https://bugzilla.kernel.org/show_bug.cgi?id=208595
Bug ID: 208595
Summary: 400 ms spent in power resource detection
Product: ACPI
Version: 2.5
Kernel Version: 5.7.6
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ACPICA-Core
Assignee: acpi_acpica-c...@kernel-bugs.osdl.org
Reporter: pmenzel+bugzilla.kernel....@molgen.mpg.de
Regression: No
Created attachment 290327
--> https://bugzilla.kernel.org/attachment.cgi?id=290327&action=edit
Linux 5.7.6 messages (output of `dmesg`)
On a Dell Precision 3540 with Debian Sid/unstable and Linux 5.7.6, 400 ms are
spent in the ACPI code in the BTPR power resource detection. This is over half
of the time in the Linux kernel before loading the initramfs.
```
[ 0.000000] Linux version 5.7.0-1-amd64 (debian-ker...@lists.debian.org)
(gcc version 9.3.0 (Debian 9.3.0-14), GNU ld (GNU Binutils for Debian) 2.34) #1
SMP Debian 5.7.6-1 (2020-06-24)
[…]
[ 0.000000] DMI: Dell Inc. Precision 3540/0M14W7, BIOS 1.7.4 05/12/2020
[…]
[ 0.313896] ACPI: Enabled 11 GPEs in block 00 to 7F
[ 0.317990] ACPI: Power Resource [PXP] (on)
[ 0.319192] ACPI: Power Resource [PC05] (on)
[ 0.737448] ACPI: Power Resource [BTPR] (off)
[ 0.738335] ACPI: Power Resource [USBC] (on)
[ 0.738431] ACPI: Power Resource [PAUD] (on)
[ 0.740291] ACPI: Power Resource [V0PR] (on)
[ 0.740379] ACPI: Power Resource [V1PR] (on)
[ 0.740463] ACPI: Power Resource [V2PR] (on)
[ 0.743716] ACPI: Power Resource [WRST] (on)
[ 0.753151] ACPI: Power Resource [PIN] (off)
[ 0.753398] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-7e])
[…]
```
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