[Intel-gfx] drm i915 weirdness with /sys/class/drm/card0*/status

[Lennart Poettering]

On Tue, 16.06.15 12:37, Chris Wilson (chris at chris-wilson.co.uk) wrote:

> On Tue, Jun 16, 2015 at 01:17:29PM +0200, Lennart Poettering wrote:
> > On Tue, 16.06.15 10:14, Chris Wilson (chris at chris-wilson.co.uk) wrote:
> > 
> > > The biggest change here is 4.1 stopped forcing the probe from sysfs
> > > precisely because systemd was hitting them so often for illogical
> > > reasons (being docked depends on having the lid open and an
> > > external display connected!). To force the probe, you must do
> > > 	$ echo detect > /sys/class/drm/*/status
> > 
> > The way people "dock" their laptops these days is apparently that
> > they plug in an external keyboard+mouse and a display, close the lid
> > and stash the laptop away somewhere. logind hence counts the displays
> > connected, and if its >= 2 it doesn't suspend the machine even if the
> > lid is closed. Before logind, GNOME implemented the very same
> > logic. It's hence hardly "illogical", it's just how this works...
> 
> Note that a closed lid causes the internal panel to be reported as
> disconnected - it always has (with the exception of a module parameter
> to force otherwise to accommodate broken lid buttons). Using the number
> of connected displays is thus flawed.

Hmm, if I change the algorithm to ignore the eDP and LVDS outputs and
see if any of the others is plugged + enabled should fix this, correct?

Lennart

-- 
Lennart Poettering, Red Hat