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Published 20 hours ago • verified publisher icon linux-surface

Support for Suspend

Open qzed opened this issue 3 years ago • 2 comments
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Suspend doesn't seem to work properly. Part of it may be #26, but there may be other remaining issues. This should only be an overall tracking issues, specific problems should be handled in their own issue. The device should at least support S2Idle, hopefully we can also support suspend to ram.

qzed avatar Jun 14 '22 20:06 qzed

Suspend seems to work (mostly?) fine when I boot the system fully to ram and disable PCIe in the device tree. There are a couple of USB related errors/warnings, so that might also cause problems (could be "only" higher power draw when suspended).

In essence, this looks like PCIe is the main culprit, causing the observed lock-ups and device reboots (maybe caused by an SError).

qzed avatar Jul 14 '22 15:07 qzed

Adapting https://github.com/steev/linux/commit/9ec798bf7b9239a29eefa66d6cca345926f31cd0 for sc8180x prevents the PCIe suspend problems. There are still some pciehp timeouts and USB PHY power-state warnings as well as an xHC error. Also, the system takes quite a bit to resume. So there are still some kinks to work out.

qzed avatar Aug 05 '22 01:08 qzed