My 8gb Nano needs daily reset, freezes after 4+ hours of being off.

Hi there,
My 8gb iPod Nano needs to be reset every morning, i.e. it freezes after being turned off for more than a couple of hours. Oddly, after only an hour or two, it'll still work perfectly. I even had this problem when I initially set it up for the first time (last week) - it needed to be reset before ever being used!
1) I ALWAYS disconnect properly (eject in iTunes, wait for the iPod to say it's ok to disconnect - safely disconnected from PC)
2) I've done the 5's multiple times and I've had no luck; the Nano is fully charged as well.
3) I've disabled most services (e.g. Diskeeper, NOD32) and hardware (e.g. TV Tuner), still no luck.
The warranty is out in January 2009, which is only 6 months from now - so I'm guessing it sat on a warehouse rack for quite some time; since limited warranty supposedly covers 1 year.
I redeemed it through Air Miles.
Anyone had a similar problem? Any ideas?
Thanks,
Justin

I should also add:
I'm using Windows Vista Ultimate SP1
Functionality, when on, is perfect.

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☞ Copy a line of text in this window to the Clipboard.
☞ Paste into the window of another application.
☞ Wait for the test to run. It usually takes a few minutes.
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PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec;clear;cd;p=(Software Hardware Memory Diagnostics Power FireWire Thunderbolt USB Fonts SerialATA 4 1000 25 5120 KiB/s 1024 85 \\b%% 20480 1 MB/s 25000 ports ' com.clark.\* \*dropbox \*GoogleDr\* \*k.AutoCAD\* \*k.Maya\* vidinst\* ' DYLD_INSERT_LIBRARIES\ DYLD_LIBRARY_PATH -86 "` route -n get default|awk '/e:/{print $2}' `" 25 N\\/A down up 102400 25600 recvfrom sendto CFBundleIdentifier 25 25 25 1000 MB com.apple.AirPortBaseStationAgent 464843899 51 5120 files );N5=${#p[@]};p[N5]=` networksetup -listnetworkserviceorder|awk ' NR>1 { sub(/^$[0-9]+$ /,"");n=$0;getline;} $NF=="'${p[26]}')" { sub(/.$/,"",$NF);print n;exit;} ' `;f=('\n%s: %s\n' '\n%s\n\n%s\n' '\nRAM details\n%s\n' %s\ %s '%s\n-\t%s\n' );S0() { echo ' { q=$NF+0;$NF="";u=$(NF-1);$(NF-1)="";gsub(/^ +| +$/,"");if(q>='${p[$1]}') printf("%s (UID %s) is using %s '${p[$2]}'",$0,u,q);} ';};s=(' /^ *$|CSConfigDot/d;s/^ */ 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END { if($3~/[0-9]/)print$3;} ' ' BEGIN { L='${p[36]}';} !/^[[:space:]]*(#.*)?$/ { l++;if(l<=L) f=f"\n "$0;} END { F=FILENAME;if(!F) exit;if(!f) f="\n [N/A]";"file -b "F|getline T;if(T!~/^(AS.+ (En.+ )?text$|(Bo|PO).+ sh.+ text ex)/) F=F" ("T")";printf("\nContents of %s\n%s\n",F,f);if(l>L) printf("\n ...and %s more line(s)\n",l-L);} ' ' /^ +[NP].+ =/h;/^( +D.+[{]|[}])/{ g;s/.+= //p;};' 's/0/Off/p' ' END{print NR} ' ' /id: N|te: Y/{i++} END{print i} ' ' / / { print "'"${p[28]}"'";exit;};1;' '/ en/!s/\.//p' ' NR!=13{next};{sub(/[+-M]$/,"",$NF)};'"`S0 39 40`" ' $10~/$L/&&$9!~"localhost" { sub(/.+:/,"",$9);print $1": "$9;} ' '/^ +r/s/.+"(.+)".+/\1/p' 's/(.+\.wdgt)\/(Contents\/)?Info\.plist$/\1/p' 's/^.+\/(.+)\.wdgt$/\1/p' ' /l: /{ /DVD/d;s/.+: //;b0'$'\n'' };/s: /{ /V/d;s/^ */- /;H;};$b0'$'\n'' d;:0'$'\n'' x;/APPLE [^:]+$/d;p;' ' /^find: /d;p;' "`S0 44 45`" );c1=(system_profiler pmset\ -g nvram fdesetup find syslog df vm_stat sar ps sudo\ crontab sudo\ iotop top pkgutil 'PlistBuddy 2>&1 -c "Print' whoami cksum kextstat launchctl sudo\ launchctl crontab 'sudo defaults read' stat lsbom mdfind ' for i in ${p[24]};do ${c1[18]} ${c2[27]} $i;done;' defaults\ read scutil sudo\ dtrace sudo\ profiles sed\ -En awk /S*/*/P*/*/*/C*/*/airport networksetup mdutil sudo\ lsof test );c2=(com.apple.loginwindow\ LoginHook '" /L*/P*/loginw*' '" L*/P*/*loginit*' 'L*/Ca*/com.ap*.Saf*/E*/* -d 1 -name In*t -exec '"${c1[14]}"' :CFBundleDisplayName" {} \;|sort|uniq' '~ $TMPDIR.. \( -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $' '.??* -path .Trash -prune -o -type d -name *.app -print -prune' :${p[35]}\" :Label\" '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' "-f'%N: %l' Desktop L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message Req 'bad |Beac|caug|dead[^bl]|FAIL|fail|GPU |hfs: Ru|inval|jnl:|last value [1-9]|n Cause: -|NVDA$|pagin|proc: t|Roamed|rror|ssert|Thrott|tim(ed? ?