Re: ZTE modem problems and workrounds

[Valmantas Palikša <walmis gmail com>]

I've discovered an interesting quirk on my zte mf633.

If I leave it connected in the usb port and all ttyUSB's are closed this
happens after 15 minutes or so:

option1 ttyUSB0: GSM modem (1-port) converter now disconnected from
ttyUSB0
option 1-8:1.0: device disconnected
option1 ttyUSB1: GSM modem (1-port) converter now disconnected from
ttyUSB1
option 1-8:1.1: device disconnected
option1 ttyUSB2: GSM modem (1-port) converter now disconnected from
ttyUSB2
option 1-8:1.3: device disconnected
usb 1-8: reset high speed USB device using ehci_hcd and address 15
usb 1-8: device descriptor read/64, error -110
usb 1-8: device descriptor read/64, error -110
usb 1-8: reset high speed USB device using ehci_hcd and address 15
usb 1-8: device descriptor read/64, error -110
usb 1-8: device descriptor read/64, error -110
usb 1-8: reset high speed USB device using ehci_hcd and address 15
usb 1-8: device not accepting address 15, error -110
usb 1-8: reset high speed USB device using ehci_hcd and address 15
usb 1-8: device not accepting address 15, error -110
sd 14:0:0:0: Device offlined - not ready after error recovery
usb 1-8: USB disconnect, address 15
usb 1-8: new high speed USB device using ehci_hcd and address 16
usb 1-8: device descriptor read/64, error -110
usb 1-8: device descriptor read/64, error -110
usb 1-8: new high speed USB device using ehci_hcd and address 17
usb 1-8: device descriptor read/64, error -110
usb 1-8: device descriptor read/64, error -110
usb 1-8: new high speed USB device using ehci_hcd and address 18
usb 1-8: device not accepting address 18, error -110
usb 1-8: new high speed USB device using ehci_hcd and address 19
usb 1-8: device not accepting address 19, error -110
hub 1-0:1.0: unable to enumerate USB device on port 8
usb 5-2: new full speed USB device using uhci_hcd and address 2
usb 5-2: device descriptor read/64, error -110
usb 5-2: device descriptor read/64, error -110
usb 5-2: new full speed USB device using uhci_hcd and address 3
usb 5-2: device descriptor read/64, error -110
usb 5-2: device descriptor read/64, error -110
usb 5-2: new full speed USB device using uhci_hcd and address 4
usb 5-2: device not accepting address 4, error -110
usb 5-2: new full speed USB device using uhci_hcd and address 5
usb 5-2: device not accepting address 5, error -110
hub 5-0:1.0: unable to enumerate USB device on port 2

If I open ttyUSB1 with cutecom and leave it open it works fine.


On Tue, 2009-06-30 at 21:46 +0100, Rick Jones wrote:
> I've had quite a bit of trouble getting a ZTE 627 3G modem to work
> reliably with NM. I've spent a lot of time testing, poking, and
> prodding, and there are problems in several areas. Not all of this is
> NM directly, but it all impinges.
> 
> I've posted everything I've found on the Ubuntu forums, specifically
> this post:
> <http://ubuntuforums.org/showthread.php?p=7539275#post7539275>, please
> refer to this (and some earlier posts in that thread) rather than me
> re-post everything here. 
> 
> You'll see that there seem to be issues with the "option" serial modem
> driver, as well as udev and/or hal device detection, and NM's
> interactions. Any suggestions as to the best way to report these bugs?
> - they seem to relate to rather disparate parts of the system, but
> which must end up working together.
> 
> Regards
> Rick Jones 
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