Bug 209073 - RedmiBook 16 does not provide deep (S3) sleep state
Summary: RedmiBook 16 does not provide deep (S3) sleep state
Status: CLOSED DOCUMENTED
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Sleep-Wake (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: acpi_power-sleep-wake
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-08-30 07:55 UTC by Rasmus Moorats
Modified: 2021-01-03 13:29 UTC (History)
2 users (show)

See Also:
Kernel Version: 5.8.5
Subsystem:
Regression: No
Bisected commit-id:

Attachments
ACPI tables (723.98 KB, text/plain)
2020-08-30 07:55 UTC, Rasmus Moorats 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Rasmus Moorats 2020-08-30 07:55:56 UTC 
Created attachment 292221 [details]
ACPI tables

In Linux, S3 sleep state seems to be unavailable for RedmiBook 16.

    $ cat /sys/power/mem_sleep
    [s2idle]

What's strange is that the Kernel seems to detect 3 states when booting.

    $ dmesg | grep "idle state"
    [    0.694581] ACPI: \_SB_.PLTF.C000: Found 3 idle states
    [    0.694859] ACPI: \_SB_.PLTF.C001: Found 3 idle states
    [    0.695178] ACPI: \_SB_.PLTF.C002: Found 3 idle states
    [    0.695355] ACPI: \_SB_.PLTF.C003: Found 3 idle states
    [    0.695509] ACPI: \_SB_.PLTF.C004: Found 3 idle states
    [    0.695658] ACPI: \_SB_.PLTF.C005: Found 3 idle states
    [    0.695809] ACPI: \_SB_.PLTF.C006: Found 3 idle states
    [    0.695959] ACPI: \_SB_.PLTF.C007: Found 3 idle states

Deep sleep seems to work in Windows which seems to suggest it's simply a case of lack of Linux support.

I've attached a dump of this device's ACPI tables and can provide logs and other dumps as needed.
Comment 1 Zhang Rui 2021-01-03 13:29:08 UTC 
(In reply to Rasmus Moorats from comment #0)
> Created attachment 292221 [details]
> ACPI tables
> 
> In Linux, S3 sleep state seems to be unavailable for RedmiBook 16.
> 
>     $ cat /sys/power/mem_sleep
>     [s2idle]

I don't think this is a bug.
It just suggests that S3 is not supported on this platform.

> 
> What's strange is that the Kernel seems to detect 3 states when booting.
> 
>     $ dmesg | grep "idle state"
>     [    0.694581] ACPI: \_SB_.PLTF.C000: Found 3 idle states
>     [    0.694859] ACPI: \_SB_.PLTF.C001: Found 3 idle states
>     [    0.695178] ACPI: \_SB_.PLTF.C002: Found 3 idle states
>     [    0.695355] ACPI: \_SB_.PLTF.C003: Found 3 idle states
>     [    0.695509] ACPI: \_SB_.PLTF.C004: Found 3 idle states
>     [    0.695658] ACPI: \_SB_.PLTF.C005: Found 3 idle states
>     [    0.695809] ACPI: \_SB_.PLTF.C006: Found 3 idle states
>     [    0.695959] ACPI: \_SB_.PLTF.C007: Found 3 idle states
> 
These are CPU cstates, and these messages show there are 3 ACPI Cstate supported, so this is not a bug.

> Deep sleep seems to work in Windows which seems to suggest it's simply a
> case of lack of Linux support.
> 
TBH, I don't think so.
May I know is it 
windows on modern Intel platforms usually uses s0ix as system low power state, and Linux s2idle does the same thing.

Bug closed as I don't see any problem from the description above.
But if there are some issues like high power consumption during system sleep, then that sounds like a real issue and feel free to re-open this bug report.
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