|ing )o|WARN' -k Message Rne 'Goog|ksadm|SMC:| VALI|xpma' -o -k Sender fseventsd -k Message Req 'SL' " '-du -n DEV -n EDEV 1 10' 'acrx -o comm,ruid,%cpu' '-t1 10 1' '-f -pfc /var/db/r*/com.apple.*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cgh] ! -name *ag \( -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true $ -execdir stat -f:%Sc:%N -t%F {} \;|sort -t: -k2 |tail -n'${p[38]} '-L {/{S*/,},}L*/Lau* -type f' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' '-L /S*/L*/{C*/Sec*A,E}* {/,}L*/{A*d,Ca*/*/Ex,Co{mpon,reM},Ex,Inter,iTu*/*P,Keyb,Mail/B,Pr*P,Qu*T,Scripti,Sec,Servi,Spo,Widg}* -path \\*s/Resources -prune -o -type f -name Info.plist' '/usr/lib -type f -name *.dylib' `awk "${s[31]}"<<<${p[23]}` "/e*/{auto,{cron,fs}tab,hosts,{[lp],sy}*.conf,pam.d/*,ssh{,d}_config,*.local} {,/usr/local}/etc/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t /S*/L*/Lau*/*t .launchd.conf" list getenv /Library/Preferences/com.apple.alf\ globalstate --proxy '-n get default' -I --dns -getdnsservers\ "${p[N5]}" -getinfo\ "${p[N5]}" -P -m\ / '' -n1 '-R -l1 -n1 -o prt -stats command,uid,prt' '--regexp --only-files --files com.apple.pkg.*|sort|uniq' -kl -l -s\ / '-R -l1 -n1 -o mem -stats command,uid,mem' '+c0 -i4TCP:0-1023' com.apple.dashboard\ layer-gadgets '-d /L*/Mana*/$USER&&echo On' '-app Safari WebKitDNSPrefetchingEnabled' "+c0 -l|awk '{print(\$1,\$3)}'|sort|uniq -c|sort -n|tail -1|awk '{print(\$2,\$3,\$1)}'" );N1=${#c2[@]};for j in {0..9};do c2[N1+j]=SP${p[j]}DataType;done;N2=${#c2[@]};for j in 0 1;do c2[N2+j]="-n ' syscall::'${p[33+j]}':return { @out[execname,uid]=sum(arg0) } tick-10sec { trunc(@out,1);exit(0);} '";done;l=(Restricted\ files Hidden\ apps 'Elapsed time (s)' POST Battery Safari\ extensions Bad\ plists 'High file counts' User Heat System\ load boot\ args FileVault Diagnostic\ reports Log 'Free space (MiB)' 'Swap (MiB)' Activity 'CPU per process' Login\ hook 'I/O per process' Mach\ ports kexts Daemons Agents launchd Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching SATA Descriptors );N3=${#l[@]};for i in 0 1 2;do l[N3+i]=${p[5+i]};done;N4=${#l[@]};for j in 0 1;do l[N4+j]="Current ${p[29+j]}stream data";done;A0() { id -G|grep -qw 80;v[1]=$?;((v[1]==0))&&sudo true;v[2]=$?;v[3]=`date +%s`;clear >&-;date '+Start time: %T %D%n';};for i in 0 1;do eval ' A'$((1+i))'() { v=` eval "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};A'$((3+i))'() { v=` while read i;do [[ "$i" ]]&&eval "${c1[$1]} ${c2[$2]}" \"$i\"|'${c1[30+i]}' "${s[$3]}";done<<<"${v[$4]}" `;[[ "$v" ]];};A'$((5+i))'() { v=` while read i;do '${c1[30+i]}' "${s[$1]}" "$i";done<<<"${v[$2]}" `;[[ "$v" ]];};';done;A7(){ v=$((`date +%s`-v[3]));};B2(){ v[$1]="$v";};for i in 0 1;do eval ' B'$i'() { v=;((v['$((i+1))']==0))||{ v=No;false;};};B'$((3+i))'() { v[$2]=`'${c1[30+i]}' "${s[$3]}"<<<"${v[$1]}"`;} ';done;B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`grep -Fv "${v[$1]}"<<<"$v"`;};C0(){ [[ "$v" ]]&&echo "$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { v=`sed -E "$s"<<<"$v"`&&C1 1 $1;};for i in 1 2;do for j in 0 2 3;do eval D$i$j'(){ A'$i' $1 $2 $3; C'$j' $4;};';done;done;{ A0;D20 0 $((N1+1)) 2;D10 0 $N1 1;B0;C2 27;B0&&! B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;D13 0 $((N1+9)) 59 50;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 35 49 61 51;D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;A2 4 20 21;B7 6;B2 9;A4 14 7 52 9;B2 10;B6 9 10 4;C3 25;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;D13 25 37 32 33;A2 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D13 14 1 48 42;D12 34 43 53 44;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 14 2 48 43;D13 4 5 32 1;D13 4 3 60 5;D12 26 48 49 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D22 4 4 50 0;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-
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13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.
14. This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

