Bug 217455
| Summary: | kernel consumes ~50% more power at idle after resume from s2ram | ||
|---|---|---|---|
| Product: | Power Management | Reporter: | Alexey Kunitskiy (alexey.kv) |
| Component: | Hibernation/Suspend | Assignee: | Rafael J. Wysocki (rjw) |
| Status: | NEEDINFO --- | ||
| Severity: | normal | CC: | alexey.kv, dsmythies |
| Priority: | P3 | ||
| Hardware: | AMD | ||
| OS: | Linux | ||
| Kernel Version: | Subsystem: | ||
| Regression: | No | Bisected commit-id: | |
| Attachments: |
acpidump / lspci / dmesg logs
Graph of mains power before and after suspend to ram |
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Created attachment 304313 [details]
Graph of mains power before and after suspend to ram
After seeing an email on the linux-pm list about this bug report, and because I have a mains power meter attached to my linux test server, I tried this. I didn't notice any significant difference in the mains power or the processor package power before and after suspend to ram. I used this command:
$ echo mem | sudo tee /sys/power/state
Kernel was 6.4-rc3. Linux distro is Ubuntu 20.04.
(In reply to Doug Smythies from comment #1) > Created attachment 304313 [details] > Graph of mains power before and after suspend to ram > > After seeing an email on the linux-pm list about this bug report, and > because I have a mains power meter attached to my linux test server, I tried > this. I didn't notice any significant difference in the mains power or the > processor package power before and after suspend to ram. I used this command: > You have a whole different HW setup, Doug. (In reply to Alexey Kunitskiy from comment #0) > Your best chance of helping fix this is to perform regression testing: https://docs.kernel.org/admin-guide/bug-bisect.html It will take a lot of effort but no one but you can do it. |
Created attachment 304284 [details] acpidump / lspci / dmesg logs I have a setup for measuring power consumption straight out from AC socket. I'm using following hardware in test setup: ASUS A88X-PLUS motherboard / Athlon X4 845 / 16GB DDR3 1600 a usb sata ssd attached as system disk, no VGA card Tested on Debian bullseye kernel 5.10 , bookworm kernel 6.1 and fresh stable 6.3.2 compiled by myself. Results are the same. All attached logs are from 6.3.2 After a fresh boot, without any interaction such setup consumes ~19W out from power socket. Doing a suspend to ram and after resume power consumption in exact idle use case is increased to 30W and do not come back to value before suspend. I was trying using powertop --auto-tune but it had almost no influence on the increased value.