https://bugzilla.kernel.org/show_bug.cgi?id=215419
Bug ID: 215419
Summary: 100 ms regression in boottime before `ACPI: PCI Root
Bridge [PCI0]`
Product: ACPI
Version: 2.5
Kernel Version: 5.15.5
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
On the Intel T4500 laptop Acer TravelMate 5735Z with Debian sid/unstable, there
is a 100 ms introduced between Linux 5.10.46 and 5.14.6, and is still present
in Linux 5.15.5.
### Linux 5.7.6
[ 0.184442] ACPI: Enabled 15 GPEs in block 00 to 3F
[ 0.192301] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
### Linux 5.10.46
[ 0.000000] sitopanaki kernel: Linux version 5.10.0-8-amd64
(debian-ker...@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU
ld (GNU Binutils for Debian) 2.35.2) #1 SMP Debian 5.10.46-4 (2021-08-03)
[ 0.000000] sitopanaki kernel: Command line:
BOOT_IMAGE=/boot/vmlinuz-5.10.0-8-amd64
root=UUID=e17cec4f-d2b8-4cc3-bd39-39a10ed422f4 ro quiet noisapnp
cryptomgr.notests random.trust_cpu=on tsc=unstable
[…]
[ 0.258452] sitopanaki kernel: ACPI: Enabled 15 GPEs in block 00 to 3F
[ 0.266600] sitopanaki kernel: ACPI: PCI Root Bridge [PCI0] (domain 0000
[bus 00-ff])
### Linux 5.14.6 (regression)
[ 0.000000] sitopanaki kernel: Linux version 5.14.0-1-amd64
(debian-ker...@lists.debian.org) (gcc-10 (Debian 10.3.0-10) 10.3.0, GNU ld (GNU
Binutils for Debian) 2.37) #1 SMP Debian 5.14.6-2 (2021-09-19)
[ 0.000000] sitopanaki kernel: Command line:
BOOT_IMAGE=/boot/vmlinuz-5.14.0-1-amd64
root=UUID=e17cec4f-d2b8-4cc3-bd39-39a10ed422f4 ro quiet noisapnp
cryptomgr.notests random.trust_cpu=on tsc=unstable
[ 0.261116] sitopanaki kernel: ACPI: Enabled 15 GPEs in block 00 to 3F
[ 0.378254] sitopanaki kernel: ACPI: PCI Root Bridge [PCI0] (domain 0000
[bus 00-ff])
### Linux 5.15.5 (regression)
[ 0.264773] ACPI: Enabled 15 GPEs in block 00 to 3F
[ 0.377958] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
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