User:Randname/GreatWall QF722

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The GreatWall QF722 is an AArch64 based laptop featuring an ARMv8 based Phytium FT-2000/4-M processor.

This product is not meant for consumer market but government usage, which makes it niche and expensive to get (as brand new).

Pros:

  • More standardized overall hardware architecture compared to other SoC-based ARM Laptops

Cons:

  • Niche and expensive to get on the consumer market
  • Some hardware have no mainline support
  • Barely benefits anything from using an ARM processor (less noise and heat, longer battery life, etc. compared to x86-based laptops)

Hardware

Standard

Device Make/model Status Vendor ID / Product ID Kernel driver(s) Kernel version Notes
CPU Phytium FT-2000/4-M Malfunction N/A N/A 6.12.21-gentoo-dist SCMI based governor having issues, unable to scale CPU frequency; workloads are not properly distributed among cores
GPU AMD RX550X Works 1002:6987:17aa:380e / 03-00 amdgpu 6.12.21-gentoo-dist
NVMe ssd WD Blue SN550 NVMe SSD 256GB Works - nvme 6.12.21-gentoo-dist
WLAN Adapter RTL8821CE 802.11ac PCIe Wireless Network Adapter Works 10ec:c821:1a3b:3043 / 02-80-00 rtw88_8821ce 6.12.21-gentoo-dist
Bluetooth Adapter IMC Networks Bluetooth Radio Works 13d3:3533 / e0-01-01 btusb 6.12.21-gentoo-dist Doesn't work on NeoKylin 5.10 kernel due to linux-firmware issues
USB Controller ASMedia Technology Inc. ASM2142/ASM3142 USB 3.1 Host Controller Works 1b21:2142:1b21:2142 / 0c-03-30 xhci_hcd 6.12.21-gentoo-dist
USB Controller VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller Works 1106:3483:1106:3483 / 0c-03-30 xhci_hcd 6.12.21-gentoo-dist
Fingerprint Sensor PXAT MOH Non-functional 2f0a:0f0d / ff-00-00 - 6.12.21-gentoo-dist No drivers available.
Audio PhyHDA (wrapped Realtek ALC269VC) Undetectable ? - 6.12.21-gentoo-dist No drivers available.
Webcam Shenzhen Kingcome Optoelectronic KNC-172F Works 2b7e:0172 / 0e-01-00 uvcvideo 6.12.21-gentoo-dist
Embedded Controller (EC) - Works - gwnb_power 6.12.21-gentoo-dist Requires out-of-tree kernel module; Sluggish, power status change takes ~30s to be reflected
Keyboard AT Translated Set 2 keyboard Limited ps/2:0001-0001-at-translated-set-2-keyboard ft8042 6.12.21-gentoo-dist Requires out-of-tree kernel module; multimedia keys non-functional.
Trackpad ImPS/2 Wheel Mouse Works ps/2:logitech-0005-imps-2-wheel-mouse ft8042 6.12.21-gentoo-dist Requires out-of-tree kernel module.

