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CONFIG_THINKPAD_ACPI_HOTKEY_POLL: Support NVRAM polling for hot keys

General informations

The Linux kernel configuration item CONFIG_THINKPAD_ACPI_HOTKEY_POLL has multiple definitions:

Suport NVRAM polling for hot keys found in drivers/misc/Kconfig

The configuration item CONFIG_THINKPAD_ACPI_HOTKEY_POLL:

Help text

Some thinkpad models benefit from NVRAM polling to detect a few of the hot key press events. If you know your ThinkPad model does not need to do NVRAM polling to support any of the hot keys you use, unselecting this option will save about 1kB of memory.

ThinkPads T40 and newer, R52 and newer, and X31 and newer are unlikely to need NVRAM polling in their latest BIOS versions.

NVRAM polling can detect at most the following keys: ThinkPad/Access IBM, Zoom, Switch Display (fn+F7), ThinkLight, Volume up/down/mute, Brightness up/down, Display Expand (fn+F8), Hibernate (fn+F12).

If you are not sure, say Y here. The driver enables polling only if it is strictly necessary to do so.

Support NVRAM polling for hot keys found in drivers/misc/Kconfig

The configuration item CONFIG_THINKPAD_ACPI_HOTKEY_POLL:

Help text

Some thinkpad models benefit from NVRAM polling to detect a few of the hot key press events. If you know your ThinkPad model does not need to do NVRAM polling to support any of the hot keys you use, unselecting this option will save about 1kB of memory.

ThinkPads T40 and newer, R52 and newer, and X31 and newer are unlikely to need NVRAM polling in their latest BIOS versions.

NVRAM polling can detect at most the following keys: ThinkPad/Access IBM, Zoom, Switch Display (fn+F7), ThinkLight, Volume up/down/mute, Brightness up/down, Display Expand (fn+F8), Hibernate (fn+F12).

If you are not sure, say Y here. The driver enables polling only if it is strictly necessary to do so.

Support NVRAM polling for hot keys found in drivers/platform/x86/Kconfig

The configuration item CONFIG_THINKPAD_ACPI_HOTKEY_POLL:

Help text

Some thinkpad models benefit from NVRAM polling to detect a few of the hot key press events. If you know your ThinkPad model does not need to do NVRAM polling to support any of the hot keys you use, unselecting this option will save about 1kB of memory.

ThinkPads T40 and newer, R52 and newer, and X31 and newer are unlikely to need NVRAM polling in their latest BIOS versions.

NVRAM polling can detect at most the following keys: ThinkPad/Access IBM, Zoom, Switch Display (fn+F7), ThinkLight, Volume up/down/mute, Brightness up/down, Display Expand (fn+F8), Hibernate (fn+F12).

If you are not sure, say Y here. The driver enables polling only if it is strictly necessary to do so.

Hardware

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