ZeroDivisionError in CPU Frequency Monitor: float division by zero

Thanks for the bug report. Can you edit /usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py and go to line 155. You should see something that begins with:

self.freq_range_per_image = ...

Please insert a new line above it with the following text:

print self.backend.get_phys_max_frequency(), self.backend.get_phys_min_frequency()

Then run avant-window-navigator in a terminal check which numbers it prints.

Please also tell me which CPU you have. You can do this by running in a terminal:

cat /proc/cpuinfo > awn_cpufreq_cpuinfo

Then attach the file awn_cpufreq_cpuinfo that you will find in your home folder to this bug report. (See the link below the comment form)

I did what you ask me to do and here's the result from the terminal :

** (avant-window-navigator:15533): DEBUG: Spawned awn-applet[15551] for "cpufreq.desktop", UID: 1304267871, XID: 16777298

** (awn-applet:15540): WARNING **: Helpers are not available...
Please make sure you have dockmanager package installed.

(awn-applet:15549): GLib-GObject-WARNING **: g_object_newv: construct property "panel-id" for object `AwnTerminalApplet' can't be set twice
ShinySwitcher Message: viewport/compiz detected.. using existing workspace config
** (awn-applet:15549): DEBUG: awn-terminal.vala:80: keybinding:
** (awn-applet:15549): DEBUG: awn-terminal.vala:80: keybinding:
HDDTemp sensors interface: Socket error(111): Connection refused
2000000 --------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/awn/extras/awnlib.py", line 1580, in init_start
    applet_class(applet)
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 132, in __init__
    self.draw_freq_cb()
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 302, in draw_freq_cb
    number = float(self.backend.get_current_frequency() - self.backend.get_phys_min_frequency()) / self.freq_range_per_image
ZeroDivisionError: float division by zero
--------------------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/awn/extras/awnlib.py", line 1233, in callback_wrapper
    callback()
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 302, in draw_freq_cb
    number = float(self.backend.get_current_frequency() - self.backend.get_phys_min_frequency()) / self.freq_range_per_image
ZeroDivisionError: float division by zero

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '11' not present in list
/usr/lib/pymodules/python2.7/awn/extras/awnlib.py:1592: Warning: g_object_unref: assertion `G_IS_OBJECT (object)' failed
  gtk.main()

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '13' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '12' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '1' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '0' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '3' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '2' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '5' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '4' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '7' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '6' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '9' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '8' not present in list

** (cpufreq.py:15551): WARNING **: get_pixbuf_at_size: state '11' not present in list

** (cpufreq.py:15551)...

Hmm, I only see the number 2000000. You have 2 cpus. Assuming you have set the applet to use cpu 0, please try this in a terminal:

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq

If you used cpu 1, you should change cpu0 to cpu1. Executing those 2 lines above should each print a number.

here's the terminal out:

 cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
2000000
 cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
2000000
cat /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_max_freq
2000000
 cat /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_min_freq
2000000

In fact I'd like to notice that I don't have 2 cpu, I only have one physical cpu with 2 core (intel core 2 duo with 3Gh each one) with overclock at 6 * 333.

Yeah, I meant cores when I said cpus. Anyway your cpuinfo_max_freq = cpuinfo_min_freq as I expected. The applet kinda assumes that cpuinfo_max_freq > cpuinfo_min_freq. Don't know why they're the same on your system. Can you do:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

And for the fun (I don't have access to a multi core machine running Linux):

cat /sys/devices/system/cpu/cpu0/cpufreq/related_cpus
cat /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus

Please also do:

uname -r

And:

dmesg | grep centrino

and:

dmesg | grep cpufreq

Btw, have you tried to do cpufreq scaling before (working)?

here's the out:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
2000000

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
conservative ondemand userspace powersave performance

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
2000000

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
2000000

cat /sys/devices/system/cpu/cpu0/cpufreq/related_cpus
0

cat /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus
0

uname -r
2.6.38-8-generic

dmesg | grep centrino
(nothing)
dmesg | grep cpufreq
(nothing)

Btw, have you tried to do cpufreq scaling before (working)?
no, sorry

Thanks for your cooperation. The applet uses the difference between cpuinfo_max_freq and cpuinfo_min_freq to determine which image to display in the Awn dock. If scaling_available_frequencies has only 1 frequency, then scaling is not possible.

I'll fix the applet to fall-back to non-scaling mode (meaning that it just displays the current frequency), but I cannot fix the problem that cpuinfo_max_freq = cpuinfo_min_freq. This may be a bug in Ubuntu, so file a bug at launchpad.net/ubuntu and tell them that on your system with your CPU you get cpuinfo_max_freq = cpuinfo_min_freq = scaling_available_frequencies. Good luck!

Fixed in revision 1529.