[linux-dvb] Couple of question regarding installation
frahm at irsamc.ups-tlse.fr
Sat Oct 14 22:16:47 CEST 2006
> Am Samstag, 14. Oktober 2006 16:35 schrieb Patrick Boettcher:
> > Where is the driver from you are using? Can you try the drivers from
> > latest hg (v4l-dvb)?
> I'm using only the drivers from the kernel (126.96.36.199) and the
> firmware. No other drivers? Do I need to v4l userscape stuff?
> horus linux # grep DVB .config
I am using the same DVB-T Tuner AverTV A800 USB 2.0 and it works fine
but there are some particularities/bugs/patches to take into account:
1) Concerning the modules you list I think you are missing some, in my
case I have:
grep DVB .config | grep -v "#"
I think here the support for 3000MB and DiBUSB_MB is not necessary (but
I still compiled these modules) but you absolutely need
CONFIG_DVB_USB_DIBUSB_MC=m which is normally well selected when you use
"make xconfig" to configure your kernel. I believe this is your present
frontend problem. Furthermore there is also DVB_PLL you will need (I
The modules I have loaded are (output from lsmod):
dvb_usb_a800 23940 0
dvb_usb_dibusb_common 26756 1 dvb_usb_a800
mt2060 22148 1 dvb_usb_dibusb_common
dib3000mc 29060 0 dvb_usb_dibusb_common
dibx000_common 20996 1 dib3000mc
dvb_usb 39944 2 dvb_usb_a800,dvb_usb_dibusb_common
dvb_core 101040 1 dvb_usb
firmware_class 27904 1 dvb_usb
dvb_pll 32644 1 dvb_usb_dibusb_common,dvb_usb
here the mt2060 is also loaded (from a quite late version of the driver
and in 2.6.17.x you will not have this one, that is okay).
2.) A part from you first order problem to have all modules there are
other problems which require your attention. In principle the driver for
the AverTV A800 works well but if you have the new version of this
tuner, such as me, than there is no need for a firmware the driver
version in kernel up to 2.6.18 will not properly initialize the module
(a confusion between cold and warm state). There is a simple patch you
can apply to solve this problem and which was discussed several months
ago between Patrick, me, and some other people:
the second link contains the patch and you can apply it to 2.6.17.x or
2.6.18 without any problem.
3.) There is also another bug/problem with the driver, maybe not with
the a800.c file but with the frontend or something related. After
getting a first lock there is no video flux until immediately getting a
second lock. With xine this does not create problem but with vlc you
have first to clic on stop and then on play to start the video flux.
There is also a nice work around using tzap. Details about this problem
and the work around in the second half of this message:
This problem is present in 2.6.17.x but it is repaired in 2.6.18 !!!
4.) And now the worst: There is NEW bug, corruption of the mpeg flux for
certain multiplexes !! I have tested this on two very different
machines. This bug is new and appears in the latest drivers. I will
report about this bug/problem in a different thread. For the moment
being I strongly suggest that you DO NOT USE use the very latest
DVB-driver from the official tree neither the driver which is actually
also in 2.6.19-rc1 (=> DO NOT USE either 2.6.19-rc1), at least the
official tree one week ago had this bug (I didn't verify later
In summary to get a working driver, I suggest in the following order of
1) Download and compile the kernel 2.6.18 and apply the very small patch
to the file a800.c in "drivers/media/dvb/dvb-usb/a800.c" which I mention
in point 2.) above. In this way you will get a working driver without
any bugs (neither bug 2, 3, 4 of this list). Of course you need to
compile all necessary modules, i.e. solve your actual problem.
2) If you stick with 2.6.17.x or 2.6.16.x than you can still apply the
same patch to repair the bug 2 (cold-warm-state problem) but you still
have the other bug 3 (the first-lock-problem) for which there are
workarounds which are not very tough (essentially calling vlc in script
with calling tzap before).
3) If you want to use the latest DVB-tree possible, you can take one
which is at least 3-4 weeks old (if that is technically possible with
the "hg"-download method ??) and combine it with every kernel version
since 2.6.12 or 2.6.13 (I believe). I am actually using 2.6.19-rc1 but
with the DVB v4l-tree from 12 August 2006 in which all bugs 2 and 3 are
also repaired and bug 4 is not yet present. I believe the bug 4 appeared
about 3-4 weeks ago, some time in september.
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