ATV Radio freezes after 24 hours of play

Hi-
I have two ATV's at two different locations on different wireless networks. BOTH will freeze after about 24 hours of music playing. ATV must be unplugged to regain RADIO functionality.
Any ideas on a fix?
Thanks,
Mike

I had an ongoing problem with my ATV crashing after several hours of Internet radio until I connected it by Ethernet cable and then the problem disappeared. If yours is connected by wifi, try it by Ethernet cable and see if that solves the problem.

Harddrive might be failing, computer freezes after 1 hour uptime

This happens pretty consistently, and I'm not sure whats happening because when it crashes, I can't find anything in the logs or dmesg output once I restart. When a crash occurs, I always still move my mouse, and anything running on the screen will still be running, I just can't interact with any programs, and shell commands error out with messages like "can't find foo: readonly filesystem" or something to that effect.
Here is some information about my harddrives:
http://pastie.org/7391010
I know that from the above it appears my /dev/sdb drive is having some issues, but the crashing happens even when I unmount all the partitions on that drive. When the crash last occurred, I had a terminal open so I could get some dmesg output:
http://i.imgur.com/4lH7bJP.jpg
Which seems to think that the problem is with /dev/sda?
I did do some package upgrading this last weekend, so here is april's pacman.log file:
http://pastie.org/7392845
I'm not sure where else to look for a relevant log entry because once the computer locks up I can't really do anything meaningful. Any ideas?

hokasch wrote:
This SMART output looks like your Seagate is in pretty bad shape, but SMART attributes don't work pretty well with a lot of drives anyway in my experience. It doesn't seem to get any values on your SSD.
But smartctl shows you this:
==> WARNING: This drive may hang after 5184 hours of power-on time:
http://www.tomshardware.com/news/Crucial-m4-Firmware-BSOD,14544.html
See the following web pages for firmware updates:
http://www.crucial.com/support/firmware.aspx
http://www.micron.com/products/solid-state-storage/client-ssd#software
Power_On_Hours 0x0032 100 100 001 Old_age Always - 5440
Which leads to this:
"Corrects a condition where an incorrect response to a SMART counter will cause the m4 drive to become unresponsive after 5184 hours of Power-on time. The drive will recover after a power cycle, however, this failure will repeat once per hour after reaching this point. The condition will allow the end user to successfully update firmware, and poses no risk to user or system data stored on the drive".
You should make more effort in reading your troubleshooting output
OK, I feel silly. Updated the firmware and now at least my smartctl output isn't displaying any warnings or errors. Thanks

