[ubuntu-uk] Problem when powering off - suspend light flashing

[Colin Law]

On 16 November 2011 21:03, Barry Titterton
<barry.titterton at mail.adsl4less.com> wrote:
> On Wed, 2011-11-16 at 09:06 +0000, Colin Law wrote:
>> On 15 November 2011 22:09, Steve Fisher <xirconuk at gmail.com> wrote:
>> > Coming out of standby is a major issue on a lot of machines.  Usually a
>> > problem with the video drivers (but not always).  What video card do you
>> > have?  My machine will not come out of standby 90% of the time running FGLRX
>> > radeon drivers, but does on the open source drivers, works as good as gold
>> > on the open source version.
>>
>> I think you have misunderstood the problem, it does not go into
>> standby, nor am I asking it to.  I ask for a normal shutdown, which it
>> does.  After shutting down the shutdown light flashes *as if* it were
>> in standby, but it is not.  The problem is that something (possibly a
>> hardware fault) is causing it to think it is in standby when it is
>> not.
>>
>> Colin
>>
> I had something similar with a desktop after I messed with the ACPI
> options. Has your installation/upgrade to 11.10 introduced some ACPI
> settings without your knowledge?

I don't think it is that, I have not knowingly changed anything.  As
an experiment I booted off a 10.10 live CD (and I did not see this
problem at all back then) and was able to see the problem on shutting
down the live CD session.

In fact I have discovered another symptom which I think confirms that
it must be hardware.  If I leave it disconnected from the mains for a
few hours and then plug it in it immediately enters the fault mode
with the standby light flashing and the power button non-functional.
I have to leave it plugged in for ten or fifteen minutes (presumably
something is warming up) and then if I power cycle it is ok.  I think
it has to be hardware, I suppose the first thing to do is to try and
find an old power supply and swap that over.

Colin