On Mon, 25 Mar 2002, Wan Tat Chee wrote: > >What happens if you temporary disble this change?: > > > >--- saa7134-video.c.1 Sat Mar 23 10:46:41 2002 > >+++ saa7134-video.c Sat Mar 23 10:52:54 2002 > >@@ -429,8 +429,10 @@ > > > > mux = card_in(dev,dev->ctl_input).vmux; > > luma_control = norm->luma_control; > >+#if 0 > > if (mux > 5) > > luma_control |= 0x80; /* svideo */ > >+#endif > > > > /* setup video decoder */ > > saa_writeb(SAA7134_INCR_DELAY, 0x08); > > > I'll try that later and see if it degrades on my backported March 11 > snapshot. > Ok. Disabling the luma_control makes the video quality worse. The patch is correct. > > >> + vmux: 8, > > > >What happens if you change the input mode (vmux) for S-Video from 8 to 6? > > > >mode 6: Y channel with automatic gain control, C channel with fix gain (GAI2). > >mode 8: Y channel with automatic gain control, C channel linked to Y-channel. > > On my backported March 11 snapshot, using mode 6 gives a grainy (degraded) > signal, while mode 8 works fine. > Now I found out that either video modes (6 or 8) work fine, though based on your description, mode 8 would probably be the correct mode. I suspect the problem is that luma_control / set_tv_norms() is called only upon a channel change. If I fiddle with pgup/pgdown, the picture quality becomes good again. Just switching between Composite Video and S-Video doesn't seem to update the luma_control bit and either S-Video or Composite Video has a degraded video signal. All this was tested using the Backported March 11 snapshot on 2.4.19-pre3ac3. However, I still have major problems with saa7134-0.1.5 + 2.4.19-pre4 in XWindows. I/O access to the TV Tuner seems to be blocked (xawtv TV input shows static on all channels), S-Video always has degraded (grainy) picture. Video Source switching seems to work though. I tried it with and without NVdriver, but it doesn't seem to make any difference. Is it possible to switch Video inputs in fbtv so I can verify if it occurs there? T.C. ---- Wan Tat Chee (Lecturer) School of Computer Science, Univ. Science Malaysia, 11800 Minden, Penang, Malaysia. Ofc Ph: +604 657-7888 x 3617 Internet: tcwan@xxxxxxxxx Web: http://nrg.cs.usm.my/~tcwan GPG Key : http://nrg.cs.usm.my/~tcwan/tcw_gpg.asc F'print : FB0F CED7 85A5 ECF9 DEF0 50E8 A550 A0D2 8638 B1EB
