On 7/2/2016 1:54 AM, Mark Peveto wrote:
The short version of a long story. I've just installed sonar on a dell pc. I've also got it installed on a compaq/hp machine, where the followig problem doesn't exist. On the dell, sudo reboot seems to hang. Sudo shutdown works fine. I've tried sudo shutdown -r now, sudo systemctl reboot, and other options. How, without sighted help, can I find out what's causing this machine to hang when I reboot. What's strange is this...why does it shut down just fine, but not reboot?
I'm not familiar with Sonar, so consider these random guesses. First, have you looked in /var/log/syslog and kern.log? There might be a process not shutting down properly. If you halt the system, all processes are killed and all filesystems are unmounted. A reboot only resets the system, so I suppose it's possible that a process is behaving badly or the kernel can't unmount a filesystem. I see this sometimes with slow USB devices, like if I copy a ton of files to my SD card. A more likely explanation is an ACPI or power management issue. You didn't say how old the machines are, but it could be a BIOS bug. Recent kernels should work around this. Without knowing the age of the machine and the kernel version, I can only guess.
Also, the machine isn't a laptop, right? Laptops usually have power management issues. On Debian, there is a package called acpi-tools. Try installing it if it isn't there or purging it if it's there. I have better luck without it installed. I would bet syslog and kern.log would have clues to your problem. I would check those first. Make note of the time you reboot the machine and look at those files with less. You could try booting a live CD to avoid adding all of the boot messages to the logs. You didn't say if that happens on a live CD, booting from the hard drive, other distros, etc. I''ve noticed most live CDs have strange shutdown problems. You might have to pass a parameter on the kernel command line. Both HP and Dell have issues with Linux.
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