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I have a Sony VPCW218AG netbook that I've dual-booted with Ubuntu 10.10. Unlike the preinstalled Windows 7, Ubuntu will not reboot on this computer. Rebooting from Gnome, using the reboot command and SysRq+REISUB all don't work; they end hanging with a blank screen.

I have read that Atom netbooks don't have a keyboard controller and therefore the default reboot method, kbd, won't work. I have actually tried all ten reboot= parameters listed here; none of them work.

I have also tried disabling ACPI with noacpi acpi=off for each one; that didn't help either.

Are there any other things I can try to fix the rebooting problem?

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closed as off topic by James May 22 '12 at 18:58

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Why don't you complete your bug report on launchpad with the requested datas? bug/668274 – Nyamiou The Galeanthrope Nov 30 '10 at 16:41
I'm attaching the files right now. – Delan Azabani Dec 1 '10 at 4:25
All done. Apport tells me to try a mainline/git kernel so I'll try that now. – Delan Azabani Dec 1 '10 at 4:36

Interesting bug. I would try using Alt-SysRq-T to see what tasks seem to be running, then file a bug based on that. It would also be interesting to know whether Alt-SysRq-B reboots it or not.

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up vote 1 down vote accepted

After various experiments, I've reached a solution for this laptop.

I've installed gentoo, compiling a kernel with CONFIG_SONY_LAPTOP and CONFIG_SONYPI_COMPAT enabled. With that driver included, setting reboot=bios on the kernel command line worked (of course, as reboot=bios depends on x86-32, it probably won't work on x86-64 and another solution will be needed). Even though I found this solution in gentoo, it would almost certainly work in Ubuntu too.

After more experimenting, it turns out that the only thing I needed was reboot=bios. However, that doesn't work on x86-64, so I'm stuck with x86-32 (that doesn't matter much though; this netbook only has 1GB of RAM).

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did you also try specifying multiple params? Avoid using the kbd method if the keyboard controller dosen't exists(i actually never encountered this situation, but from old experiences with DOS, accessing invalid controllers may lead to system hangup)..

Are you sure that when the system hangs all other apps are closed? Did you try looking into lastlog?

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