linux-kernel - Re: disabling CONFIG_LED

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Message-ID: <53e698c1-86e4-8b1f-afb0-b8471349e701@xs4all.nl>
Date:   Tue, 13 Oct 2020 15:24:28 +0200
From:   Udo van den Heuvel <udovdh@...all.nl>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: disabling CONFIG_LED_CLASS

L.S.,

Even after removing all LED referneces from .config, a `make oldconfig`
leads to:

*
* LED Support
*
LED Support (NEW_LEDS) [Y/?] (NEW) y
  LED Class Support (LEDS_CLASS) [M/y/?] (NEW) n

Where 'n' is not a valid choice.
So why is this LED thing forced upon us and how do we get rid of it?

Or else please explain how to make this work on a Gigabyte Technology
Co., Ltd. X570 AORUS PRO...

Kind regards,
Udo


On 13-10-2020 11:24, Udo van den Heuvel wrote:
> Hello,
> 
> While looking at the 5.9 kernel config I noticed there is no easy way to
> disable LED support in general.
> There's this NEW_LEDS thing that is not shown, etc.
> So I get:
> 
> # make oldconfig
> scripts/kconfig/conf  --oldconfig Kconfig
> *
> * Restart config...
> *
> *
> * LED Support
> *
> LED Support (NEW_LEDS) [Y/?] (NEW) y
>   LED Class Support (LEDS_CLASS) [M/y/?] (NEW) n
> 
> CONFIG_LEDS_CLASS:
> 
> This option enables the LED sysfs class in /sys/class/leds.  You'll
> need this to do anything useful with LEDs.  If unsure, say N.
> 
> Symbol: LEDS_CLASS [=m]
> Type  : tristate
> Defined at drivers/leds/Kconfig:17
>   Prompt: LED Class Support
>   Depends on: NEW_LEDS [=y]
>   Location:
>     -> Device Drivers
>       -> LED Support (NEW_LEDS [=y])
> Selected by [m]:
>   - SND_HDA_GENERIC [=m] && SOUND [=y] && !UML && SND [=m] && SND_HDA
> [=m] && SND_HDA_GENERIC_LEDS [=y]
> Selected by [n]:
>   - TS5500 [=n] && X86_32 [=n] && MELAN [=n]
>   - ADB_PMU_LED [=n] && MACINTOSH_DRIVERS [=n] && PPC_PMAC && ADB_PMU [=n]
>   - ATH5K [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH [=n]
> && (PCI [=y] || ATH25) && MAC80211 [=n]
>   - ATH9K [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH [=n]
> && MAC80211 [=n] && HAS_DMA [=y]
>   - ATH9K_HTC [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_ATH
> [=n] && USB [=y] && MAC80211 [=n]
>   - CARL9170_LEDS [=n] && NETDEVICES [=y] && WLAN [=n] &&
> WLAN_VENDOR_ATH [=n] && CARL9170 [=n]
>   - BRCMSMAC [=n] && NETDEVICES [=y] && WLAN [=n] &&
> WLAN_VENDOR_BROADCOM [=n] && MAC80211 [=n] && BCMA_POSSIBLE [=y] &&
> BCMA_DRIVER_GPIO [=n]
>   - IWLEGACY [=n] && NETDEVICES [=y] && WLAN [=n] && WLAN_VENDOR_INTEL [=n]
>   - INPUT_WISTRON_BTNS [=n] && !UML && INPUT [=y] && INPUT_MISC [=y] &&
> X86_32 [=n]
>   - SENSORS_APPLESMC [=n] && HWMON [=y] && INPUT [=y] && X86 [=y]
>   - IR_REDRAT3 [=n] && RC_DEVICES [=n] && USB_ARCH_HAS_HCD [=y] &&
> RC_CORE [=n]
>   - IR_WINBOND_CIR [=n] && RC_DEVICES [=n] && (X86 [=y] && PNP [=y] ||
> COMPILE_TEST [=n]) && RC_CORE [=n]
>   - IR_TTUSBIR [=n] && RC_DEVICES [=n] && USB_ARCH_HAS_HCD [=y] &&
> RC_CORE [=n]
>   - BACKLIGHT_ADP8860 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
> [=y] && I2C [=y]
>   - BACKLIGHT_ADP8870 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
