Problem::Nexus-s 2.3::NTSC output

[andreyv at ece.ubc.ca (Andrey Vlasov)]

Hi,

I can not make Nexus-s 2.3 to work in NTSC mode. I have applied 
suggested patch

--- dvb-kernel/linux/drivers/media/dvb/ttpci/av7110_av.c.orig   2005-02-17
11:30:15.000000000 -0800
+++ dvb-kernel/linux/drivers/media/dvb/ttpci/av7110_av.c        2005-02-17
11:32:50.000000000 -0800
@@ -1429,7 +1429,7 @@
        void (*play[])(u8 *, int, void *) = { play_audio_cb, play_video_cb };
        int i, ret;

-       av7110->vidmode = VIDEO_MODE_PAL;
+       av7110->vidmode = VIDEO_MODE_NTSC;

        for (i = 0; i < 2; i++) {
                struct ipack *ipack = av7110->ipack + i;

but still experience the problem. I can not explain but it did work once and now I got same problem.
Can anybody suggest what I should try else?

Info:
OS: Fedora Core 2
DVB driver: CVS
VDR: 1.3.22
Plugins: remote rotor
Location: North America/Canada
Symptoms: rolling image on TV in B/W