linux-kernel - Re: disabling CONFIG_LED

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Date:   Tue, 13 Oct 2020 08:53:00 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Udo van den Heuvel <udovdh@...all.nl>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-leds@...r.kernel.org, Dan Murphy <dmurphy@...com>,
        Pavel Machek <pavel@....cz>
Subject: Re: disabling CONFIG_LED_CLASS

[adding LED people + list]

On 10/13/20 6:24 AM, Udo van den Heuvel wrote:
> 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
>>
> 


-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@...radead.org>