QMI protocol error (3): 'Internal' when running dms-set-operating-mode

[Dan Williams]

On Tue, 2014-12-30 at 11:37 -0600, Isaac Raway wrote:
> Hello list,
> 
> I have an interesting problem that I have been unable to solve through
> normal troubleshooting efforts. I thought I would post to the QMI list
> to see if anyone has any ideas on what might be happening here.
> 
> I am very interested in debugging this problem at whatever level needed
> to get to the bottom of this and would like to end up with a patch
> submission to improve the situation for anyone else who runs into the
> same problem, either via a better error message or via some sort of fix
> (if needed). I have some experience with C but no driver development
> experience other than building a module or two from source.
> 
> I have a Dell Latitude E7240 with built-in 4G module. We've been able to
> get this module to come online and can interrogate it using qmicli, but
> any attempt to connect or set the operating mode to online fails --
> either via qmicli or NetworkManager+ModemManager.
> 
> One interesting note, this card works perfectly if I boot into Windows
> from a USB drive (Windows was banished from the internal SSD on
> purchase), connect via Dell's "SkyLight" program, then warm-boot back to
> Fedora 20. In that case, the initial power mode read from
> dms-get-operating-mode is "online" rather than "low-power".

This smells like rfkill driver issues.  What do you get for 'rfkill
list' run in a terminal under Linux from cold-boot, and does that change
if you boot windows, then warm-boot to Linux?

The other possibility is firmware incompatibility, if the device you
have requires loading firmware with gobi_loader.  But that's only for
older non-LTE cards usually so I don't think this is too likely.

Dan

> Here is some output of an attempt to set the operating mode:
> 
> iraway at procyon:~$ sudo qmicli -d /dev/cdc-wdm0 --dms-get-operating-mode
> [/dev/cdc-wdm0] Operating mode retrieved: Mode: 'low-power' HW
> restricted: 'no' iraway at procyon:~$ sudo qmicli -d /dev/cdc-wdm0
> --dms-set-operating-mode=online error: couldn't set operating mode: QMI
> protocol error (3): 'Internal'
> 
> Really hoping that someone can help out here, we've been unable to make
> any progress for more than a month of debugging (I'm working with the
> folks at EmperorLinux through which this machine was purchased, and they
> have also been unable to come up with much for this problem so far).
> 
> IJR
> 
> p.s. My apologies if the format or content of my message is not inline
>      with the lists' standards!
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