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kernel_config.md

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Kernel config entries required

CONFIG_RTL8723BS=m
CONFIG_AXP288_CHARGER=m
CONFIG_AXP288_FUEL_GAUGE=m
CONFIG_EXTCON_AXP288=m
CONFIG_AXP288_ADC=m
CONFIG_SND_SOC_INTEL_BYT_CHT_ES8316_MACH=m
CONFIG_SND_SOC_ES8316=m
CONFIG_SND_SOC_INTEL_BYTCR_RT5651_MACH=m
CONFIG_SND_SOC_RT5651=m
CONFIG_HDMI_LPE_AUDIO=m
CGROUP_BPF=y
CONFIG_SERIAL_DEV_CTRL_TTYPORT=y

Kernel config entries explained

Make Wifi work (Realtek 8723BS chipset)

Make battery gauge work

  • CONFIG_AXP288_FUEL_GAUGE introduced in kernel 4.1
  • CONFIG_AXP288_CHARGER introduced in kernel 4.2
  • CONFIG_EXTCON_AXP288 introduced in kernel 4.2
  • CONFIG_AXP288_ADC introduced in kernel 3.9
  • Critical bug was fixed in 4.12

Make bytcht-es8316 sound card work (14-inch RDP Thinbook)

  • CONFIG_SND_SOC_INTEL_BYT_CHT_ES8316_MACH introduced in kernel 4.13
  • CONFIG_SND_SOC_ES8316 introduced in kernel 4.13

Make bytcr-rt6551 sound card work (11-inch RDP Thinbook)

  • CONFIG_SND_SOC_RT5651 introduced in kernel 3.16
  • CONFIG_SND_SOC_INTEL_BYTCR_RT5651_MACH introduced in kernel 4.5

HDMI audio without HDaudio on Intel Atom platforms

  • CONFIG_HDMI_LPE_AUDIO introduced in kernel 4.11
  • Note: currently we BLACKLIST this module if pulseaudio version >= 1:10.0-2ubuntu3 because loading this module prevents pulseaudio (version >= 1:10.0-2ubuntu3) from starting in daemon mode

Kernel 4.13.x on Ubuntu 17.10 (Artful Aardvark)

All the above entries are present

However a 1-line patch is required for Bluetooth (rt8723bs_bt) to work properly:

diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
index 76c01cb..4e32def 100644
--- a/net/rfkill/rfkill-gpio.c
+++ b/net/rfkill/rfkill-gpio.c
@@ -163,6 +163,7 @@ static int rfkill_gpio_remove(struct platform_device *pdev)
 static const struct acpi_device_id rfkill_acpi_match[] = {
 	{ "BCM4752", RFKILL_TYPE_GPS },
 	{ "LNV4752", RFKILL_TYPE_GPS },
+     { "OBDA8723",RFKILL_TYPE_BLUETOOTH },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);

Automatic bluetooth configuration in kernel 4.19+

From kernel 4.19 onwards, 1-line patch to rfkill-gpio.c is no longer required. However the following config entry is required to allow kernel to automatically detect and enable Bluetooth RF

CONFIG_SERIAL_DEV_CTRL_TTYPORT=y

systemd v235 BPF bug

The following config entry is recommended to avoid errors like ... egress BPF program ...:

CGROUP_BPF=y

See this issue. This is required until systemd v235 bug fix.