We're hiring!
*

Lucid sleep in the free desktop

Tomeu Vizoso avatar

Tomeu Vizoso
May 01, 2015

Share this post:

For the past year I have been working on the kernel side to bring some ChromeOS features to upstream.

One of the areas I'm currently working on is what Google calls Lucid Sleep, which is basically the ability of performing work while the machine is in a low power state such as suspend. I'm writing this blog post because there has been interest on this in different communities and the discussion is currently a bit dispersed.

Small mobile devices have been able to do that since basically always and this feature brings it to bigger devices that traditionally have been either on or off. It's similar to what Microsoft calls InstantGo (previously Connected Standby).
Checking if the battery level is so low that it would be better to completely power down the machineA few examples of tasks that the system could perform while apparently sleeping are:
  • Starting a network backup if the present connectivity allows it (a known access point may have become accessible)
  • Downloading email
  • Checking for new instant messages
With regards to functionality and leaving performance considerations aside, userspace could implement this without requiring any new support in the kernel as illustrated in this scenario:
  • We assume that a video is currently playing in YouTube
  • User closes the lid
  • PM daemon notifies userspace of an impending sleep
  • Browser pauses playback
  • Compositor switches off the screen
  • Kernel freezes userspace, suspends devices and puts the CPUs to idle
  • Time passes...
  • RTC alarm fires off
  • Kernel resumes devices and unfreezes userspace
  • Userspace realizes there hasn't been any user activity since it went to sleep last, so stays in "dark resume" mode
  • Userspace does any lucid tasks it wants, then goes back to sleep again
  • Kernel freezes userspace, suspends devices and puts the CPUs to idle
  • Time passes...
  • User opens lid
  • Kernel resumes devices and unfreezes userspace
  • PM daemon notices the SW_LID event, so notifies userspace that this is a full-on resume
  • Compositor switches screen on
  • Browser resumes playback

No changes needed in the kernel is always good news, but there's two issues.

Lost input events

Sometimes the event from the input device that woke the system up gets lost before it reaches userspace, so we don't know if we can stay dark and do our lucid stuff, or if the user expects the machine to power completely on.

This is in any case a bug, but if it needs to be fixed in the firmware, we may not be able to do much about it. At most we could get the kernel to synthesize an input event, but sometimes it may not have enough information to do so.
 

Performance

When the system wakes up, there tends to be a lot to do in the kernel and userspace, so it could take several seconds for the screen to come up from the moment the user opened the lid in the scenario presented above.

For ChromeOS this isn't acceptable so they are carrying some patches in their kernel that make some shortcuts possible (the screen is left on at suspend time, and the kernel knows at resume time whether it has to power it on based on which was the wakeup source, thus not having to wait for userspace).
 
Fortunately, there have been some changes recently in the kernel PM subsystem that can speed up resumes quite a bit and we can make use of them to offset the penalty of dropping those shortcuts.

The first is idling the CPUs instead of suspending to firmware, which on modern SoCs should be quite efficient and much faster, by a few tenths of seconds.

The other is to leave idle devices that are already in a low power state alone when suspending, which means that we don't have to wait for them to resume when the system wakes up. In every system I have seen there's always a few devices that take a long time to resume, so this can shave several tenths of seconds from the total resume time.

Both need some amount of support in either the platform or in device drivers, and that's what I'm currently working on for the Tegra-based Chromebooks.
 

Related Posts

Related Posts

Comments (0)


Add a Comment






Allowed tags: <b><i><br>Add a new comment:


Search the newsroom

Latest Blog Posts

Adding HEVC/H.265 support for NXP's i.MX 8M

17/02/2021

Our recent efforts on the Hantro kernel driver have resulted in the addition of H.264 decoding support and multiple performance improvements.…

Network adaptive streaming with Hwangsaeul

08/02/2021

Hwangsaeul, or H8L, a remote surveillance streaming solution, utilizes the capability of libsrt to collect statistics from open SRT sockets…

Trimming apitrace workload captures for better Mesa testing

01/02/2021

Complex, real-world correctness tests and performance analysis are now possible thanks to gltrim, a new tool recently added to apitrace,…

GStreamer on Windows: adding WebRTC support to a gst-build install

28/01/2021

Earlier this week, WebRTC became an official W3C and IETF standard. GStreamer has a powerful and rapidly maturing WebRTC implementation.…

Implementing a performance boosting algorithm in Coccinelle

21/01/2021

Last year, from June to September, I worked on the kernel development tool Coccinelle under Collabora. I implemented a performance boosting…

Desktop OpenGL 3.1 on Mali GPUs with Panfrost

13/01/2021

The open source Panfrost driver for Arm Mali Midgard and Bifrost GPUs now provides non-conformant OpenGL ES 3.0 on Bifrost and desktop OpenGL…

Open Since 2005 logo

We use cookies on this website to ensure that you get the best experience. By continuing to use this website you are consenting to the use of these cookies. To find out more please follow this link.

Collabora Ltd © 2005-2021. All rights reserved. Privacy Notice. Sitemap.