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[Simon Lambourn <2067895@xxxxxxxxxxxxxxxxxx>]

dmesg output:

$ sudo dmesg |grep dvb
[   21.100050] saa7134_dvb: dvb_init() allocating 1 frontend
[   21.248215] em28xx 2-2:1.0: dvb set to isoc mode.
[   21.596207] dvbdev: DVB: registering new adapter (saa7130[0])
[   21.596232] dvbdev: dvb_create_media_entity: media entity 'NXP TDA10048HN DVB-T' registered.
[   21.599068] dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
[   21.724204] tda10048_firmware_upload: waiting for firmware upload (dvb-fe-tda10048-1.0.fw)...
[   30.545497] dvbdev: DVB: registering new adapter (2-2:1.0)
[   30.545509] dvbdev: dvb_create_media_entity: media entity 'Silicon Labs Si2168' registered.
[   30.547906] dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
[   30.551147] em28xx: Registered (Em28xx dvb Extension) extension
[   78.147389] si2168 11-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[   78.845473] si2168 11-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'

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https://bugs.launchpad.net/bugs/2067895

Title:
  Mythtv can no longer access DVB devices after ubuntu 24.04 upgrade

Status in mythtv package in Ubuntu:
  New

Bug description:
  Before upgrade, mythtv was working with two separate DVB tuners.
  After upgrade, mythtv can see the /dev/dvb adapters but cannot access them ("could not get card info for /dev/dvb/adapter0/frontend0").  All recordings since the upgrade to ubuntu 24.04 have failed.

  The devices seem to have the right permissions and mythtv-backend is
  running as mythtv, which is a member of the video group:

  ls -al /dev/dvb/adapter?
  /dev/dvb/adapter0:
  total 0
  drwxr-xr-x  2 root root     120 Jun  3 10:21 .
  drwxr-xr-x  4 root root      80 Jun  3 10:21 ..
  crw-rw----+ 1 root video 212, 1 Jun  3 10:21 demux0
  crw-rw----+ 1 root video 212, 2 Jun  3 10:21 dvr0
  crw-rw----+ 1 root video 212, 0 Jun  3 10:21 frontend0
  crw-rw----+ 1 root video 212, 3 Jun  3 10:21 net0

  /dev/dvb/adapter1:
  total 0
  drwxr-xr-x  2 root root     120 Jun  3 10:21 .
  drwxr-xr-x  4 root root      80 Jun  3 10:21 ..
  crw-rw----+ 1 root video 212, 5 Jun  3 10:21 demux0
  crw-rw----+ 1 root video 212, 6 Jun  3 10:21 dvr0
  crw-rw----+ 1 root video 212, 4 Jun  3 10:21 frontend0
  crw-rw----+ 1 root video 212, 7 Jun  3 10:21 net0

  lsof /dev/dvb   and fuser /dev/dvb do not report any users of the
  devices (I hope I am using the command correctly)

  Expected behaviour:   mythtv can access the DVB tuners and use them
  for live TV & recordings, as previously.

  Ubuntu is now 24.04 Noble Numbat, after upgrading from 23.10.
  Mythtv is now 2:34.0+fixes.20240210.e3e165a1-0ubuntu6

  I am using the web frontend to access mythtv backend setup.
  mythbackend.log has the following entries:

  2024-06-03T10:56:06.285978+01:00 gracix2 mythbackend: mythbackend[2706]: E HTTP0 cardutil.cpp:1249 (OpenVideoDevice) CardUtil: Can't open DVB frontend (/dev/dvb/adapter0/frontend0) for /dev/dvb/adapter0/frontend0.#012#011#011#011eno: Device or resource busy (16)
  2024-06-03T10:56:06.448387+01:00 gracix2 mythbackend: mythbackend[2706]: E HTTP0 cardutil.cpp:928 (ProbeCurrentDeliverySystem) CardUtil: open failed (/dev/dvb/adapter0/frontend0)#012#011#011#011eno: Device or resource busy (16)
  2024-06-03T10:56:06.448744+01:00 gracix2 mythbackend: mythbackend[2706]: E HTTP0 cardutil.cpp:1249 (OpenVideoDevice) CardUtil: Can't open DVB frontend (/dev/dvb/adapter1/frontend0) for /dev/dvb/adapter1/frontend0.#012#011#011#011eno: Device or resource busy (16)
  2024-06-03T10:56:06.449107+01:00 gracix2 mythbackend: mythbackend[2706]: E HTTP0 cardutil.cpp:928 (ProbeCurrentDeliverySystem) CardUtil: open failed (/dev/dvb/adapter1/frontend0)#012#011#011#011eno: Device or resource busy (16)

  It says the device is busy, but as far as I can tell there is nothing
  using the device?

  Thank you in advance for any help.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: mythtv 2:34.0+fixes.20240210.e3e165a1-0ubuntu6
  ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
  Uname: Linux 6.8.0-31-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Jun  3 10:57:46 2024
  Installed_mythtv_dbg: 0.0
  PackageArchitecture: all
  SourcePackage: mythtv
  UpgradeStatus: No upgrade log present (probably fresh install)

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