Detailed information

root #uname -r
6.12.21-gentoo
root #lscpu
Architecture:             aarch64
  CPU op-mode(s):         32-bit, 64-bit
  Byte Order:             Little Endian
CPU(s):                   4
  On-line CPU(s) list:    0-3
Vendor ID:                Phytium
  BIOS Vendor ID:         PHYTIUM LTD
  Model name:             FTC663
    BIOS Model name:      FT-2000/4-M Greatwall CPU @ 2.2GHz
    BIOS CPU family:      257
    Model:                3
    Thread(s) per core:   1
    Core(s) per socket:   4
    Socket(s):            1
    Stepping:             0x1
    BogoMIPS:             96.00
    Flags:                fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
Caches (sum of all):      
  L1d:                    64 KiB (3 instances)
  L1i:                    96 KiB (3 instances)
  L2:                     2 MiB (2 instances)
  L3:                     4 MiB (1 instance)
NUMA:                     
  NUMA node(s):           1
  NUMA node0 CPU(s):      0-3
Vulnerabilities:          
  Gather data sampling:   Not affected
  Itlb multihit:          Not affected
  L1tf:                   Not affected
  Mds:                    Not affected
  Meltdown:               Mitigation; PTI
  Mmio stale data:        Not affected
  Reg file data sampling: Not affected
  Retbleed:               Not affected
  Spec rstack overflow:   Not affected
  Spec store bypass:      Not affected
  Spectre v1:             Mitigation; __user pointer sanitization
  Spectre v2:             Not affected
  Srbds:                  Not affected
  Tsx async abort:        Not affected
root #lspci -nnk
00:00.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc16]
	Kernel driver in use: pcieport
00:01.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc08]
	Kernel driver in use: pcieport
00:02.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc01]
	Kernel driver in use: pcieport
00:03.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc16]
	Kernel driver in use: pcieport
00:04.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc08]
	Kernel driver in use: pcieport
00:05.0 PCI bridge [0604]: Cadence Design Systems, Inc. Device [17cd:dc01]
	Kernel driver in use: pcieport
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Lexa [Radeon 540X/550X/630 / RX 640 / E9171 MCM] [1002:6987] (rev c0)
	Subsystem: Lenovo Device [17aa:380e]
	Kernel driver in use: amdgpu
	Kernel modules: amdgpu
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X] [1002:aae0]
	Subsystem: Lenovo Device [17aa:aae0]
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
02:00.0 USB controller [0c03]: ASMedia Technology Inc. ASM2142/ASM3142 USB 3.1 Host Controller [1b21:2142]
	Subsystem: ASMedia Technology Inc. ASM2142/ASM3142 USB 3.1 Host Controller [1b21:2142]
	Kernel driver in use: xhci_hcd
04:00.0 USB controller [0c03]: VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller [1106:3483] (rev 01)
	Subsystem: VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller [1106:3483]
	Kernel driver in use: xhci_hcd
05:00.0 Non-Volatile memory controller [0108]: Sandisk Corp SanDisk Ultra 3D / WD PC SN530, IX SN530, Blue SN550 NVMe SSD (DRAM-less) [15b7:5009] (rev 01)
	Subsystem: Sandisk Corp WD Blue SN550 NVMe SSD [15b7:5009]
	Kernel driver in use: nvme
06:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
	Subsystem: AzureWave Device [1a3b:3043]
	Kernel driver in use: rtw_8821ce
	Kernel modules: rtw88_8821ce
root #lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 003 Device 003: ID 2f0a:0f0d PXAT MOH
Bus 003 Device 004: ID 13d3:3533 IMC Networks Bluetooth Radio 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
root #lsusb -vt
/:  Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/2p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
/:  Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/2p, 10000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 003.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/1p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 480M
        ID 2109:3431 VIA Labs, Inc. Hub
        |__ Port 001: Dev 003, If 0, Class=Vendor Specific Class, Driver=[none], 12M
            ID 2f0a:0f0d  
        |__ Port 003: Dev 004, If 0, Class=Wireless, Driver=btusb, 12M
            ID 13d3:3533 IMC Networks 
        |__ Port 003: Dev 004, If 1, Class=Wireless, Driver=btusb, 12M
            ID 13d3:3533 IMC Networks 
/:  Bus 004.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub

Installation

Due to missing specifically tailored PS/2 controller drivers, the built-in keyboard and trackpad won't be functional in Gentoo Minimal Installation Disk and many other LiveCD environments. Either prepare a set of USB keyboard (& mouse for GUI), or use few distros that have this driver built in: openKylin, NeoKylin, or Uniontech UOS.

Firmware

The firmware follows UEFI 2.7 standard. No DeviceTree is used.

Handbook:AMD64/Installation/Bootloader#UEFI systems could be used as a cross reference to set up GRUB.

Kernel

Important
This configuration makes the system work to the extent described in the Hardware section, but probably not the most optimized, either due to poor/misunderstanding of things by the author or for fail-safe considerations.

