules Message-ID: <20130429114436.71874115@redhat.com> In-Reply-To: <5A1B4C82-6E63-4E7F-A7E2-F3FA82669C70@gmail.com> References: <20130424081522.7d0fd37e@redhat.com> <5A1B4C82-6E63-4E7F-A7E2-F3FA82669C70@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Em Sun, 28 Apr 2013 20:29:19 +0200 Marcel Kulicke 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