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fedora 20 random freeze

Fedora 20 will freeze randomly for me, it did not happen before. I'm not sure when exactly did it start. When it freezes the HD light is not turned on, so it's not thrashing. ctrl-alt-f1-f7 don't do anything. I can't SSH to the machine from the network.

/var/log/messages tells me nothing useful after a reboot.

i would like to install back the 3.12 kernel to check if it was caused by a recent kernel update but I'm not sure how. Any hint? Also any hint of what else can I do to troubleshoot the problem?

At first I was convinced it only happens when I'm on battery but now it happened once while I was plugged in, for the first time.

fedora 20 random freeze

Fedora 20 will freeze randomly for me, it did not happen before. I'm not sure when exactly did it start. When it freezes the HD light is not turned on, so it's not thrashing. ctrl-alt-f1-f7 don't do anything. I can't SSH to the machine from the network.

/var/log/messages tells me nothing useful after a reboot.

i would like to install back the 3.12 kernel to check if it was caused by a recent kernel update but I'm not sure how. Any hint? Also any hint of what else can I do to troubleshoot the problem?

At first I was convinced it only happens when I'm on battery but now it happened once while I was plugged in, for the first time.time. I'm also considering reinstalling in case something somehow became corrupted. This is a fedora18 installation that I keep upgrading, I'd probably better off with a clean install now.

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fedora 20 random freeze

Fedora 20 will freeze randomly for me, it did not happen before. I'm not sure when exactly did it start. When it freezes the HD light is not turned on, so it's not thrashing. ctrl-alt-f1-f7 don't do anything. I can't SSH to the machine from the network.

/var/log/messages tells me nothing useful after a reboot.

i would like to install back the 3.12 kernel to check if it was caused by a recent kernel update but I'm not sure how. Any hint? Also any hint of what else can I do to troubleshoot the problem?

At first I was convinced it only happens when I'm on battery but now it happened once while I was plugged in, for the first time. I'm also considering reinstalling in case something somehow became corrupted. This is a fedora18 installation that I keep upgrading, I'd probably better off with a clean install now.