Very Basics

KERNEL Basic Configurations
Platform selection  --->
	(clear all options.)
Kernel Features  --->
	[*] Multi-core scheduler support
	[*] SMT scheduler support 
		(512) Maximum number of CPUs (2-4096)
	[*] ARM Scalable Vector Extension support
	[*] Core Scheduling for SMT
	[*] Kernel support for 32-bit EL0  --->
		[*]   Enable kuser helpers page for 32-bit applications (NEW)
		[*]   Fix up misaligned multi-word loads and stores in user space
		[*]   Emulate deprecated/obsolete ARMv8 instructions  --->
			[*]   Emulate SWP/SWPB instructions
			[*]   Emulate CP15 Barrier instructions
			[*]   Emulate SETEND instruction
	ARMv8.1 architectural features --->
		[*] Atomic instructions
Boot options  --->
	[*] Enable support for the ARM64 ACPI parking protocol
	[*] UEFI runtime support
	[*] Install compressed image by default
	[*] Enable support for SMBIOS (DMI) tables
Device Drivers  --->
	Generic Driver Options  --->
		-*- Maintain a devtmpfs filesystem to mount at /dev
		[*]   Automount devtmpfs at /dev, after the kernel mounted the rootfs
	[*] PCI support  --->
		PCI controller drivers  --->
			<*> Generic PCI host controller
	NVME Support  --->
		<*> NVM Express block device
		[*] NVMe multipath support
	Firmware Drivers  --->
		[*] ARM Software Delegated Exception Interface (SDEI)
		[*] Export DMI identification via sysfs to userspace
		<M> DMI table support in sysfs
		<M> Arm Firmware Framework for Armv8-A
		[*] ARM PSCI checker
		EFI (Extensible Firmware Interface) Support  --->
			[*] Enable the generic EFI decompressor
			[*] Load custom ACPI SSDT overlay from an EFI variable
	[*] SPI support  --->
		<*>   Cadence SPI controller
	PHY Subsystem  --->
		-*- PHY Core
		<M> Cadence Torrent PHY driver
		<M> Cadence D-PHY Support
		<M> Cadence D-PHY Rx Support
		<M> Cadence Sierra PHY Driver
		<M> Cadence Salvo PHY Driver
File systems  --->
	-*- The Extended 4 (ext4) filesystem
	[*]   Use ext4 for ext2 file systems
	-*-   Ext4 POSIX Access Control Lists
	-*-   Ext4 Security Labels
	<M> FUSE (Filesystem in Userspace) support
	<M>   Character device in Userspace support
	<M>   Virtio Filesystem
		[*]     Virtio Filesystem Direct Host Memory Access support (NEW)
	[*]   FUSE passthrough operations support (NEW)
	DOS/FAT/EXFAT/NT Filesystems  --->
		<*> MSDOS fs support
		<*> VFAT (Windows-95) fs support
		<*> exFAT filesystem support
		{M} NTFS Read-Write file system support
		<M> NTFS file system support
	Pseudo filesystems  --->
	-*- /proc file system support
	-*- Tmpfs virtual memory file system support (former shm fs)
-*- Enable the block layer  --->
	Partition Types  --->
		[*] Advanced partition selection
		[*]   EFI GUID Partition support

