[mythtv-users] Channel scan does not work

Jens.Peder.Terjesen at devoteam.com Jens.Peder.Terjesen at devoteam.com
Fri Nov 21 12:42:19 UTC 2008

-----Andrew Junev: -----
>Hello All,
>I was using MythTV with two DVB-S tuners for quite some time now.
>Today I tried to scan for new channels and ... it didn't work. I ran
>mythtvsetup, went to Channel Editor, selected Transponder Scan
>(tuned), put the data of a transponder and then clicked Next - the
>mythtvsetup window just closed. In the terminal output I see the
>following error:
>Connected to database 'mythconverg' at host: localhost
>mythtvsetup: xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int)
>((xcb_req) - (dpy->request)) >= 0)' failed.
>I tried it with different transponders, different tuners - all the
>time it was the same. Here's some info about my system:
># uname -a
>Linux mythbackend #1 SMP Fri Oct 17 15:59:36 EDT 2008
>i686 i686 i386 GNU/Linux
># mythbackend --version
>Please include all output in bug reports.
>MythTV Version   : 18753M
>MythTV Branch    : branches/release-0-21-fixes
>Library API      : 0.21.20080304-1
>Network Protocol : 40
>Options compiled in:
> linux release using_oss using_alsa using_arts using_jack
>using_backend using_dbox2 using_dvb using_firewire using_frontend
>using_hdhomerun using_iptv using_ivtv using_joystick_menu
>using_libfftw3 using_lirc using_opengl_vsync using_opengl_video
>using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmcw
>using_xvmc_vld using_glx_proc_addr_arb using_bindings_perl
>using_bindings_python using_opengl using_ffmpeg_threads
>using_libavc_5_3 using_live
>I seem to have the latest mythtv version availble in the
>Any ideas on what the problem might be?
>Best regards,
> Andrew

What kind of CPU are you running this on?
There is an issue with mythtvsetup and hyperthreaded or multi-core CPUs.
If you have one of these try running mythtvsetup like this: taskset -c0

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