bktr(4) distorted picture in overlay mode

[Martin]

Hi,

I've upgraded my hardware. Now bktr(4) does not work perfectly
as it always did. I've tried two applications xawtv and fxtv.
Both show exactly the same reaction.

The picture in overlay mode is being drawn, but most of the
time only every second scanline. Sometimes the scanlines
in between can be drawn and half of the picture stays on
the screen for a few seconds making it impossible to enjoy
TV. When I keep the window small or pick 320x240 the picture
looks quite acceptable.

Are there any problems with VIA chipsets? I've tried
"options BKTR_SIS_VIA_MODE" but it didn't help.

My kernel settings for bktr(4) are now:
device	bktr
options OVERRIDE_CARD=2
options OVERRIDE_MSP=2
options BROOKTREE_SYSTEM_DEFAULT=BROOKTREE_PAL
options BKTR_NEW_MSP34XX_DRIVER
options	BKTR_GPIO_ACCESS
options BKTR_SIS_VIA_MODE

Relevant info from dmesg:

agp0: <VIA 8377 (Apollo KT400/KT400A/KT600) host to PCI bridge>
mem 0xe0000000-0xe3ffffff at device 0.0 on pci0
nvidia0: <GeForce4 Ti 4200> mem
0xddc80000-0xddcfffff,0xd0000000-0xd7ffffff,0xde000000-0xdeffffff
irq 16 at device 0.0 on pci1
bktr0: <BrookTree 878> mem 0xdddfe000-0xdddfefff irq 19 at device
11.0 on pci0
bktr0: Hauppauge Model 44804 C108
bktr0: Detected a MSP34255?-?31 at 0x80
bktr0: Hauppauge WinCast/TV, Philips PAL I tuner,  msp3400c stereo.

uname:
5.4-PRERELEASE FreeBSD 5.4-PRERELEASE #1:
Sat Mar 19 01:15:59 CET 2005 i386

The bug was reported in kern/56245 for 5.1 and it still persists.
Is there a bugfix available? What else can I try?

Martin