Hi,

I upgraded by BL3.9/1.1.1 phone to 1.1.4, 5 weeks ago. For the past 2-3 weeks I started noticing intermittent loss of signal on the iphone in office while my neighbour's phones (non iphones) worked absolutely fine with the same service provider. This was in the same areas where the iphone had worked fine previously.

I tried to restore to a clean 1.1.4 about 3-4 times but the problem persisted. I came across a solution on modmyiphone which advised removing the PowerManagement setting files. I didn't try that, but decided to just tweak the power management settings slightly.

I modified the file

/System/Library/SystemConfiguration/PowerManagement.bundle/com.apple.SystemPowerProfileDefaults.plist

and changed the fields 'Reduce Processor Speed' and 'Dynamic Power Step' to 0 from 1.

Then I rebooted the iphone.

Since then, the iphone has been working flawlessly without any instances of loss of signal. Also my 'Usage, from Settings->Usage' is the same as before, indicating no additional drain on battery.

Here is the diff of the changes:

[playground]/home/suman/iphone/xx>$ diff -pu com.apple.SystemPowerProfileDefaults.plist.orig com.apple.SystemPowerProfileDefaults.plist
--- com.apple.SystemPowerProfileDefaults.plist.orig 2008-04-09 17:23:03.000000000 +0530
+++ com.apple.SystemPowerProfileDefaults.plist 2008-04-09 16:20:54.000000000 +0530
@@ -25,7 +25,7 @@
<key>Display Sleep Timer</key>
<integer>5</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -66,7 +66,7 @@
<key>Hibernate Mode</key>
<integer>3</integer>
<key>Reduce Processor Speed</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>System Sleep Timer</key>
<integer>5</integer>
<key>Wake On AC Change</key>
@@ -101,7 +101,7 @@
<key>Hibernate Mode</key>
<integer>3</integer>
<key>Reduce Processor Speed</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>System Sleep Timer</key>
<integer>5</integer>
<key>Wake On AC Change</key>
@@ -132,7 +132,7 @@
<key>Display Sleep Timer</key>
<integer>5</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -167,7 +167,7 @@
<key>Display Sleep Timer</key>
<integer>2</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -208,7 +208,7 @@
<key>Hibernate Mode</key>
<integer>3</integer>
<key>Reduce Processor Speed</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>System Sleep Timer</key>
<integer>10</integer>
<key>Wake On AC Change</key>
@@ -239,7 +239,7 @@
<key>Display Sleep Timer</key>
<integer>10</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -274,7 +274,7 @@
<key>Display Sleep Timer</key>
<integer>5</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -309,7 +309,7 @@
<key>Display Sleep Timer</key>
<integer>5</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -381,7 +381,7 @@
<key>Display Sleep Timer</key>
<integer>10</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
@@ -416,7 +416,7 @@
<key>Display Sleep Timer</key>
<integer>10</integer>
<key>Dynamic Power Step</key>
- <integer>1</integer>
+ <integer>0</integer>
<key>Hibernate File</key>
<string>/var/vm/sleepimage</string>
<key>Hibernate Mode</key>
[playground]/home/suman/iphone/xx>$

I have the same problem at my office , i'll try your fix .

tnx

huh... too complicated for me...

Trying it to fix my wifi problem.

Changing the 0s to 1s doesn't work. I'll try deleting the file.

Also, could you explain me the structure of the file ? Why we have like 5 similare <dict>blablabla</dict> ?

[EDIT] Deleting the file didn't change anything either.

Originally Posted by Moitah

Trying it to fix my wifi problem.

Changing the 0s to 1s doesn't work. I'll try deleting the file.

Also, could you explain me the structure of the file ? Why we have like 5 similare <dict>blablabla</dict> ?

[EDIT] Deleting the file didn't change anything either.

DOn't think this fix was intended for a wifi problem, or am I wrong? I just made the change from 0's to 1's and well see how that works, I'll check back here soon to let you all know.

And for the guy who said it was too complicated....if you know how to ssh into your phone, the rest is as simple as following a path "system/library....etc" Once found the last file which in this case would be the plist, all you do is double click on it and you should then navigate to the areas he mentioned and change the integers from 0 to 1 then hit save at the top of that window.

Hope that helps M8!

Chris

I tried what is mentioned here.

However, there is something that is not completely clear to me:

I did replace the 0s with 1s in the all the fields named "Dynamic Power Step" and "Reduce Processor Speed" but in the explanation it appears that saraf added some additional lines or words instead of just replacing values, as I did.

What I did, it did not work. Any additional suggestion or correction?

Thanks

I did notice those additional command lines but assumed that he was just indicating the corrected line change...guess he'll have to elaborate further....sorry if I misunderstood ya.

CHris

those are outputs from the diff command to show where they are

I tried the above settings and modified the file,But still facing the same problem.Signal is internittent.

Is there any other solution for this.its very frustrating when you have a good phone but of no use as no one can reach me.


Thanks

Originally Posted by letscheckitout

I tried the above settings and modified the file,But still facing the same problem.Signal is internittent.

Is there any other solution for this.its very frustrating when you have a good phone but of no use as no one can reach me.


Thanks

Have you tried reposition your sim card or put a piece of paper behind it?
It worked for me though.