A patch of Linux kernel config that made console available again with NVIDIA's proprietary driver. Those changes were made according to https://wiki.gentoo.org/index.php?title=NVIDIA/nvidia-drivers&oldid=798107 . (Note that this is not a minimalistic patch to this end though.)

config-5.0.16-gentoo.patch

--- /boot/config-5.0.16-gentoo-no-console	2019-05-18 12:57:52.000000000 +0900
+++ /boot/config-5.0.16-gentoo	2019-05-18 18:18:10.000000000 +0900
@@ -484,6 +484,7 @@
 CONFIG_ACPI_PROCESSOR_IDLE=y
 CONFIG_ACPI_CPPC_LIB=y
 CONFIG_ACPI_PROCESSOR=y
+# CONFIG_ACPI_IPMI is not set
 CONFIG_ACPI_HOTPLUG_CPU=y
 CONFIG_ACPI_PROCESSOR_AGGREGATOR=m
 CONFIG_ACPI_THERMAL=m
@@ -2517,7 +2518,14 @@
 # CONFIG_SERIAL_FSL_LPUART is not set
 # CONFIG_SERIAL_DEV_BUS is not set
 # CONFIG_TTY_PRINTK is not set
-# CONFIG_IPMI_HANDLER is not set
+CONFIG_IPMI_HANDLER=y
+CONFIG_IPMI_DMI_DECODE=y
+# CONFIG_IPMI_PANIC_EVENT is not set
+# CONFIG_IPMI_DEVICE_INTERFACE is not set
+# CONFIG_IPMI_SI is not set
+# CONFIG_IPMI_SSIF is not set
+# CONFIG_IPMI_WATCHDOG is not set
+# CONFIG_IPMI_POWEROFF is not set
 CONFIG_HW_RANDOM=y
 CONFIG_HW_RANDOM_TIMERIOMEM=m
 CONFIG_HW_RANDOM_INTEL=m
@@ -2558,7 +2566,7 @@
 CONFIG_I2C_MUX_MLXCPLD=m
 CONFIG_I2C_HELPER_AUTO=y
 CONFIG_I2C_SMBUS=m
-CONFIG_I2C_ALGOBIT=y
+CONFIG_I2C_ALGOBIT=m
 CONFIG_I2C_ALGOPCA=m
 
 #
@@ -2803,6 +2811,8 @@
 CONFIG_SENSORS_G760A=m
 CONFIG_SENSORS_G762=m
 CONFIG_SENSORS_HIH6130=m
+# CONFIG_SENSORS_IBMAEM is not set
+# CONFIG_SENSORS_IBMPEX is not set
 CONFIG_SENSORS_I5500=m
 CONFIG_SENSORS_CORETEMP=m
 CONFIG_SENSORS_IT87=m
@@ -3044,7 +3054,6 @@
 # CONFIG_MFD_WM8994 is not set
 # CONFIG_REGULATOR is not set
 CONFIG_CEC_CORE=y
-CONFIG_CEC_NOTIFIER=y
 # CONFIG_RC_CORE is not set
 CONFIG_MEDIA_SUPPORT=y
 
@@ -3160,70 +3169,20 @@
 #
 # Graphics support
 #
-CONFIG_AGP=y
-# CONFIG_AGP_AMD64 is not set
-# CONFIG_AGP_INTEL is not set
-# CONFIG_AGP_SIS is not set
-# CONFIG_AGP_VIA is not set
-# CONFIG_VGA_ARB is not set
+# CONFIG_AGP is not set
+CONFIG_VGA_ARB=y
+CONFIG_VGA_ARB_MAX_GPUS=16
 # CONFIG_VGA_SWITCHEROO is not set
-CONFIG_DRM=y
-CONFIG_DRM_DP_AUX_CHARDEV=y
-# CONFIG_DRM_DEBUG_MM is not set
-# CONFIG_DRM_DEBUG_SELFTEST is not set
-CONFIG_DRM_KMS_HELPER=y
-CONFIG_DRM_KMS_FB_HELPER=y
-CONFIG_DRM_FBDEV_EMULATION=y
-CONFIG_DRM_FBDEV_OVERALLOC=100
-# CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM is not set
-# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set
+# CONFIG_DRM is not set
 CONFIG_DRM_DP_CEC=y
 
