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)
....it'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,
Bob
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
--
Michael Krufky
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