Bug 77246

Summary:	dual-gpu (vgaswitcheroo) laptop doesn't suspend when lid closed
Product:	systemd	Reporter:	Mirco Tischler <mt-ml>
Component:	general	Assignee:	David Herrmann <dh.herrmann>
Status:	RESOLVED NOTOURBUG	QA Contact:	systemd-bugs
Severity:	normal
Priority:	medium	CC:	mt-ml
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Mirco Tischler 2014-04-09 17:25:58 UTC

I'm seeing the same symptoms on my laptop as in https://bugs.freedesktop.org/show_bug.cgi?id=76267 : closing the lid doesn't suspend while the suspend button does, but, as I understand, the cause is a different one so new bug. Please mark as duplicate if I was wrong ;)

In the logs I see this (with SYSTEMD_LOG_LEVEL=debug for logind):
systemd-logind[4178]: Lid closed.
systemd-logind[4178]: Ignoring lid switch request, 2 displays connected.

However there is only one (the integrated) display.

The laptop has two gpus using vgaswitcheroo, an intel igp and a radeon dedicated gpu, both are working with the free drivers. And both connectors

/sys/class/drm/card0-LVDS-1/status (the igp, actually in use)

and

/sys/class/drm/card1-LVDS-2/status (the radeon gpu, dynamically powered off)

show "connected", so src/login/logind-core.c:manager_count_displays() returns 2.

Is the kernel supposed to advertise two connectors as connected in this case even though there's only one display? If so, what is a better way to recognize the actual number of displays connected?

Thanks
Mirco

Comment 1 David Herrmann 2014-04-14 01:56:04 UTC

There is no way to figure out that both cards have the same hardware assigned. Therefore, systemd thinks it's two different display-controllers. The kernel people need to provide a proper API for us so we can read such information.

The only API available right now is vga-switcheroo, which is in debugfs and unstable. Hence, we cannot use it.

Comment 2 Lennart Poettering 2014-06-23 16:41:31 UTC

Closing for now. Should be posted against the kernel, so that they add a good API for us. If that exists, please file an RFE bug against systemd so that we make use of it.

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