Needs usb_modeswitch rule for UM175 (Verizon/Alltel 3G Modem)

[Noel J. Bergman]

As noted in Bug 328309, we need a udev rule for the UM175. This is Verizon's current 3G modem (http://shop.verizonwireless.com/?id=Verizon+Wireless+UM175+USB+Modem+USB%20Modem).

My (current, but see below) rule is:

SUBSYSTEM=="usb", ATTR{idProduct}="3b03", ATTR{idVendor}=="106c", RUN+="/usr/local/sbin/usb_modeswitch"

having previously configured /etc/usb_modeswitch. I understand that the new udev code uses modem-modeswitch, but we still need a udev rule to invoke a switcher for this modem. Accordingly, I replaced my rule with:

ATTRS{idVendor}=="106c", ATTRS{idProduct}=="3b03", RUN+="modem-modeswitch -v 0x%s{idVendor} -p 0x%s{idProduct} -t option-zerocd"

but that appears NOT to work (see below).

Perhaps someone should go through the current usb_modeswitch.conf file and generate udev rules for the missing {idVendor,idProduct}-pairs (q.v., http://<email address hidden>/msg08733.html)? And modem-modeswitch should be modified to handle more mode switching strings than the one hardcoded into it, or replaced by the more functional usb_modeswitch.

[Noel J. Bergman (noeljb)]

> [modem-modeswitch] appears to work

Nope. After a clean reboot, I could not get the modem to switch on, regardless of whether udev or I ran the command. It required reverting to usb_modeswitch.

So we not only need a rule, apparently we need a fix/enhancement to modem-modeswitch.

[Noel (noel-redhat-bugs)]

Description of problem:

modem-modeswitch lacks the necessary rules and content to handle many of the modems that need switching. usb_modeswitch is far more complete.

In particular, the current Verizon offering, the UM175, is not supported by modem-modeswitch, either by rule or code. Even if the correct command is executed, the code fails to switch the device to modem mode because it it doesn't use the right string. usb_modeswitch handles it perfectly.

modem-modeswitch has the right idea, but needs to be expanded, or should simply be replaced by usb_modeswitch, since it works.

Version-Release number of selected component (if applicable):

udev-extras-20090226-0.5.20090302git.fc11.x86_64

How reproducible:

Very.

Steps to Reproduce:

Insert the device, and watch with udevadm.

Actual results:

The storage device is recognized, but the modem never switches on, even if you run the command by hand.

Expected results:

The device should switch to modem mode.

[Martin Pitt (pitti)]

Let's try method #4 for those devices:

Does the modem start to work if you disable that udev rule, plug it in, and then call "eject" on the fake CD-ROM drive?

[Noel J. Bergman (noeljb)]

Martin,

> Does the modem start to work if you disable that udev rule, plug it in, and then call "eject" on the fake CD-ROM drive?

No. I tried it for you (several times to be sure). Clean reboot. The storage device is recognized, I can mount it (or not), eject it, no difference. I monitor with udevadm, and nothing enables the modem until I (manually in this case) run usb_modeswitch.

[Martin Pitt (pitti)]

Thanks for testing. Dan Williams says

"2) usb_modeswitch - the common tool to handle the fake CD case.
However, I've found it is *completely* unsuited to distro usage, it's
really meant for the user to configure exactly the modem they want to
eject. First, it isn't out-of-the-box-ready, you need to (a) edit a
config file and uncomment your modem, and (b) write the udev rules
yourself. It doesn't just look for all the modems that it can switch
and then switch all of them, it requires being told explicitly about
every modem to switch. Ugh.

3) modem-modeswitch - my attempt to make stuff Just Work, but I never
had time to really handle it. I'd be happy to kill modem-modeswitch if
usb_modeswitch would get easier to package for distributions.

So yeah, I'm happy with the change, and (2) and (3) can co-exist on the
same system. But I think since I have less attention to pay to
modem-modeswitch than people have to give usb_modeswitch, we probably
want to fix usb_modeswitch and just use that in the shiny distant
future.

So this cannot be fixed out of the box in udev, I'm afraid.

[Josua Dietze (digidietze)]

The recent versions of "usb_modeswitch" have a ready made rule file and - using a wrapper like "sane" - do work without user interaction if the respective device is known.

The UM175 is supported.

[Didier Raboud (odyx)]

IMHO, this bug can be closed as it seems to be fixed by usb-modeswitch-data (which you need to have installed).

[Didier Raboud (odyx)]

Hi all,

the resolution to this bug is to ship a udev that incorporates the upstream commit 4dd9b291354e76f34b0d6d7b5c3b28d03a624418 (post-151).

"modeswitch: morph into tool that only switches Mobile Action cables

 Remove option modeswitching code; use usb_modeswitch already, people."

Cheers,

OdyX

[Martin Pitt (pitti)]

Fixed in usb-modeswitch, wont fix in udev.

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[Dan (dan-redhat-bugs)]

This has already happened upstream; modem-modeswitch has been removed from udev and usb_modeswitch is the way to go.

[asux (ckasux)]

try install hwinfo .and updateing