Ubuntu
linux package

  1. Bug #256492
  2. Comment #9

Comment 9 for bug 256492

Revision history for this message
Moonshade (moonshade) wrote :

Same problem here:

Motherboard GA-MA78GM-US2H with AMD SB700 USB chipset.

If two USB devices connected to same pair of USB ports start consuming bandwidth, USB stream gets corrupted. Sometimes silently, sometimes with kernel messages like: bulk message failed: -110, i2c errors and so on.

Tested with two different USB DVB-T tuners: dvb_usb_af9015 and dvb_usb_ce6230. If both tuners zapped to channel - stream gets corrupted (both tuners report zero bit errors rate and decent SNR, so its USB issue).

If I replace one tuner with USB flash drive and start copying some big file - same thing, corruption of USB stream. External USB hub doesn't help either. In order to get both devices to work correctly you have to put them on different pairs of USB ports.

Tested on Jaunty 9.04 x64 using latest DVB drivers from http://linuxtv.org/hg/v4l-dvb.
Kernels tested:
2.6.28-14-generic with security updates
2.6.31-020631rc4-generic, latest of KernelMainlineBuilds