 #
-# I2C encoder or helper chips
-#
-CONFIG_DRM_I2C_CH7006=m
-CONFIG_DRM_I2C_SIL164=m
-# CONFIG_DRM_I2C_NXP_TDA998X is not set
-CONFIG_DRM_I2C_NXP_TDA9950=m
-# CONFIG_DRM_RADEON is not set
-# CONFIG_DRM_AMDGPU is not set
-
-#
 # ACP (Audio CoProcessor) Configuration
 #
 
 #
 # AMD Library routines
 #
-# CONFIG_DRM_NOUVEAU is not set
-# CONFIG_DRM_I915 is not set
-# CONFIG_DRM_VGEM is not set
-# CONFIG_DRM_VKMS is not set
-# CONFIG_DRM_VMWGFX is not set
-# CONFIG_DRM_GMA500 is not set
-# CONFIG_DRM_UDL is not set
-# CONFIG_DRM_AST is not set
-# CONFIG_DRM_MGAG200 is not set
-# CONFIG_DRM_CIRRUS_QEMU is not set
-# CONFIG_DRM_QXL is not set
-# CONFIG_DRM_BOCHS is not set
-CONFIG_DRM_PANEL=y
-
-#
-# Display Panels
-#
-CONFIG_DRM_BRIDGE=y
-CONFIG_DRM_PANEL_BRIDGE=y
-
-#
-# Display Interface Bridges
-#
-# CONFIG_DRM_ANALOGIX_ANX78XX is not set
-# CONFIG_DRM_HISI_HIBMC is not set
-# CONFIG_DRM_TINYDRM is not set
-# CONFIG_DRM_LEGACY is not set
-CONFIG_DRM_PANEL_ORIENTATION_QUIRKS=y
 
 #
 # Frame buffer Devices
@@ -3235,12 +3194,7 @@
 CONFIG_FB_CFB_FILLRECT=y
 CONFIG_FB_CFB_COPYAREA=y
 CONFIG_FB_CFB_IMAGEBLIT=y
-CONFIG_FB_SYS_FILLRECT=y
-CONFIG_FB_SYS_COPYAREA=y
-CONFIG_FB_SYS_IMAGEBLIT=y
 # CONFIG_FB_FOREIGN_ENDIAN is not set
-CONFIG_FB_SYS_FOPS=y
-CONFIG_FB_DEFERRED_IO=y
 CONFIG_FB_MODE_HELPERS=y
 # CONFIG_FB_TILEBLITTING is not set
 
@@ -3256,7 +3210,7 @@
 # CONFIG_FB_VGA16 is not set
 # CONFIG_FB_UVESA is not set
 # CONFIG_FB_VESA is not set
-CONFIG_FB_EFI=y
+# CONFIG_FB_EFI is not set
 # CONFIG_FB_N411 is not set
 # CONFIG_FB_HGA is not set
 # CONFIG_FB_OPENCORES is not set
@@ -3288,13 +3242,12 @@
 # CONFIG_FB_VIRTUAL is not set
 # CONFIG_FB_METRONOME is not set
 # CONFIG_FB_MB862XX is not set
-# CONFIG_FB_SIMPLE is not set
+CONFIG_FB_SIMPLE=y
 # CONFIG_FB_SM712 is not set
 CONFIG_BACKLIGHT_LCD_SUPPORT=y
-CONFIG_LCD_CLASS_DEVICE=m
-# CONFIG_LCD_PLATFORM is not set
+# CONFIG_LCD_CLASS_DEVICE is not set
 CONFIG_BACKLIGHT_CLASS_DEVICE=y
-CONFIG_BACKLIGHT_GENERIC=m
+# CONFIG_BACKLIGHT_GENERIC is not set
 # CONFIG_BACKLIGHT_APPLE is not set
 # CONFIG_BACKLIGHT_PM8941_WLED is not set
 # CONFIG_BACKLIGHT_SAHARA is not set
@@ -3305,7 +3258,6 @@
 # CONFIG_BACKLIGHT_LV5207LP is not set
 # CONFIG_BACKLIGHT_BD6107 is not set
 # CONFIG_BACKLIGHT_ARCXCNN is not set
-CONFIG_HDMI=y
 
 #
 # Console display driver support
@@ -3560,7 +3512,6 @@
 CONFIG_HID_PICOLCD=m
 # CONFIG_HID_PICOLCD_FB is not set
 # CONFIG_HID_PICOLCD_BACKLIGHT is not set
-# CONFIG_HID_PICOLCD_LCD is not set
 # CONFIG_HID_PICOLCD_LEDS is not set
 CONFIG_HID_PLANTRONICS=m
 CONFIG_HID_PRIMAX=m