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What should I do when Ubuntu freezes?

I have problem with my Ubuntu 10.04 that installed on Lenovo T420 laptop. it keep freezing randomly and i don't know how to fix it.

when it freeze, it freeze completely and the only way is to hold power button till poweroff then power it back on. dyas it's working fine then suddenly freeze.

can any one please assist me to resolve this problem, my system is 2 years and it's business used.

thanks alot.

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user32065
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  • Do you have a swap partition? Have you tried running a memory test? Also, after the freeze, can you power it down, start it up again, and include the contents of /var/log/dmesg by opening it in a text editor and pasting it on paste.ubuntu.com, then giving a link?(Gave wrong link first time) – nanofarad Aug 03 '12 at 12:44
  • Hello ObsessiveFOSS, thanks for your respond. i don't run the test and i'm going to do it now. i paste the output of dmesg. my system hang between date 2 and 3 of Aug (yesterday) the link is there: http://paste.ubuntu.com/1127052/ i will do the memory test and post back. thanks alot – user32065 Aug 03 '12 at 13:18
  • just to note that, i have a swap partition and it's only 100MB, could this make any problem. my RAM is 4G but i'm using PAE kernel thus i got 3.8G since i'm using x32 not x64. – user32065 Aug 03 '12 at 13:28
  • You'll want 4-6 GB. If you don't have space for a new partition, you can create a swap file. – nanofarad Aug 03 '12 at 13:29
  • this will create new swap space, can i increase my current partition safely without losing data. thanks alot for your help and support. – user32065 Aug 03 '12 at 13:33
  • The method in the link creates a new file. It doesn't change your partitions. – nanofarad Aug 03 '12 at 13:34
  • Thanks alot ObsessiveFOSS, i will post back the Memory test result once done. Again thanks for your help. – user32065 Aug 03 '12 at 13:38
  • Hello, the result to memory test is no error, i already increased the swap disk to 3G. my system is freeze today as well at this time(4 AUG 16:27) but i don't see any log that tell what is cases of this freez, i attached both logs, dmesg and kernel. could you please help me to fix this freezes issue. thanks alot. dmesg [http://paste.ubuntu.com/1129523/] Kernel log [http://paste.ubuntu.com/1129526/] – user32065 Aug 04 '12 at 20:27
  • Your paste links had the wrong syntax: here are the correct links: http://paste.ubuntu.com/1129523/ and http://paste.ubuntu.com/1129526/ – nanofarad Aug 04 '12 at 22:18
  • Hi ObsessiveFOSS, thanks for your correction. do you have any other tips that might help me fix this problem. would be appreciated. – user32065 Aug 04 '12 at 22:38
  • Could any one help me please on this or provide any tips. – user32065 Aug 07 '12 at 13:56
  • I'm sorry, but I don't have much experience in this field, but I will post this question on chat. – nanofarad Aug 07 '12 at 16:15
  • thanks alot ObsessiveFOSS, any help will be so appreciated. really i like this system just need to fix it. – user32065 Aug 10 '12 at 19:18

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