Power Management

Note
Battery level and lid control require EC driver, which is out of tree; CPU frequency scaling and governor are provided by ARM SCMI/SCPI, but does not work for reasons currently unknown.
KERNEL Power Management Options
Power management options  --->
	[*] Suspend to RAM and standby
	[ ]   Skip kernel's sys_sync() on suspend to RAM/standby
	[ ] Hibernation (aka 'suspend to disk') 
	[ ] Opportunistic sleep
	[ ] Userspace opportunistic sleep
	[*] User space wakeup sources interface
		(100) Maximum number of user space wakeup sources (0 = no limit) (NEW)
		[*]   Garbage collector for user space wakeup sources (NEW)
	-*- Device power management core functionality
	[*] Energy Model for devices with DVFS (CPUs, GPUs, etc)
[*] ACPI (Advanced Configuration and Power Interface) Support  --->
	[*]   ACPI Firmware Performance Data Table (FPDT) support
	<*>   EC read/write access through /sys/kernel/debug/ec
	<*>   AC Adapter
	<*>   Battery
	<*>   Button
	{M}   Video 
	<*>   Fan 
	<*>   ACPI Time and Alarm (TAD) Device Support
	<*>   Processor
	<*>   Thermal Zone
	[*]   Allow upgrading ACPI tables via initrd
	[*]   PCI slot detection driver
	[*]   Platform Runtime Mechanism Support
	[*]   ACPI PCC Address Space
	[*]   ACPI FFH Address Space
CPU Power Management  --->
	CPU Idle  --->
		-*- CPU idle PM support
		ARM CPU Idle Drivers  --->
			[*] PSCI CPU idle Driver
			[*]   PSCI CPU idle Domain
	CPU Frequency scaling  --->
		[*] CPU Frequency scaling
		[*]   CPU frequency transition statistics
		Default CPUFreq governor (ondemand)  --->
		-*-   'performance' governor
		<*>   'powersave' governor
		<*>   'userspace' governor for userspace frequency scaling
		-*-   'ondemand' cpufreq policy governor 
		<*>   'conservative' cpufreq governor
		[*]   'schedutil' cpufreq policy governor
		*** CPU frequency scaling drivers ***
		< >   Generic DT based cpufreq driver
		[ ]   Generic DT based cpufreq platdev driver
		<*>   SCMI based CPUfreq driver
		<*>   CPUFreq driver based on the ACPI CPPC spec
		[*]     Frequency Invariance support for CPPC cpufreq driver (NEW)
Device Drivers  --->
	Firmware Drivers --->
		ARM System Control and Management Interface Protocol --->
			<*> ARM System Control and Management Interface (SCMI) Message Protocol
			[*] Enable support for SCMI Raw transmission mode
			[*] Allow SCMI Raw mode coexistence with normal SCMI stack
			[*] Enable SCMI communication debug metrics tracking
			SCMI Transport Drivers --->
				<*> SCMI transport base on Mailbox
				<*> SCMI transport base on SMC
				[*] Enable atomic mode support for SCMI SMC transport
				<*> SCMI transport based on OP-TEE service
				< > SCMI transport based on VirtIO
			<*> SCMI system power control driver
		<*> ARM System Control and Power Interface (SCPI) Message Protocol
	-*- Thermal drivers  --->
	[*]   Thermal netlink management
	[*]   Thermal state transition statistics
	[ ]   Thermal subsystem debug support
		(0)   Emergency poweroff delay in milli-seconds 
	[ ]   APIs to parse thermal data out of device tree   
		Default Thermal governor (step_wise)  --->
	[*]   Fair-share thermal governor
	-*-   Step_wise thermal governor
	[*]   Bang Bang thermal governor
	[*]   User_space thermal governor
	[*]   Power allocator thermal governor
	[*]   Generic device cooling support 
	[ ]   Thermal emulation mode support
	<*>   Generic Thermal MMIO driver
	< >   Temperature sensor driver for Maxim MAX77620 PMIC
	PM Domains --->
		<*> SCMI performance domain driver
		<*> SCMI power domain driver
		<*> SCPI power domain driver
	Generic powercap sysfs driver --->
		[*] Idle injection framework
		<*> ARM SCMI Powercap driver

USB Support

KERNEL USB Support
Device Drivers  --->
	[*] HID bus support  --->
	-*-   HID bus core support
	[*]     Battery level reporting for HID devices
	[*]     /dev/hidraw raw HID device support
	<*>     Generic HID driver
	USB HID support  --->
		<*> USB HID transport layer
		[*] PID device support
		[*] /dev/hiddev raw HID device support
		
