The following error can be observed at boot: [ 3.717920] ACPI Error: No handler for Region [SYSI] (00000000ab9e62c5) [IPMI] (20230628/evregion-130) [ 3.717928] ACPI Error: Region IPMI (ID=7) has no handler (20230628/exfldio-261) [ 3.717936] No Local Variables are initialized for Method [_GHL] [ 3.717938] No Arguments are initialized for method [_GHL] [ 3.717940] ACPI Error: Aborting method \_SB.PMI0._GHL due to previous error (AE_NOT_EXIST) (20230628/psparse-529) [ 3.717949] ACPI Error: Aborting method \_SB.PMI0._PMC due to previous error (AE_NOT_EXIST) (20230628/psparse-529) [ 3.717957] ACPI: \_SB_.PMI0: _PMC evaluation failed: AE_NOT_EXIST On Dell systems several methods of acpi_power_meter access variables in IPMI region [0], so wait until IPMI space handler is installed by acpi_ipmi and also wait until SMI is selected to make the space handler fully functional. [0] https://www.dell.com/support/manuals/en-us/redhat-enterprise-linux-v8.0/rhel8_rn_pub/advanced-configuration-and-power-interface-acpi-error-messages-displayed-in-dmesg?guid=guid-0d5ae482-1977-42cf-b417-3ed5c3f5ee62 Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> --- v3: - Use helper. - Use return value to print warning message. v2: - Use completion instead of request_module(). drivers/hwmon/acpi_power_meter.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c index 703666b95bf4..33fb9626633d 100644 --- a/drivers/hwmon/acpi_power_meter.c +++ b/drivers/hwmon/acpi_power_meter.c @@ -883,6 +883,12 @@ static int acpi_power_meter_add(struct acpi_device *device) strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); device->driver_data = resource; + if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") && + acpi_dev_get_first_match_dev("IPI0001", NULL, -1)) { + if (acpi_wait_for_acpi_ipmi()) + dev_warn(&device->dev, "Waiting for ACPI IPMI timeout"); + } + res = read_capabilities(resource); if (res) goto exit_free; -- 2.34.1