My iMac freezes after 3 hours of no activity

My iMac (3 years old) and running Mavericks since it was released, just started locking up/freezing 4 days ago. The screen will be frozen at the point the issue happens. At this point you can not do anything, the mouse cursor will not move and using any keys on keyboard does not work. I earlier checked my engery savings setting and set both Monitor and HDD activity to never and ensure the HDD Sleep is off. I also change batteries for keyboard and track pad. None of this help. I had a clock running last night on the screen and at the point of the screen locking/freezing, it was about 3 hours after my last activity of use. The only way to get past this is to do the "cold-reboot" of the Mac over the past 4 days. Which is not very good workaround. I do have plenty of available HDD space remaining 1TB and my ram is 16GB. It does not lock or freeze while using the Mac only when there is no activity. Not sure if this helps, but the first night this happen, upon the cold-reboot of the Mac, Timemachine reported error on one of my external HDD indicating it was corrupted and in Read-Only mode and you must Repair it. I verified the external HDD was working properly, but when I ran the repair job, it reported it was unable to repair the drive and needed to be reformatted. I reformatted the drive and it is again being used by Timemachine without any reported issues.

Thanks Drexus - after writing this topic, the freezing/locking started happening sooner than 3 hours like within one hour of no activity (and nothing running on the desktop). I did look at the logs as you suggested but did not see anything that stood out, but did notice the entries continued to be logged even when the machine was frozen. I was going to try the safe mode step and some else recommended to try applejack or monitor warrior, but before I tried either of those, I went back to my last comment about the external HDD where the locking first took place. Even though the reformatted Seagate HDD was working with Timemachine again, I ejected the HDD to see if this made a difference, and so far, my Mac has not locked up again. Still not sure how this would cause the locking/freezing of the iMac, where you need to do a cold-boot to get out of it.

IMac G5 freezing after a day of being on.

Hi all,
Ever since I upgraded to 10.4.9 my Mac has taken to freezing at some point between 24 and 36 hours after being turned on. Initially everything just stops. The clock stops, plus I'm unable to change applications or make any input at all (your regular freeze, or is that a "hang"?). However, if I'm running iTunes streaming radio, this continues. And I can still move the mouse cursor, but only for a while - this too soon freezes.
Other than the 10.4.9 update, there is no difference to the pre-problem state. It happens regardless of whether there are any applications running or not. It can happen at any time of day (though it's always a little over a day from being turned on when it happens), and the crash log (and other logs) reveal nothing. I thought it might be one of the programs that check for updates on a daily basis causing it, but I have changed all those settings to no effect. I have reinstalled the 10.4.9 update as well. I'm now running out of ideas of what could be causing it.
Any ideas anyone?
The annoying thing is, whatever I try I have to wait for two days to see if it's had any effect!
Thanks in advance!
Paul C.
iMac G5 - 20" - 1.8GHz Mac OS X (10.4.9)

Hi all,
Upon further (and very lengthy) investigation, I have discovered exactly what is causing my particular problem.
I use Skype and have a USB phone. It's the Ipevo free-1 USB phone that is causing the problem. When the phone is not plugged in, my iMac has stayed on without problem for over a week. As soon as the phone goes back in and the driver (Free-1 USB Phone 1.0.2.14) is launched, then within a day my iMac freezes.
I haven't yet discovered exactly what's happening to cause the freeze. I suspect it may have something to do with the log. My friend sent me the following link:
http://www.macosxhints.com/article.php?story=20070507065945410
although this refers to different software and different hardware, it describes the same kind of problem.
Paul C.

CS3 Bridge & Photoshop freezing after an hours use.

G5/2.0ghz/dual/3gigRAM/OSX58: When I use CS3 Photoshop and CS3 Bridge at the same time, after about an hours use, Photoshop will freeze with the spinning beachball when I double click one image in Bridge to open it up in Photoshop. Anyone know of any similiar experiences? Lord, I do not want to go through the CS3 reinstallation if I do not have to. Talk about a mindless waste of time. jr

First thing to try when in trouble is refreshing the preferences. Restart
Bridge holding down option key and choose refresh preferences. Set them
again to your wishes and try again.
Also check your free space on your system, less then 10 % free space is
often causing trouble.

My macbook pro keeps freezing after i downloaded a file off of safari. how do i stop it from freezing?

i downloaded some file and now my macbook keeps freezing everytime i go to delete it. now Finder won't even open anymore. what should i do to fix this?

What was the file - file name, type, etc.?
Clinton

Zen Micro's Battery flat after 14 hours of being turned of

Now I'm confused, I fully charged my Zen Micro twice and then turned it off, and overnight the battery is fully drained. This cant be right can it's
I know others have experience the rundown issue, but making it sooo flat that it wont even turn on?
Do you think I have a faulty Zen or Battery?

