default or selected kernelversion does not have config value CONFIG_BACKLIGHT_HP680.
Result is shown for kernelversion 6.0-rc7

HP Jornada 680 Backlight Driver

modulename: hp680_bl.ko
configname: CONFIG_BACKLIGHT_HP680

Linux Kernel Configuration
└─> Device Drivers
└─> Graphics support
└─> Backlight & LCD device support
└─> HP Jornada 680 Backlight Driver

If you have a HP Jornada 680, say y to enable the
backlight driver.

source code: