On Fri, 2015-05-29 at 20:30 +0100, Nick wrote: > I think I may have gathered a useful clue, though of the kind I was > expecting... > > In order to gather the boot messages immediately before shutdown, that I > don't normally get to see due to the graphics card output turning off > early, I attached to the Linux console via serial, by adding this on the > linux kernel command line: > > console=ttyS0,38400 > > After doing that, for about seven boots, I couldn't reproduce the > original problem. > > I removed that option again for a couple of boot-shutdown cycles, and on > the second one on shutdown it failed to power the machine off again. > > I also tried reinstating the 'quiet' option to the kernel which is there > by default after installing Debian, and shutdown still failed the next time. > > Put the console=ttyS0,38400 back, and the problem *seems* to go away. Good detective work. [...] > For the record at this point, I think it's worth mentioning that my > graphics adapter is: > 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G98 > [GeForce 8400 GS Rev. 2] [10de:06e4] (rev a1) > > and it's being driven with the nouveau graphics driver. Please can you report this upstream as explained here: <http://nouveau.freedesktop.org/wiki/Bugs/>. Ben. -- Ben Hutchings Reality is just a crutch for people who can't handle science fiction.
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