Check the system info on the player itself and check for the version of firmware you have. It will show up as v .XX.XX Anything older than v .0.03 needs to be updated. A lot of battery draining issues were resolved with this firmware update. Also some people have said that keeping the headphones unplugged keeps power from draining as quickly while the player is off because the amp stays powered up.
If the player drains significantly after these two things I'd contact Creative SUpport about a replacement

Ipod won't start up after a long time being off

Hey guys
well, I have a wierd problem, here it goes my ipod(5th gen video 30 gb) well not start up after it's been off for let's say a day. I know it must have a full charge and it does. The keys do not respond, I usally have to plug it in or sometimes get lucky and by unplugging the headphones and it starts up. Also I am wondering if it's because I have put the hold button on for that long period of time, and yes i do take it off of hold before i start it up.
peace out

um ive never heard of a problem like this but does it stay on after you plug it in? and although u probably know u hold the play button down to turn it on.
hope this helps
-billy

Need to extend the background due to people being off the background

I recently saw a video where a Photoshop guru, using CS5 extended, Due to the lack of a larger background, the photographer found himself having to photograph this 20 people group with 16 of them inside of the background and 4 of them with half of their bodies inside of the background and the other half outside.
This guru showed that with photoshop CS5 extended he could extend the background and add the 4 subjects with ease and with only 2 stroked.
I lost the link and would like to learn how he accomplished that.
What is the easiest way to add the other half of the person on the background?

The background window is always grey. That item describes a bug which (in some release) made it a different grey.

Msi p45 platinum - freezes after power save turns off displays

Just put this computer together, everything is stock, no overclocking. Seems to run fine, played a few hours of modern warfare 2 with no issues.
I noticed It seems to freeze after the monitor gets turned off by the power save mode. I just tested this by setting it to turn off displays after 1 minute of inactivity, waited watched the monitor turn off, then I went to the move the mouse and the screen came back on but the cursor would not move. sometimes the screen will not even come back on.
I have turned the computer on, left the room while it was booting to eat breakfast or take a shower, came back the screen was still on but the computer was frozen. Window 7 login screen was up, but there were some graphic glitches. this has happened a couple of times.
If I manually put the computer to sleep it seems to come back properly.
msi p45 platinum 1.6 bios, optimized defaults loaded
e5200 intel dual core @2.5 ghz, 200FSB 12.5 multiplier
4 x 1gb ddr2 (800mhz, nanya brand)
nvidia gtx 260 (195.63 drivers x64)
win7 ultimate x64
enermax 720w powersupply

I think it might be the video card or power supply. Was building two systems,
second system has identical motherboard, processor and ram,
galaxy gts 250 instead of the evga gtx 260.
antec 430 earthwatts instead of Enermax EIN720AWT 720W Power Supply
Installed from same OS disc and same set of drivers. Second system seems to operate the powersave mode for the monitor correctly. Will have to do some testing switching videocards tonight.

