Hi All,

Apparently this is a well known bug, so I'm surprised not to find any posts on it at LQ.

There were recent (july) upgrades to some wayland packages and to bluez. I recently reinstalled sid.

Now, after login, when the desktop opens I get this error message:

"org.freedesktop.DBus.Error.Spawn.ChildSignaled: Process org.blueman.Mechanism received signal 5

You might not be able to connect to the Bluetooth network via this machine"

Apparently this has been traced to one of two problems. Either recent changes to wayland (1.4.0-1 => 1.5.0-1) and / or to new release of bluez (4.x => 5.x).

(see

https://bugs.archlinux.org/task/40880

and

http://semplice-linux.org/community/...c.php?pid=4461)

The result is that, after stopping and restarting it with blueman, bluetooth can find my phone, and pair with it. Then, when I try to connect to Network Access Point, it connects, but fails to get any IP address.

It seems I have to downgrade packages, but this is not proving so easy. For example, as far as I can see, apt-get cannot find the old libwayland-client0 version 1.4.0-1 in any of the sid or wheezy repos. Downgraded bluez successfully, but was unsure which version to go back to, and this has made no difference so far.

How to proceed?

Thanks in advance,

Andrew.

snapshots.debian.org

thanks, will try tonight.

Andrew.

Hi descendantcommand,
I can get the .deb files easily, and have downloaded libwayland-client0_1.4.0-1.deb and copied into /var/cache/apt/archive, but
apt-get update is not admitting use of snapshot archives, on the basis that the archive is eg 120 days out of date. And it does not see the package that I put in the local apt-get archives.

Were you thinking of using dpkg??? Man page says on downgrades there is no dependency checking. But many many packages depend on (eg) libwayland-client0.

Isn't this dangerous?

Andrew.

You can use dpkg for downloaded .debs

Also, there is a setting for your apt-preferences file (that I can't remember verbatim) to ignore the out-of-date check for snapshots.

Could be ...

Hi descendant_command,

Got it first time, and now posting this with my acer c720chromebook, running debian sid, tethered with bluetooth to the phone's internet connection. To get apt-get to ignore the expired nature of the snapshot archive, I used this command:

sudo apt-get -o Acquire::Check-Valid-Until=false update

Could not find that functionality anywhere in apt preferences documentation.
And then to check that only minimal bad things could happen upon the downgrade, first simulate:

sudo apt-get -s install libwayland-client0=1.4.0-1

As nothing else was about to be removed:

sudo apt-get install libwayland-client0=1.4.0-1

Finally, here is the line from the apt-get sources.list that I used:

deb http://snapshot.debian.org/archive/d...40131T221256Z/ sid main

which should read: ...debian.org/archive/debian/20140131T221256Z/ sid main except the above URL did not show right here.

And bluetooth now good. There are several wayland related packages, but that seems to be the only one that needed to be downgraded.

Thanks for your help.

I shall now try to reboot! Assuming that's good, I'll still wait a few more days before marking this thread solved: To see what else (if anything) has been broken.

Andrew.

This is definitely NOT solved.

On boot, bluetooth not working, but after turn off and turn on with blueman, it works, however I have had to refresh IP address too many times.

Battery monitor freezes. Only works once when start xfce4-powermanager. So need restart every time I look at battery.

Panel freezes occasionally.

AND of real importance, the battery life is not what it used to be before taking the machine to Acer service centre, here in New Delhi. There was a step change in battery capacity as shown by xfce4-powermanager, by ~ -5% of capacity. But the lifetime on battery is only about half of what it was, or less. Either the service centre swapped batteries, or something is radically different in the way the software is now driving this machine.



Andrew.

You're running sid.Sounds like this^^

Had more problems with jessie than sid.

I don't want to be too paranoid about the service centre. I only concluded the problem is real today and just started looking at it. Both cpus are running "performance" 1.4 GHz. I would rather they were set to "on demand". Or fixed at 800.

Is that configurable from xfce? I recall they were set that way before, but cannot find the tool anymore.

Alternatively, what's the console command, and I'll go the man page.

THanks.

cpufreq-set

After testing on an AIRCON train, from delhi to jaipur, it is now clear what's been going on with my battery life.

I had formed ideas about battery life in North India - Dharmshala and Ladakh - 20-25C. After the repair, I had rebuilt the machine in a delhi hotel room at ~40C. Now, with the aircon, the battery full capacity as shown by power-manager, has recovered. Have had the machine on for 6 hours, and showing 29% battery. If I go to Helsinki, the battery capacity will probably exceed specification.

Apologies to Acer. It turns out they not only changed the LCD screen as requested, but also changed the housing (whose flakinng paint had damaged the LCD).

I can live with the battery monitor that freezes. It's almost better this way. To do the reset, I have put a launcher button immediately below the panel battery monitor. One gets to see the last reading, then hit reset and look at the present reading.

Bluetooth is entirely useable. If the panel freezes, it is easy to reset with a desktop launcher.

SOLVED.

And Thanks for the help!!!