dvb-s usb problems

[Matthias Lay <loomy@gmx.li>]

Hi all,

I am having some problems getting some channels to work on usb dvb-s
devices.
tried 2 so far a skystar and teviis660 both have the same problem.

I am about to switch from an PCI-e card to a usb hosted solution. My
PCI-e setup (skystar too) never had any problems.

both systems on a 4.9 Kernel. Astra 19,2

Problem on the USB system

using dvb-utils scan, It doesnt find any HD channels. the only one is
WDR HD which seems to be the only one using QPSK. the other are 8PSK I
think. 

using mythbackend, I am able to scan and find the channels, but when
its recording, the quality is poor with a lot of errors in the picture.

nothing in dmesg, but if I do a "scan -c" using dvb-utils after
mythbackend locked one of the channels I get

***************************************
open("/dev/dvb/adapter0/demux0", O_RDWR|O_NONBLOCK) = 4
ioctl(4, 0x403c6f2b, 0xbeac6f48)        = -1 EINVAL (Invalid argument)
write(2, "start_filter:1752: ERROR: ioctl "..., 75start_filter:1752:
ERROR: ioctl DMX_SET_FILTER failed: 22 Invalid argument ) = 75
ioctl(4, 0x6f2a, 0x1)                   = 0
close(4)                                = 0
open("/dev/dvb/adapter0/demux0", O_RDWR|O_NONBLOCK) = 4
ioctl(4, 0x403c6f2b, 0xbeac6f48)        = -1 EINVAL (Invalid argument)
write(2, "start_filter:1752: ERROR: ioctl "..., 75start_filter:1752:
ERROR: ioctl DMX_SET_FILTER failed: 22 Invalid argument ) = 75
ioctl(4, 0x6f2a, 0x1)                   = 0
close(4)                                = 0
*********************************************************


is this a known problem? you have any hint for me, where to check for
the problem?

Greetz loomy