CMS GC, no new cycle is started, full GC after one hour

On several servers we observe Full GC events about twice a day, though we configured ConcMarkSweepGC.
The machines are running HotSpot 64-Bit Server VM 1.6.0 on Linux.
-XX:+UseConcMarkSweepGC
-XX:+CMSIncrementalMode
-XX:+CMSIncrementalPacing
-XX:+UseParNewGC
-XX:+PrintGCTimeStamps
-XX:+PrintGCDetails
There are regular CMS cyclyes, from CMS-initial-mark until CMS-concurrent-reset, but sometimes there is a Full GC.
For example:
*21294.717: [CMS-concurrent-sweep: 14.191/355.020 secs]
21294.717: [CMS-concurrent-reset-start]
21297.370: [CMS-concurrent-reset: 0.098/2.653 secs]
24886.612: [GC 24886.612: [ParNew: 75602K->6908K(76672K), 0.0545010 secs] 4825260K->4759005K(6135488K) icms_dc=0 , 0.0548030 secs]
24890.489: [GC 24890.489: [ParNew: 75068K->7099K(76672K), 0.0486250 secs] 4827165K->4760420K(6135488K) icms_dc=0 , 0.0489270 secs]
24894.024: [GC 24894.024: [ParNew: 75259K->5746K(76672K), 0.0484570 secs] 4828580K->4760784K(6135488K) icms_dc=0 , 0.0487920 secs]
*24894.719: [Full GC (System) 24894.719: [CMS: 4755038K->3184682K(6058816K), 33.2352640 secs] 4769958K->3184682K(6135488K), [CMS Perm : 34379K->34079K(57380K)]
icms_dc=0 , 33.2356150 secs]
24927.955: [GC [1 CMS-initial-mark: 3184682K(6058816K)] 3184687K(6135488K), 0.0032150 secs]
24927.958: [CMS-concurrent-mark-start]
24930.683: [GC 24930.683: [ParNew: 68160K->4298K(76672K), 0.0586990 secs] 3252842K->3188980K(6135488K) icms_dc=0 , 0.0589990 secs]
24934.629: [GC 24934.629: [ParNew: 72458K->7263K(76672K), 0.0363780 secs] 3257140K->3191946K(6135488K) icms_dc=0 , 0.0366640 secs]
24936.186: [GC 24936.186: [ParNew: 75423K->4406K(76672K), 0.0469830 secs] 3260106K->3192445K(6135488K) icms_dc=0 , 0.0472680 secs]
...We don't observe any concurrent mode failures.
My observations so far are:
1. there is no CMS-initial-mark after the previous CMS-concurrent-reset.
2. the time difference between the end of the previous cycle (timestamp of CMS-concurrent-sweep) and the Full GC is always exactly 3600 seconds plus a few milliseconds.
My first suspicion was, that System.gc() is being called somewhere. But I dropped this idea, after I found the 3600 seconds pattern.
Looks as if the Full GC happens as a replacement for a skipped CMS cycle one hour after the previuos cycle.
What could be the cause for this strange behaviour?
Often a new CMS cycle starts immediately after the previous cycle has been finished (I removed the ParNew lines):
24927.955: [GC [1 CMS-initial-mark: 3184682K(6058816K)] 3184687K(6135488K), 0.0032150 secs]
24927.958: [CMS-concurrent-mark-start]
28813.444: [CMS-concurrent-mark: 19.847/3885.486 secs]
28813.444: [CMS-concurrent-preclean-start]
28829.762: [CMS-concurrent-preclean: 0.496/16.318 secs]
28829.762: [CMS-concurrent-abortable-preclean-start]
28829.919: [CMS-concurrent-abortable-preclean: 0.053/0.157 secs]
28829.920: [GC[YG occupancy: 43128 K (76672 K)]28829.920: [Rescan (parallel) , 0.0945560 secs]28830.015: [weak refs processing, 0.0084490 secs] [1 CMS-remark:
4755774K(6058816K)] 4798903K(6135488K), 0.1062900 secs]
28830.027: [CMS-concurrent-sweep-start]
29124.744: [CMS-concurrent-sweep: 9.248/294.717 secs]
29124.744: [CMS-concurrent-reset-start]
29128.108: [CMS-concurrent-reset: 0.099/3.363 secs]
29130.816: [GC [1 CMS-initial-mark: 4359831K(6058816K)] 4400863K(6135488K), 0.1016900 secs]
29130.918: [CMS-concurrent-mark-start]
30558.326: [CMS-concurrent-mark: 16.822/1427.409 secs]
30558.326: [CMS-concurrent-preclean-start]
30683.920: [CMS-concurrent-preclean: 3.595/125.594 secs]
30683.920: [CMS-concurrent-abortable-preclean-start]
30684.076: [CMS-concurrent-abortable-preclean: 0.055/0.155 secs]
30684.076: [GC[YG occupancy: 42428 K (76672 K)]30684.076: [Rescan (parallel) , 0.0966020 secs]30684.173: [weak refs processing, 0.1068570 secs] [1 CMS-remark:
4980317K(6058816K)] 5022746K(6135488K), 0.2184810 secs]
30684.296: [CMS-concurrent-sweep-start]
31095.051: [CMS-concurrent-sweep: 13.242/410.756 secs]
31095.051: [CMS-concurrent-reset-start]
31095.149: [CMS-concurrent-reset: 0.097/0.097 secs]Here we have less than 2 seconds between the two cycles.

The presence of the "(System)" in the full GC line means that that collection was caused by a call to System.gc(). You can try running with "-XX:+DisableExplicitGC" as tschodt suggests, but that may have detrimental effects if something thinks it needs a full collection after an hour.
Are you using something like Java RMI, which needs a collection every once in a while to maintain its distributed garbage collection algorithms. You can change the interval at which RMI calls System.gc(), and you can get it to just start a CMS cycle instead of causing a full compacting collection.

My 8gb Nano needs daily reset, freezes after 4+ hours of being off.

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