[linux-dvb] Nova-T 500 issues - losing one tuner

Patrik Hansson patrik at wintergatan.com
Wed Feb 27 20:38:53 CET 2008


On Tue, Feb 26, 2008 at 8:37 PM, Patrik Hansson <patrik at wintergatan.com> wrote:
>
> On Tue, Feb 26, 2008 at 8:18 PM, Philip Pemberton <lists at philpem.me.uk> wrote:
>  > Patrik Hansson wrote:
>  >  > Just wanted to say that I´m experiencing the same.
>  >  > Using latest rev (the one with patches merged) + unknown remote key patch.
>  >  > Ubuntu 7.10
>  >  >
>  >  > Also having a lot of "prebuffer timeout 10 times" i the middle of shows.
>  >
>  >  I think I might have a workaround... On Mythbuntu or one of the many Ubuntu
>  >  variants, this seems to work:
>  >
>  >  1)  Run:
>  >        lsmod |grep usbcore
>  >
>  >  2)  If step 1 produced any output that started with 'usbcore', then usbcore is
>  >  loaded as a module. Perform step 3a. Otherwise, step 3b.
>  >
>  >  3a) Create a text file called /etc/modprobe.d/local-dvb (the name is fairly
>  >  irrelevant). Insert one line of text into it:
>  >        options usbcore autosuspend=-1
>  >      Now go to step 4.
>  >
>  >  3b) Your kernel has usbcore built in. That means you have to modify the kernel
>  >  command line...
>  >      Edit /boot/grub/menu.lst (you'll need to sudo to do this). Search for
>  >  this line:
>  >  # defoptions=quiet splash
>  >      Amend it to read:
>  >  # defoptions=quiet splash usbcore.autosuspend=-1
>  >      It's meant to be commented out, so leave the hash at the beginning of the
>  >  line alone... Save and exit, then run ...
>  >  sudo update grub
>  >      Ubuntu will regenerate grub.conf, using the new kernel command line. Off
>  >  to step 4 you go!
>  >
>  >      If you're using a non-Debian distro (e.g. Fedora), do the same thing but
>  >  edit the 'kernel' line instead. It might read:
>  >  kernel          /boot/vmlinuz-2.6.24-8-generic root=LABEL=/ ro quiet splash
>  >      Change it to:
>  >  kernel          /boot/vmlinuz-2.6.24-8-generic root=LABEL=/ ro quiet splash
>  >  usbcore.autosuspend=-1
>  >
>  >  4)  Reboot your PC.
>  >
>  >  This is a bit long-winded, but saves a kernel recompile, and a ton of messing
>  >  around recompiling kernels when Ubuntu do another release.
>  >
>  >  I'm working on what I consider to be a better fix, which involves using the
>  >  kernel's Quirks function to disable USB suspend just for the DiBcom
>  >  controllers. That is, the kernel won't try and suspend them at all...
>  >
>  >
>  >
>  >  Thanks,
>  >  --
>  >  Phil.                         |  (\_/)  This is Bunny. Copy and paste Bunny
>  >  lists at philpem.me.uk           | (='.'=) into your signature to help him gain
>  >  http://www.philpem.me.uk/     | (")_(") world domination.
>  >
>
>  It was a module and i put the option i /etc/modprobe.d/options next to
>
> options dvb-usb-dib0700 force_lna_activation=1
>  Running now, will be back with the results.
>  On a side note:
>  Could that be the reason debug=15 also might work as a workaround,
>  there is so much traffic that the usb never suspends ?
>  Thanks Phil for the "fix", hope it stays stable..
>

20:37:40 up 1 day, 8 min ...and counting, both tuners working fine.

There are two:
[14153.150380] mt2060 I2C read failed
[18967.903269] mt2060 I2C read failed
recorded in dmesg but nothing fatal.



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