Bug#886731: linux-image-4.9.0-4-amd64: DKMS sends system in suspend since linux-image-4.9.0-3-amd64

[Michael Biebl]

Picking up this old bug report...

On Sat, 13 Jan 2018 09:30:24 +0100 Marc-Robin Wendt
<wendt at math.tu-berlin.de> wrote:
> 
> On Fri, 2018-01-12 at 01:12 +0000, Ben Hutchings wrote:
> > On Thu, 2018-01-11 at 12:25 +0100, Marc-Robin Wendt wrote:
> > > Hello Ben and Michael,
> > > 
> > > thanks for taking time. Of course its DPMS. Sorry for the typo.
> > > 
> > > Reproducing the bug turns out, it first appears in linux-image-
> > > 4.9.0-4-
> > > amd64 and now linux-image-4.9.0-5-amd64.
> > > 
> > > When I boot the system from grub with old kernel linux-image-4.9.0-
> > > 3-
> > > amd64 or linux-image-4.9.0-2-amd64, behavior is as expected ok,
> > > means
> > > switching off the monitor doesnt trigger suspend of the system.
> > 
> > So are *you* switching off the monitor?  You mentioned DPMS, which is
> > the way for the display adapter to control the monitor - it doesn't
> > involve any signalling in the other direction.
> > 
> > And is the monitor attached to a VGA or digital port?  If it's a
> > digital port, turning off power to the monitor will look exactly the
> > same as unplugging it...
> > 
> 
> I examined the problem more closely. Lid is closed, because the laptop
> is on the dock. Connection via display port. When I connect via HDMI
> there are no problems with turning on or off the monitor.
> 
> It doesn't matter how the monitor is switched off, manual or
> screensaver or even by command from command line.
> The suspend is actually triggered when you switch the monitor on(!)
> again. I didn't noticed it so far, because it happens instantly, when
> you touch anything keyboard or mouse to wake up the monitor from
> screensaver.
> 
> So, monitor is switched off, system runs, I even could ping it. Wake up
> the monitor will send the system into suspend. Even more strange
> behavior.
> 
> Graphic card, see my first mail. Its a Lenovo T430s, so probably
> NVIDIA
> > > NVS 5200M inside. Monitor is LG 34UM88C-P.
> > 

Are you using the proprietary nvidia driver or noveau?

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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