Re: BTTV broken on recent kernels

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Bob Gill wrote:

Alistair John Strachan wrote:

On Monday 16 January 2006 02:05, Bob Gill wrote:
Hi.  The last several kernel versions have led to broken bttv (up to 4
or 5 kernel versions ago, I could watch tv on either mplayer or xawtv),
but lately bttv is broken. My card is an 'bt878 compatible built by ATI
(ATI TV Wonder VE).  I'm pretty certain it worked as late as
2.6.14-git7. I've peeked around /Changes and didn't see anything. I'm
using the same build script as before, and a piece of lsmod shows
serial_core            14848  1 8250
rtc                     9524  0
tuner                  36908  0
bttv                  148564  0
video_buf              15748  1 bttv
compat_ioctl32          1152  1 bttv
i2c_algo_bit            7432  1 bttv
v4l2_common             6528  2 tuner,bttv
btcx_risc               3720  1 bttv
ir_common               7812  1 bttv
tveeprom               12304  1 bttv
i2c_core               14864  4 tuner,bttv,i2c_algo_bit,tveeprom
videodev                6912  1 bttv
snd_emu10k1            94628  2 snd_emu10k1_synth
..........also, a chunk of lspci shows:
0000:00:09.1 Input device controller: Creative Labs SB Live! MIDI/Game
Port (rev 07)
0000:00:0b.0 Multimedia video controller: Brooktree Corporation Bt878
Video Capture (rev 02)
0000:00:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio
Capture (rev 02)'s just that I get a blank (screen blanking due to no signal)
screen when I start a tv application. I can try to change channels/tune
frequencies, and it looks like the applications are trying, but nothing
gets tuned in.   To be fair, I must mention that I *ahem* taint the
kernel with Nvidia stuff, and recently upgraded gcc (although it has
always worked well with tainted kernel, and it broke before I upgraded
gcc (to gcc version 4.0.2) on Debian Sarge.

This problem sounds suspiciously like an overlay bug, known in the binary NVIDIA driver. Please try changing it to "nv" in XF86Config, then restarting your TV application..

If you *really* want, I can revert XF86Config to use non-nvidia drivers (and revert back to the old
version of gcc) and give a bug report from that, but I suspect things
will remain broken.  Mplayer compiles very well with the new version of
gcc, and the new kernel (buit with the new version of gcc) does
everything else (sound, firewire, cd/dvd/networking, disk I/O etc.)
without problems.
Thanks in advance,

Alistair, Lee: thank you for your replies. Sadly the bug is in the Nvidia binary. Changing the driver to nv from nvidia did resolve the issue. Now I have to decide whether I like accelerated 3d more, or using the tv tuner more (till Nvidia fixes the driver). Thank you for your time. I won't waste any more LKML bandwidth on this (Nvidia bug). Thanks again. Bob
Not that I would recommend the binary nvidia driver, but:

You can probably get bttv to work despite this overlay bug by using "grabdisplay" mode instead. There is an option for it in xawtv. The difference is, in overlay mode, the capture card is writing directly to videoram. Using grabdisplay mode eliminates this optimization, and would be a decent workaround for you.
Hope this helps,


Michael Krufky

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