udev creates dvb directory with wrong permissions

[Andreas Moog]

I have a dvb-S tv tuner card (Technisat SkyStar 2) installed, the drivers are loaded and udev creates the appropriate device nodes. Except, the permissions and ownership of the /dev/dvb and /dev/dvb/adapter0 directories are wrong (root:root instead of root:video). This results in a ordinary user not being able to access the card.

helmut@helmut-desktop:~$ groups
helmut adm lp dialout cdrom video plugdev lpadmin admin sambashare vboxusers
helmut@helmut-desktop:~$ ls /dev/ -la | grep dvb
drw-r----- 3 root root 60 Mai 3 11:55 dvb
helmut@helmut-desktop:~$ ls /dev/dvb
ls: Öffnen von Verzeichnis /dev/dvb nicht möglich: Keine Berechtigung
helmut@helmut-desktop:~$ sudo ls /dev/dvb -la
[sudo] password for helmut:
insgesamt 0
drw-r----- 3 root root 60 Mai 3 11:55 .
drwxr-xr-x 17 root root 4460 Mai 3 11:55 ..
drw-r----- 2 root root 120 Mai 3 11:55 adapter0
helmut@helmut-desktop:~$ sudo ls /dev/dvb/adapter0 -la
insgesamt 0
drw-r----- 2 root root 120 Mai 3 11:55 .
drw-r----- 3 root root 60 Mai 3 11:55 ..
crw-rw----+ 1 root video 212, 0 Mai 3 11:55 demux0
crw-rw----+ 1 root video 212, 1 Mai 3 11:55 dvr0
crw-rw----+ 1 root video 212, 3 Mai 3 11:55 frontend0
crw-rw----+ 1 root video 212, 2 Mai 3 11:55 net0
helmut@helmut-desktop:~$

The udev rules file is unchanged, the matching entry being:
(/lib/udev/rules.d/50-udev-default.rules)

SUBSYSTEM=="dvb", GROUP="video"

sudo udevadm info --query=all --attribute-walk --name=/dev/dvb/adapter0/demux0 brings:

  looking at device '/devices/pci0000:00/0000:00:14.4/0000:03:03.0/dvb/dvb0.demux0':
    KERNEL=="dvb0.demux0"
    SUBSYSTEM=="dvb"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:14.4/0000:03:03.0':
    KERNELS=="0000:03:03.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="b2c2_flexcop_pci"
    ATTRS{vendor}=="0x13d0"
    ATTRS{device}=="0x2103"
    ATTRS{subsystem_vendor}=="0x13d0"
    ATTRS{subsystem_device}=="0x2103"
    ATTRS{class}=="0x028000"
    ATTRS{irq}=="21"
    ATTRS{local_cpus}=="00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003"
    ATTRS{local_cpulist}=="0-1"
    ATTRS{numa_node}=="0"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{enable}=="1"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}==""

As a workaround I use a script to set the correct permissions, however it would be nice to have this working out of the box.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: udev 175-0ubuntu9
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CheckboxSubmission: 1fbcf2fff5a20e144142fab6a590f695
CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
CustomUdevRuleFiles: 71-dvb.rules 98_smfpautoconf_samsung.rules 99_smfpautoconf_samsung.rules
Date: Thu May 3 12:02:46 2012
MachineType: MICRO-STAR INTERANTIONAL CO.,LTD MS-7373
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=d68114ca-0252-4593-9d0a-c9e596d607a3 ro xforcevesa quiet splash
SourcePackage: udev
UpgradeStatus: Upgraded to precise on 2012-04-27 (5 days ago)
dmi.bios.date: 10/31/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.1
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MS-7373
dmi.board.vendor: MICRO-STAR INTERANTIONAL CO.,LTD
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.1:bd10/31/2007:svnMICRO-STARINTERANTIONALCO.,LTD:pnMS-7373:pvr1.0:rvnMICRO-STARINTERANTIONALCO.,LTD:rnMS-7373:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: MS-7373
dmi.product.version: 1.0
dmi.sys.vendor: MICRO-STAR INTERANTIONAL CO.,LTD

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[YAFU (yafu)]

Old and still unresolved bug in Kernel patched by Ubuntu.

@Andreas Moog, could you share the workaround or script that you used to change permissions?
Thank you.

Tags: ubuntu dvb dvb-t does not work vlc kaffeine totem

[YAFU (yafu)]

Sorry. I'm seeing that the permissions are apparently right using the Kernel 3.2.0-29 (Kubuntu 12.04 64bits). Likewise, no program can have access to my USB tuner (MyGica S870 using "dvb_usb_dib0700" module driver). When I try to watch TV VLC freezes and I have to kill the process. MPlayer, Kaffeine and Totem (GNOME dvb-daemon) not working too.
Kaffeine message:
kaffeine(6273) DvbLinuxDevice::tune: ioctl FE_SET_FRONTEND failed for frontend "/dev/dvb/adapter0/frontend0"

Using the PPA mainline kernels VLC works (the other programs still can not access the device)

$ groups
yafu adm disk cdrom sudo audio dip video plugdev scanner lpadmin netdev sambashare debian-tor vboxusers jupiter

[bluearcus (mike-miller-gmx)]

Both 32 and 64 bit 12.04 are showing this problem for me, with two different USB DVB tuner dongles.

/dev/dvb and all device nodes beneath are created with user and group ownership of root. By default the group ownership should be video.

At the moment I have to add local udev rules based on the USB device IDs to change the ownership with a script.

[Simon Davis (davis-decent)]

Interestingly, the bug is still present in 19.10.

$ ls -l /dev/dvb/adapter0/
total 0
crw-rw----+ 1 root video 212, 0 Feb 24 09:57 demux0
crw-rw----+ 1 root video 212, 1 Feb 24 09:57 dvr0
crw-rw----+ 1 root video 212, 3 Feb 24 09:57 frontend0
crw-rw----+ 1 root video 212, 2 Feb 24 09:57 net0