Add to F21 PPC Alpha blocker list

Dan,

I'm a tad confused.  

The primary archs (Intel) have a later build of ModemManager that apparently solves this problem on those platforms.  (See BZ noted under additional info).   

My understanding of why you've moved this from Alpha blocker to the general ppc64 tracking list is that this error is not relevant to ppc64 because of missing dependencies (V8/nodejs), then why is it on the default ppc64 install and started by default?

Peter suggested I remove ModemManager.  I can't do anything for the install boot, but should be able to boot using the mod'd F20 DVD and zap the main file.

Al

(In reply to Al Dunsmuir from comment #2)
> Dan,
> 
> I'm a tad confused.  
> 
> The primary archs (Intel) have a later build of ModemManager that apparently
> solves this problem on those platforms.  (See BZ noted under additional
> info).   

no, primary (x86) also has ModemManager-1.4.0-1.fc21, they shouldn't differ across arches. Is the serial port on Mac managed by a ppc/mac specific module? Maybe there is an option how to ignore these ports in MM.
 
> My understanding of why you've moved this from Alpha blocker to the general
> ppc64 tracking list is that this error is not relevant to ppc64 because of
> missing dependencies (V8/nodejs), then why is it on the default ppc64
> install and started by default?

we won't to block especially Alpha due this problem, G5 is not supported, it's a "best effort" HW, so I have moved this bug under the general PPC tracker and it is not forgotten
 
> Peter suggested I remove ModemManager.  I can't do anything for the install
> boot, but should be able to boot using the mod'd F20 DVD and zap the main
> file.

yes, removing doesn't work for an installation DVD, but does it help in the installed system? If it does, it might be possible to use some workaround during the installation so it won't affect the result

And maybe it's just a matter of adding ttyPZ? into MM code, but I haven't seen MM code yet.

Dan, 

The G5 only has USB ports.  The only way to get a RS-232-style serial port would be to insert a USB-to-serial adapter - perhaps useful in kernel debugging.

Old 32-bit Macs could have optional on-board modem hardware installed, but that's not relevant to ppc64 (or likely to be useful these days).

Al

Dan,

The S390 Rawhide compose started at Mon Oct 27 08:10:03 UTC 2014 had the following update.   

- Initially I thought that it sounded like a good candidate to cherry-pick for
  F21 PPC final (or beta, depending on timing and whether primary arch will
  accept this as a freeze exemption).  

- I just noticed that it is actually a lower version than on F21.  If F21 has 
  a higher NVR, it seems like 1.3.0 and 1.4.0 still have issues with USB modem
  device recognition.

I've updated https://bugzilla.redhat.com/show_bug.cgi?id=1010538 to ask Dan Williams his thoughts on this. 

Thanks,
Al

ModemManager-1.3.0-1.fc22
-------------------------
* Tue Aug 05 2014 Dan Williams <dcbw> - 1.3.0-1
- Update to git development snapshot
- Add IPv6 support for many devices
- Updated blacklist for non-modem USB devices
- Support for more MBIM devices from various manufacturers
- Support for more Huawei devices with network ports
- Add new "unmanaged" GPS location mode
- Many bug fixes for various modems

See https://bugs.freedesktop.org/show_bug.cgi?id=85007 (Modemmanager probes non-modem TTY devices).

I can see plugging a cellular modem into a Fedora system that is intel-based (especially a loptop), but suspect there are very few cases where this package would be relevant to ppc64.   Is it possible to have NetworkManager not include this package  by default on ppc64 (BE/LE) only?

Also see https://bugs.freedesktop.org/show_bug.cgi?id=85007 (probing: better handle devices in the 'pci' subsystem).

The Linux Mint Forum post at http://forums.linuxmint.com/viewtopic.php?f=42&t=101010 (How to disable Modem Manager) is very helpful.  

The service file name is slightly different on Fedora, so you would use:

sudo mv /usr/share/dbus-1/system-services/org.freedesktop.ModemManager1.service /usr/share/dbus-1/system-services/org.freedesktop.ModemManager1.service.disabled

Wouldn't it be possible to disable the USB serial driver by appending rd.driver.blacklist=<foo> on the kernel parameter line? All the hardware drivers seems to be built as modules.

(In reply to Dan Horák from comment #10)
> Wouldn't it be possible to disable the USB serial driver by appending
> rd.driver.blacklist=<foo> on the kernel parameter line? All the hardware
> drivers seems to be built as modules.

or rather rd.driver.blacklist=pmac_zilog - seems I was confused by the USB and forgot the /dev/ttyPZ? ttys are PCI based

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