	[*] USB support  --->
		[*]   PCI based USB host interface
		<M>   USB Mass Storage support
		<M>     USB Attached SCSI
		<*>   xHCI HCD (USB 3.0) support
		<*>   EHCI HCD (USB 2.0) support
		[*]     Root Hub Transaction Translators
		<*>   OHCI HCD (USB 1.1) support
		<M>   USB Type-C Support  --->
			<M>   USB Type-C Port Controller Manager
			<M>     Type-C Port Controller Interface driver
			<M>   USB Type-C Connector System Software Interface driver
			<M>     UCSI ACPI Interface Driver

Keyboard & Trackpad

Note
Besides these options, built-in keyboard and trackpad requires out-of-tree kernel module to function.
KERNEL Keyboard & Trackpad
Device Drivers  --->
		Input device support  --->
			-*- Generic input layer (needed for keyboard, mouse, ...)
			[*]   Keyboards  --->
				<M>   AT keyboard
			[*]   Mice  --->
				<*>   PS/2 mouse
				[*]     Logitech PS/2++ mouse protocol extension
				[*]   Miscellaneous devices  --->
					<M>   Windows-compatible SoC Button Array

WLAN

KERNEL WLAN
-*- Networking support  --->
	-*-   Wireless  --->
		<M>   cfg80211 - wireless configuration API
		[*]     nl80211 testmode command
		[*]     enable powersave by default
		[*]     cfg80211 DebugFS entries
		[*]     support CRDA
		[*]     cfg80211 wireless extensions compatibility
		<M>   Generic IEEE 802.11 Networking Stack (mac80211)
		[*]   Minstrel
			Default rate control algorithm (Minstrel)  --->
		[*]   Enable mac80211 mesh networking support
		[*]   Export mac80211 internals in DebugFS
	<M>   RF switch subsystem support  --->
		[*]   RF switch input support
		<M>   GPIO RFKILL driver
	Device Drivers  --->
		[*] Network device support  --->
			[*]   Network core driver support
			[*]   Wireless LAN  --->
				[*]   Realtek devices
				<M>     Realtek 802.11ac wireless chips support  --->
					<M>   Realtek 8821CE PCI wireless network adapter

Webcam

Note
This step could be easily forgotten by users unfamiliar with this unit, as if the kill switch of the camera is not switched on, the camera will be disconnected from the USB bus and tricking the user into thinking the kernel configuration is problematic / hardware failure.
Tip
A red LED will turn on once the kill switch of the camera has been turned on, no matter if the camera has actually been accessed. This LED is not programmatically controllable.
KERNEL Enable USB Video Class for Webcam
Device Drivers  --->
	<M> Multimedia support  --->
		[*]   Autoselect ancillary drivers (tuners, sensors, i2c, spi, frontends)
		Media device types  --->
			[*] Cameras and video grabbers
		Media drivers  --->
			[*] Media USB Adapters  --->
				<M>   USB Video Class (UVC)
				[*]     UVC input events device support

GPU

Reference to AMDGPU.

Sound

Note
Internal speaker will not work as no driver is available for the built-in sound card.

Reference to ALSA.

Bluetooth

Reference to Bluetooth. The Bluetooth adapter firmware requires sys-kernel/linux-firmware.

Alternative: Using NeoKylin Kernel

Using the kernel and kernel modules from NeoKylin will easily solve CPU governor, keyboard, trackpad, EC, and audio issues, as this device has been certified to be compatible with NeoKylin.

Warning
NeoKylin kernel source code is gatekept from average users. Despite using NeoKylin would improve overall user experience with less hassle, users should carefully consider the pros and cons of doing so: Besides the potential GPL breach, such a closed-source kernel could contain bloated, terribly/surprisingly broken, or thinking in conspiracy ways, malicious features.
Tip
A full installation of NeoKylin will bundle kernel configuration file that used to build the kernel under /boot. This could be used as a startpoint to configure and compile Gentoo kernel, despite this configuration is not well optimized.

