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| Twinhan VisionPlus DVB-T device issues on Fedora Core 4 |
skiman65
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After having some battles this week with getting my Twinhan VisionPlus DVB-T card to work with Fedora Core 4 (2.6.12-1.1447_FC4), I thought I would post a summary of what I had to do to get it going. Basically I wanted to get everything going from a TV card perspective before delving into the MythTV setup (which BTW is about 80% done now).
lspci -v:
Code:
...
02:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
Subsystem: Twinhan Technology Co. Ltd VisionPlus DVB card
...
02:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)
Subsystem: Twinhan Technology Co. Ltd VisionPlus DVB Card
First off, the card - a Bt878 chipset card - is recognised fine by the kernel. However, /dev/video0 was not being created as a device, and the DVB drivers were not being loaded.
1. /dev/video0 not created when Bt878 driver loaded with modprobe
I read several other posts elsewhere saying "just run 'mknod /dev/video0 c 81'. Well let me just say this just did not work! To test it, I ran 'xawtv-3.94 -debug 2' as root:
Code:
v4l-conf had some trouble, trying to continue anyway
vid-open: trying: v4l2-old...
v4l2: open /dev/video0: No such file or directory
vid-open: failed: v4l2-old
vid-open: trying: v4l2...
v4l2: open /dev/video0: No such file or directory
vid-open: failed: v4l2
vid-open: trying: v4l...
v4l: open /dev/video0: No such file or directory
vid-open: failed: v4l
no video grabber device available
After a lot of seeking in /sys, diving in /dev and bashing with udev, this change got it working:
- Create /etc/udev/rules.d/06-dvb.rules and add the following lines:
Code:
KERNEL="dvb*", PROGRAM="/etc/udev/scripts/dvb.sh %k", NAME="%c"
SYSFS{vendor}="0x109e", PROGRAM="/etc/udev/scripts/dvb.sh %k", NAME="video0"
- Edit /etc/udev/scripts/dvb.sh and check it has the following
Code:
#!/bin/sh
/bin/echo $1 | /bin/sed -e 's,dvb\([0-9]\)\.\([^0-9]*\)\([0-9]\),dvb/adapter\1/\2\3,'
Notes:
- the second line in the rules file matches the vendor ID from the card and tells udev to create /dev/video0, properly (as opposed to using mknod, which doesn't)
- the vendor ID is obtained by running 'udevinfo -a -p /sys/devices/pci0000:00/0000:00:1e.0/0000:02:0b.0/', or by just poking around in /sys
- the 02:0b.0 comes from the lspci entry for the TV card
- Run 'modprobe -v i2c_dev'
Even after adding the rules file above, /dev/video0 still wan't created by udev. After 'modprobe i2c_dev' was run, this appears in /var/log/messages:
Code:
Sep 14 16:40:52 localhost kernel: i2c /dev entries driver
Sep 14 16:40:52 localhost udev[10401]: udev_rules.c: configured rule in '/etc/udev/rules.d/06-dvb.rules[2]' applied, 'i2c-0' becomes 'video0'
Sep 14 16:40:52 localhost udev[10401]: udev_add.c: creating device node '/dev/video0'
- Check that /dev/video0 is there and permissions etc are correct
# ls -l /dev/video0
Code:
crw-rw---- 1 root root 89, 0 Sep 14 16:44 /dev/video0
Note I also then had to 'chown mythtv:users /dev/video0' and 'chown mythtv:users /dev/dvb/adapter0/*'
2. 'modprobe bt878' does not load all the DVB drivers!
- Run 'modprobe -v dvb-bt8xx'
A 'modprobe bt878' does not automagically load the DVB drivers, only the standard Bt8x8 drivers.
'modprobe -v dvb-bt8xx' loads the following modules:
Code:
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/frontends/or51211.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/frontends/cx24110.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/dvb-core/dvb-core.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/videodev.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/tveeprom.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/btcx-risc.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/v4l2-common.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/i2c/algos/i2c-algo-bit.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/video-buf.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/video/bttv.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/bt8xx/bt878.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/bt8xx/dst.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/bt8xx/dst_ca.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/frontends/sp887x.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/frontends/mt352.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/frontends/nxt6000.ko
insmod /lib/modules/2.6.12-1.1447_FC4/kernel/drivers/media/dvb/bt8xx/dvb-bt8xx.ko
---
After all that, I finally got xawtv to at least recognise /dev/video0. However, xawtv 3.94 doesn't seem to fully support DVB, so I installed kaffeine-0.6-1.1.fc3.rf.i386.rpm.
The MythTV box in question does not (yet) have a working sound card (another saga) so I edited the xine config: ~/.kde/share/apps/kaffeine/xine-config: audio.driver:none
After that, Kaffeine started up fine. Note that adding the sound card in causes Kaffeine to hang when double-clicking a program to view - this will be investigated further.
Note that you may NOT need to perform all of the above to get it working; this is just a summary of what *I* had to do. Also regarding the udev changes, it may not be the *correct* way to do it, so comments are welcome. Hopefully all this is of help to someone else! |
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juski
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| Well done.... editing udev rules really isn't for the faint-hearted, as you've no doubt discovered! |
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| Go to the original "Twinhan VisionPlus DVB-T device issues on Fedora Core 4" thread |
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