[linux-dvb] mt352 readreg error avermedia 771

Paul Wheeler paulrwheeler at gmail.com
Thu Sep 15 22:24:39 CEST 2005


Sorry, for some reason it has now stopped working with knoppix and
2.6.11.12<http://2.6.11.12>.
Will try to find out more this weekend.

Paul

On 9/15/05, Paul Wheeler <paulrwheeler at gmail.com> wrote:
> 
> Ronnie, Miguel thanks for both of your quick replies.
> 
> Right I from my understanding of the problems I believe that a "race" is 
> going on as to when this card is detected. I think that it is most likely in 
> the i2c part of the driver (more justification below). So I have two 
> questions:
> 
> 1) Seeing as the card works in most cases do the driver writers have the 
> time and inclination to help find this bug? I am happy to put a lot of 
> effort into testing and narrowing down where the problem might lie however I 
> have done no kernel coding (but do know c++ well and am happy to play with 
> kernel source code but wont know what am doing with it). I dont want to put 
> all this effort in though for noone to use it.
> 
> 2) Is this the right list for the problem? It is a dvb card though I dont 
> know whether it is the mt352.c or the bttv-i2c.c files (maybe even some 
> more generic i2c code) AFAIK the mt352.c is 'maintained' on this list 
> whereas the bttv-i2c.c is on the v4l list. Is this correct?
> 
> 
> My reasons for thinking it is a race: My problem started when i changed 
> the power supply, thats it worked fine before changed the power supply and 
> stopped. I tried the card in another machine it worked so thought I must 
> have damaged the motherboard. So changed the motherboard and the same 
> problem. The card worked in one machine and not another even though both had 
> identical kernels. However I thought as a last attempt would try a knoppix 
> CD to see if that worked and it did so installed vanilla-2.6.11.12 kernel 
> and it worked again. So it consistently works with 2.6.11 and fails with 
> 2.6.13 on one machine but works with 2.6.13 on anaother. So the problem 
> can be sorted by both hardware and software changes (seemingly independent). 
> If it can be assumed that both of these cause and solve the same bug then 
> the bug must be in both hardware and software, the only way this could 
> happen is a "race" which is affected by hardware.
> 
> This fits with both Ronny and Miguel's experience. Ronny can seem to 
> affect the race by leaving his power supply plugged in.
> 
> Ronny, Miguel I would be interested to know if either of you have any 
> problems with the either the vanilla 2.6.11.12 <http://2.6.11.12> kernel 
> or the latest version of knoppix 3.9? If you dont then this race has been 
> introduced since then. I would also like to hear from anyone else who has 
> had this problem and if it is consistent/different from above.
> 
> Many thanks
> 
> Paul
> 
> P.S. bit more info. The problem only happens at boot, if it is detected 
> fine it works perfectly till next reboot, if not then wont work till 
> (possible) next reboot. I have had the card working then reboot the machine 
> without changing anything software wise and it stops working.
> 
> On 9/14/05, Miguel Yarza <yarza at euskalnet.net > wrote:
> > 
> > Paul Wheeler wrote:
> > 
> > >I have searched the list and the net to try and find a solution to this 
> > but 
> > >so far unsuccessfull. The problem is that the dvb frontend is not 
> > found. I
> > >have tried on a different motherboard and still same problem however a
> > >different computer it works fine.
> > >
> > >I get the following in dmesg 
> > >
> > >mt352_read_register: readreg error (reg=127, ret==-5)
> > >dvb-bt8xx: A frontend driver was not found for device 109e/0878
> > >subsystem 1461/0771
> > >
> > >In both machines I am using Gentoo-2.6.13-r1 kernel.
> > >
> > >The motherboards that it fails on are:
> > >
> > >asus p4p800s-x and an aopen intel 865 board
> > >
> > >it works fine in my shuttle sn41g2.
> > >
> > >I have tried all possible hardware fixes. 
> > >
> > >The card is recognized to begin with on the motherboard(asus) but after 
> > a
> > >reboot stops and hasnt worked since!!
> > >
> > >I have noticed others who have had this problem before but no solution 
> > is 
> > >posted. Could people possible post what motherboard they have if the 
> > card
> > >works or how they solved this problem if they had it before.
> > >
> > >Cheers
> > >
> > >Paul
> > >
> > >
> > Same problem here: 
> > - the card works great with Shuttle SN41G2 k7 nforce2 chipset
> > - but on a K7 ASUS A7N8X-E DELUXE (k7 nforce2 chipset too) "modprobe
> > dvb-bt8xx" says:
> > 
> > Sep 14 01:17:23 topocasa kernel: DVB: registering new adapter (bttv0). 
> > Sep 14 01:17:23 topocasa kernel: mt352_read_register: readreg error
> > (reg=127, ret==-5)
> > Sep 14 01:17:23 topocasa kernel: dvb-bt8xx: A frontend driver was not
> > found for device 109e/0878 subsystem 1461/0771
> > 
> > Same error with different kernels since 2.6.10 and snapshots from cvs,
> > last try with 2.6.12-6 from debian.
> > In the hardware front tried with different slots and card combinations,
> > no luck.
> > A difference with Paul's card behavior is that mine has never been 
> > recognized.
> > 
> > Cheers
> > 
> > Miguel
> > 
> > _______________________________________________
> > linux-dvb mailing list
> > linux-dvb at linuxtv.org
> > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> > 
> 
>
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