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

Patrik Hansson patrik at wintergatan.com
Tue Feb 26 20:37:45 CET 2008

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..

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