Acquire NeoKylin kernel from NeoKylin rootfs, either of a NeoKylin LiveCD or full installation, and copy it into places:

root #cp ${KYLIN_ROOTFS}/vmlinuz-${KERNEL_VERSION}-generic /boot/vmlinuz-${KERNEL_VERSION}-generic
root #cp -r ${KYLIN_ROOTFS}/lib/modules/${KERNEL_VERSION}-generic /lib/modules/${KERNEL_VERSION}-generic

Then rengenrate initramfs and grub configuration:

Note
The following command use dracut and grub for example. If preferring other ways of generating initramfs and/or bootloaders, check out the corresponding articles.
root #dracut --kver ${KERNEL_VERSION}-generic && grub-mkconfig -o /boot/grub/grub.cfg

Optional: reinstalling linux-firmware

sys-kernel/linux-firmware has to be reinstalled without USE flag compress-zstd if formerly enabled, as NeoKylin kernel didn't enable ZSTD-compressed firmware support (till the last edit of this article).

FILE /etc/portage/package.use/linux-firmwareDisabling compress-zstd USE flag
sys-kernel/linux-firmware -compress-zstd
root #emerge -av linux-firmware

Optional: Suppressing Oddball Kernel Messages

NeoKylin kernel may generate oddball kernel messages such as Authorization binary is corrupted, please call xxx-xxx-xxxx for help or denied {execute} for pid 1 comm='systemd' name='/usr/lib/systemd/systemd'... . These are due to missing userland executables for Kysec, a security measure in NeoKylin kernel. These executables aren't actually being blocked from executing, but could be annoying while reading the output of dmesg for debugging purposes.

The kernel parameter security= could be passed to the kernel on boot to disable Kysec to suppress these kernel messages.

Important
Not recommended to add this parameter to GRUB_CMDLINE_LINUX_DEFAULT if multibooting with other kernels/distros as this could accidentally disable security measures in them such as AppArmor.

Emerge

Keyboard & Mouse

Built in keyboard and trackpad require a modded i8042 kernel module called ft8042. This could be acquired from ATZLinux Kernel project, but required patching to compile on Linux kernel 6.12 .

A patched version made by the author of this article could be found at here.

Important
Currently, this poorly patched kernel module would result in IRQ#28 being disabled on boot due to mishandling. This could result in undesired consequences. The author doesn't have enough understanding about kernel programming to solve this issue; your help is much appreciated.
Note
Scroll wheel events generated by double-finger sliding on the touchpad are globally reverted: sliding up sends a scroll wheel down event and vice versa. Some desktop environments would have the option to revert scroll direction again but TUI programs would still be affected.

Embedded Controller (EC)

The EC requires a platform-specific driver gwnb_power to function. This could be acquired from ATZLinux Kernel project.

Sound

Built-in audio is provided by PhyHDA, which is probably wrapped/rebranded/modified Realtek Audio.

The driver for this sound card is out-of-tree, way too broken, and may require extensive effort to adapt to Linux kernel 6.12+.

Linux-firmware

Bluetooth and GPU require sys-kernel/linux-firmware.

root #emerge --ask sys-kernel/linux-firmware

Configuration

Optional: Capping CPU Frequency

As the CPU frequency scaling is not functional, the CPU frequency may be capped in UEFI setup to reduce heat and battery consumption, if no demanding tasks will be performed.

Press Delete on boot to enter UEFI setup.

CODE Capping CPU frequency
Device Manager ->
	CPU Configuration ->
		CPU SPEED <2200MHz>

Optional: Change the CPU governor

NeoKylin kernel is compiled with Performance set as default governor. It could be changed to other governors in order to reduce heat and battery consumption.

Reference to Power management/Processor#Manual governor/driver change and Power management/Guide#Using Laptop Mode Tools.

External resources

Retrieved from "https://wiki.gentoo.org/index.php?title=User:Randname/GreatWall_QF722&oldid=1399051"