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    SubjectRe: [linux-dvb-maintainer] Multiple USB DVB devices cause hard lockups
    On Wed, Nov 09, 2005 Hugo Mills wrote:
    > I'm trying to get a pair of Twinhan Alpha II DVB-USB devices
    > working on the same machine. With a single device plugged in, I can
    > quite easily receive and stream data.
    >
    > With both devices connected to the machine, both are recognised.
    > However, use of either device causes some form of stack backtrace (I
    > can't see the top of it to verify what kind) from the kernel, and a
    > hard lock-up. Magic SysRQ is non-functional after the lock-up. Failure
    > cases that I've seen are:

    Maybe Patrick can comment, I believe he tested with multiple
    USB devices.
    I can't do much with this report without the kernel messages :-(

    Johannes


    > - Streaming from device 0 is OK for a few seconds, and then the
    > system locks hard.
    >
    > - Streaming from device 0 is OK. Streaming from device 1 before
    > device 0 crashes locks the device 1 process in D state, and then
    > locks the system hard a few seconds later.
    >
    > I've observed this behaviour on both 2.6.12.2 and 2.6.14. No logs
    > were left from the crashes, and only incomplete information on screen,
    > so I presume that I'll need to get a serial console set up to capture
    > output. A log of the devices being identified on boot-up is attached
    > below, for what it's worth (probably not much).
    >
    > Hugo.
    >
    > Nov 9 11:49:48 src@vlad kernel: ehci_hcd 0000:00:0c.2: EHCI Host Controller
    > Nov 9 11:49:48 src@vlad kernel: ehci_hcd 0000:00:0c.2: new USB bus registered, assigned bus number 1
    > Nov 9 11:49:48 src@vlad kernel: ehci_hcd 0000:00:0c.2: irq 12, io mem 0xd4000000
    > Nov 9 11:49:48 src@vlad kernel: ehci_hcd 0000:00:0c.2: park 0
    > Nov 9 11:49:48 src@vlad kernel: ehci_hcd 0000:00:0c.2: USB 2.0 initialized, EHCI 1.00, driver 10 Dec 2004
    > Nov 9 11:49:48 src@vlad kernel: hub 1-0:1.0: USB hub found
    > Nov 9 11:49:48 src@vlad kernel: hub 1-0:1.0: 5 ports detected
    > Nov 9 11:49:48 src@vlad kernel: usb 1-2: new high speed USB device using ehci_hcd and address 2
    > Nov 9 11:49:48 src@vlad kernel: usb 1-3: new high speed USB device using ehci_hcd and address 3
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: found a 'Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)' in warm state.
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
    > Nov 9 11:49:48 src@vlad kernel: DVB: registering new adapter (Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)).
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: MAC address: 08:ff:ff:ff:ff:ff
    > Nov 9 11:49:48 src@vlad kernel: DVB: registering frontend 0 (Twinhan VP7045/46 USB DVB-T)...
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: schedule remote query interval to 400 msecs.
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II) successfully initialized and connected.
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: found a 'Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)' in warm state.
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
    > Nov 9 11:49:48 src@vlad kernel: DVB: registering new adapter (Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)).
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: MAC address: 08:ff:ff:ff:ff:ff
    > Nov 9 11:49:48 src@vlad kernel: DVB: registering frontend 1 (Twinhan VP7045/46 USB DVB-T)...
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: schedule remote query interval to 400 msecs.
    > Nov 9 11:49:48 src@vlad kernel: dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II) successfully initialized and connected.
    > Nov 9 11:49:48 src@vlad kernel: usbcore: registered new driver dvb_usb_vp7045
    > Nov 9 11:49:48 src@vlad kernel: ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
    >
    > --
    > === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
    > PGP key: 1C335860 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
    > --- "Your problem is that you have a negative personality." ---
    > "No, I don't!"



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