Bug 201597
| Summary: | Hardcoded 1200ms delay in AML for Lenovo Yoga 920 | ||
|---|---|---|---|
| Product: | ACPI | Reporter: | Todd Brandt (todd.e.brandt) |
| Component: | BIOS | Assignee: | acpi_bios |
| Status: | CLOSED DOCUMENTED | ||
| Severity: | normal | CC: | lenb, rui.zhang |
| Priority: | P1 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | 4.19.0 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Bug Depends on: | |||
| Bug Blocks: | 178231 | ||
| Attachments: |
S3 mem timeline from sleepgraph
issue.def |
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This is a BIOS bug, and this bug report is used to keep the record here. Bug closed. Created attachment 282663 [details]
issue.def
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Created attachment 279295 [details] S3 mem timeline from sleepgraph The Lenovo Yoga 920 has a hardcoded delay in its BIOS which shows up in linux suspend/resume. There's a 1200ms delay in the AML for the i2c-WCOM5113:00 device (i2c_hid module). It happens in both suspend_late and resume_early. This effectively makes suspend last 2.4 seconds longer than it has to when running linux.