https://bugzilla.kernel.org/show_bug.cgi?id=212643
Bug ID: 212643
Summary: DSDT table not overridden by custom table in initrd
Product: ACPI
Version: 2.5
Kernel Version: 5.12-rc6
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Tables
Assignee: acpi_config-tab...@kernel-bugs.osdl.org
Reporter: zant...@yahoo.de
Regression: Yes
I am using a modified DSDT table via initrd as described in
https://www.kernel.org/doc/Documentation/acpi/initrd_table_override.txt for a
Lenovo Yoga 7i. It worked fine with the stable 5.11.11 kernel, but updating to
5.11.12 broke it and the problem persists in mainline 5.12-rc6. Through
bisection I found that commit 1a1c130ab7575498eed5bcf7220037ae09cd1f8a (ACPI:
tables: x86: Reserve memory occupied by ACPI tables) is responsible for this.
Before this commit, dmesg | grep DSDT:
[ 0.007383] ACPI: DSDT ACPI table found in initrd
[kernel/firmware/acpi/dsdt.aml][0x3ec82]
[ 0.007449] ACPI: Table Upgrade: override [DSDT-LENOVO-CB-01 ]
[ 0.007450] ACPI: DSDT 0x0000000045B94000 Physical table override, new
table: 0x000000004259F000
[ 0.007452] ACPI: DSDT 0x000000004259F000 03EC82 (v02 LENOVO CB-01
00000003 INTL 20210105)
Since then:
[ 0.007162] ACPI: DSDT 0x0000000045B94000 03ED79 (v02 LENOVO CB-01
00000002 ACPI 00040000)
[ 0.007223] ACPI: Reserving DSDT table memory at [mem 0x45b94000-0x45bd2d78]
[ 0.007492] ACPI: DSDT ACPI table found in initrd
[kernel/firmware/acpi/dsdt.aml][0x3ec82]
[ 0.007545] ACPI: Table Upgrade: install [DSDT-LENOVO-CB-01 ]
[ 0.007547] ACPI: DSDT 0x000000004259F000 03EC82 (v02 LENOVO CB-01
00000003 INTL 20210105)
The DSDT table is installed but it does not override the original one. In
/sys/firmware/acpi/tables, I now have files DSDT1 and DSDT2 (one being the
original and the other one the override), where it used to be only one file,
DSDT.
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