[Bug 106597] [vga_switcheroo] commit 07f4f97d7b4bf325d9f558c5b58230387e4e57e0 breaks dpm on Alienware 15R3

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=106597

--- Comment #19 from Lukas Wunner <lukas@wunner.de> ---
Created attachment 139706
  --> https://bugs.freedesktop.org/attachment.cgi?id=139706&action=edit
drm-next-4.18-wip debug patch 2

Okay at 10.574564, the HDA controller tries to runtime suspend but returns
-EBUSY (-16) because the child HDA codec hdaudioC1D0 is still probing. After
the child is done with probing at 10.586551, it informs the HDA controller that
it may now be idle. However for some reason rpm_idle() doesn't cause the
controller to be suspended.

Here's another debug patch which also litters the ->runtime_idle() path with
debug printks. Please try this and attach the resulting dmesg.


> Well, AFAIK the both the HDMI port and the DP on my laptop are directly attached
> to the dGPU and not to the iGPU like the internal panel is. Maybe it has
> something to do with that?

You've got two HDMI codecs in your machine, hdaudioC1D0 on the AMD GPU and
hdaudioC0D2 in the Intel PCH. It's unclear to me which one is used for external
displays.


> Also, as requested:
> $ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status
> active

My apologies, I meant runtime_enabled, however it does seem to be enabled,
otherwise the idle/suspend machinery wouldn't work. Thanks!

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