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I am running a web server at home using Ubuntu 11.4 (maybe? I can't 100% recall) on an older AMD 2400+ desktop with 1 or 2 GB of RAM. Sorry I can't recall the details 100%.

Anyway, I have a KVM hooked up to a monitor and PS2 keyboard that I use to switch between the server and my iMac (The keyboard is only hooked up so I can switch between the two easily. Many times a week, Pingdom will tell me the server is down and I can't hit the server. When I get home (it rarely happens when I am home), I hit the Ctrl key twice to switch to the server, hit the space bar and everything is now up and running again. I need to look again, but I don't believe there is any power saving features turned on in the BIOS.

Does anyone have any other suggestions of what I may have going on? I have my uncle's website running on it now and I really would like to have a better up-time than 95%

As a note, I do not have any GUI installed so everything has to be done on the console (or through WebMin) and I know my way around, but I am by no means experienced.

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Does anything appear in system logs (files under /var/log)? –  Gilles Nov 22 '11 at 23:34
Any logs I should look at in particular? –  Mike Wills Nov 23 '11 at 4:06
I don't know, look for log entries in any file (probably kern.log, but possibly others) created around the time the computer went to sleep. –  Gilles Nov 23 '11 at 8:28

2 Answers 2

up vote 13 down vote accepted

Add the kernel options acpi=off apm=off to the contents of GRUB_CMDLINE_LINUX_DEFAULT in file /etc/default/grub

Then run sudo update-grub

Finally reboot your computer.

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Nope, I'll try that. –  Mike Wills Nov 22 '11 at 20:10
Well... I made the change. Only time will tell if it works. –  Mike Wills Nov 23 '11 at 4:04
I need to figure out why yet, but the server just "went down" again. –  Mike Wills Nov 23 '11 at 16:31
Those kernel options should have completely disabled automatic power management. Did you rebuild grub with the update-grub command? –  JamesA Nov 23 '11 at 16:35
Nope... I was wondering if there was a step two. :-( –  Mike Wills Nov 23 '11 at 16:58

Add this to the end of your kernel parms in /boot/grub/grub.conf:

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