> [=y] && I2C [=y]
>   - BACKLIGHT_LM3639 [=n] && HAS_IOMEM [=y] && BACKLIGHT_CLASS_DEVICE
> [=y] && I2C [=y]
>   - SND_USB_TONEPORT [=n] && SOUND [=y] && !UML && SND [=m] && SND_USB
> [=y] && USB [=y]
>   - HID_LENOVO [=n] && INPUT [=y] && HID [=y]
>   - HID_WACOM [=n] && INPUT [=y] && HID [=y] && USB_HID [=m]
>   - HUAWEI_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] &&
> ACPI_BATTERY [=n] && ACPI_WMI [=n] && INPUT [=y]
>   - ACER_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
> && BACKLIGHT_CLASS_DEVICE [=y] && SERIO_I8042 [=y] && INPUT [=y] &&
> (RFKILL [=n] || RFKILL [=n]=n) && ACPI_WMI [=n]
>   - ASUS_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && BACKLIGHT_CLASS_DEVICE [=y] && INPUT [=y] && (RFKILL [=n] ||
> RFKILL [=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
>   - ASUS_WIRELESS [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && INPUT [=y]
>   - ASUS_WMI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI_WMI
> [=n] && ACPI_BATTERY [=n] && INPUT [=y] && HWMON [=y] &&
> BACKLIGHT_CLASS_DEVICE [=y] && (RFKILL [=n] || RFKILL [=n]=n) &&
> HOTPLUG_PCI [=n] && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
>   - EEEPC_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && INPUT [=y] && (RFKILL [=n] || RFKILL [=n]=n) && (ACPI_VIDEO [=n]
> || ACPI_VIDEO [=n]=n) && HOTPLUG_PCI [=n] && BACKLIGHT_CLASS_DEVICE [=y]
>   - DELL_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && DMI
> [=y] && BACKLIGHT_CLASS_DEVICE [=y] && (ACPI_VIDEO [=n] || ACPI_VIDEO
> [=n]=n) && (RFKILL [=n] || RFKILL [=n]=n) && SERIO_I8042 [=y] &&
> DELL_SMBIOS [=n]
>   - FUJITSU_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && INPUT [=y] && BACKLIGHT_CLASS_DEVICE [=y] && (ACPI_VIDEO [=n] ||
> ACPI_VIDEO [=n]=n)
>   - HP_ACCEL [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && INPUT [=y]
> && ACPI [=y] && SERIO_I8042 [=y]
>   - THINKPAD_ACPI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && ACPI_BATTERY [=n] && INPUT [=y] && (RFKILL [=n] || RFKILL
> [=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n) &&
> BACKLIGHT_CLASS_DEVICE [=y]
>   - SAMSUNG_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] &&
> (RFKILL [=n] || RFKILL [=n]=n) && (ACPI_VIDEO [=n] || ACPI_VIDEO [=n]=n)
> && BACKLIGHT_CLASS_DEVICE [=y]
>   - ACPI_TOSHIBA [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && ACPI_WMI [=n] && BACKLIGHT_CLASS_DEVICE [=y] && INPUT [=y] &&
> (SERIO_I8042 [=y] || SERIO_I8042 [=y]=n) && (ACPI_VIDEO [=n] ||
> ACPI_VIDEO [=n]=n) && (RFKILL [=n] || RFKILL [=n]=n) && IIO [=n]
>   - LG_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
> && ACPI_WMI [=n] && INPUT [=y]
>   - SYSTEM76_ACPI [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI [=y]
>   - TOPSTAR_LAPTOP [=n] && X86 [=y] && X86_PLATFORM_DEVICES [=n] && ACPI
> [=y] && INPUT [=y]
> 
> 
> And there is no 'n' option. None of the devices as dependencies (on the
> left) are enabled.
> SND_HDA_GENERIC_LEDS is automagically enabled and disabling it via vi is
> no option.
> So how do I disable this stuff?
> 
> Kind regards,
> Udo
>