Opened 11 years ago

Closed 11 years ago

#5038 closed defect (invalid)

Scanning of ATSC channels on tuner cards stops at channel 78

Reported by: bob@… Owned by: danielk
Priority: major Milestone: unknown
Component: channelscan Version: 0.21-fixes
Severity: high Keywords: ATSC DVB PCI PCI-Express
Cc: Ticket locked: no

Description

When using a PCI or PCI-Express DVB card in a channel scan operation in mythtv-setup, the last ATSC channel scanned is always 78. Channels 79-83 are skipped, but the status window in the background is updated instantly with a "Timeout Scanning ATSC Channel" message for all the skipped channels.

Conversely, doing an ATSC channel scan with an HDHomeRun does take the time to scan channels 79-83, rather than just skip them.

I'm reporting this as a 0.21-fixes bug, but I verified the same behavior in 0.20.2 as well with a subset of the cards. Cards tested: pcHDTV hd-5500, BBTI HD5000AV, Hauppauge HVR-1800.

The error output from mythtv-setup is as follows for each skipped channel:

2008-03-25 15:35:53.362 DVBChan(1:0) Error: Tune(): Setting Frontend tuning parameters failed.

eno: Invalid argument (22)

Change History (1)

comment:1 Changed 11 years ago by danielk

Resolution: invalid
Status: newclosed

The driver for your DVB card does not support channels over 78 for the 8-VSB modulation. So it's not a MythTV problem, but a problem with the driver.

This is probably a copy-n-paste bug in the driver from an early ATSC card which had very limited tuner hardware and was restricted the subset of the 8-VSB broadcasts that are broadcast OTA in the US. The US no longer issues new broadcast licenses above channel 69... The copy-n-paste was probably from the Air2PC rev 1.

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