我有一个Dell Precision 7550（Intel Xeon W-10885M8 核，16 线程），最近表现出奇怪的行为。我 在Windows 10和Ubuntu 20.04.4 LTS之间进行了双重启动，并且在 Windows 10 上没有注意到任何问题。最重要的是，我在 Ubuntu 上安装了以下内容：uname -r5.15.0-46-generic
cpufrequtils/focal,now 008-1.1 amd64
cpuid/focal,now 20200211-1 amd64
cpuidtool/focal,now 0.4.1-1.1 amd64
cpuinfo/focal,now 0.0~git20190201.d5e37ad-2 amd64
cpupower-gui/focal,now 0.7.2-2 amd64
indicator-cpufreq/focal,focal,now 0.2.2-0ubuntu3 all
libcpufreq0/focal,now 008-1.1 amd64
libcpuid14/focal,now 0.4.1-1.1 amd64
libcpuinfo0/focal,now 0.0~git20190201.d5e37ad-2 amd64
thermald/focal-updates,now 1.9.1-1ubuntu0.6 amd64
您可以在本文末尾找到正在运行的服务（以及已停用的服务等）的列表。我还没有安装，cpupower因为我似乎无法在公共存储库中找到它。我还没有安装cpufreqd过另外，我已停用，laptop-mode-tools因为我发现它引起了问题。
问题：当我在 Ubuntu 上启动笔记本电脑时，CPU 时钟没有问题，它会根据任务进行调整。但过了一段时间，有点随机，它突然卡在800Mhz（最低设置），我无能为力将其恢复到更高的频率......除了拔掉它的插头以将其放在电池上。一旦我拔掉它，CPU频率就会再次按需调整。如果我再次插入它，它会继续正常工作。起初它看起来完全是随机的，但当我使用 Firefox 或 Chromium 播放 YouTube 视频时，我似乎可以重现该问题。播放视频一段时间后，CPU 会卡在800Mhz。到目前为止，我还没有通过运行 sysbench 等严格的基准测试来重现该问题（但我没有进行很多测试）。
当它发生时/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq保持不变（5300000）并且/sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq也保持不变（800000）。当800Mhz我“手动”将调速器更改为powersave或 时performance，CPU 仍然卡在800Mhz（似乎唯一有效的方法似乎是拔掉它（或重新启动计算机，当然））。正在使用的驱动程序cpufreq是intel_pstate这样解释的这里 powersave对应ondemand（CPU频率调整）同时performance将CPU频率设置为最大。
我尝试卸载thermald，但问题仍然发生，所以它不是来自那里。
BIOS 中的 C 状态已停用，Intel Speedstep 已激活，并且 TurboMode 已启用。同样，当我在 Windows 10 上启动时，一切似乎都工作正常。
更新： 当笔记本电脑使用电池时，该问题似乎不会发生。只有插入电源时才会出现这种情况。但是我尝试使用 2 个不同的 DELL 充电器，两种情况下都会出现这种情况，所以它不依赖于充电器。
此外，最近还对 Linux 内核和 BIOS 进行了更新。我不知道该问题是否与这些更新之一有关。我唯一知道的是这个问题似乎不会发生在 Windows 上。
问题：如何解决问题？哪个进程将我的 CPU 设置为最低设置？我可以做哪些测试来更好地了解正在发生的情况？可能是什么原因造成的？
UNIT LOAD ACTIVE SUB DESCRIPTION
accounts-daemon.service loaded active running Accounts Service
acpid.service loaded active running ACPI event daemon
alsa-restore.service loaded active exited Save/Restore Sound Card State
alsa-state.service loaded inactive dead Manage Sound Card State (restore and store)
anacron.service loaded inactive dead Run anacron jobs
apache2.service loaded active running The Apache HTTP Server
apparmor.service loaded active exited Load AppArmor profiles
apport-autoreport.service loaded inactive dead Process error reports when automatic reporting is enabled
apport.service loaded active exited LSB: automatic crash report generation
apt-daily-upgrade.service loaded inactive dead Daily apt upgrade and clean activities
apt-daily.service loaded inactive dead Daily apt download activities
atd.service loaded active running Deferred execution scheduler
● auditd.service not-found inactive dead auditd.service
avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack
binfmt-support.service loaded active exited Enable support for additional executable binary formats
bluetooth.service loaded active running Bluetooth service
bolt.service loaded active running Thunderbolt system service
clamav-freshclam.service loaded active running ClamAV virus database updater
● cloud-config.service not-found inactive dead cloud-config.service
● cloud-init-local.service not-found inactive dead cloud-init-local.service
colord.service loaded active running Manage, Install and Generate Color Profiles
● connman.service not-found inactive dead connman.service
● console-screen.service not-found inactive dead console-screen.service
console-setup.service loaded active exited Set console font and keymap
cpufrequtils.service loaded active exited LSB: set CPUFreq kernel parameters
cron.service loaded active running Regular background program processing daemon
cups-browsed.service loaded active running Make remote CUPS printers available locally
cups.service loaded active running CUPS Scheduler
dbus.service loaded active running D-Bus System Message Bus
dmesg.service loaded inactive dead Save initial kernel messages after boot
dundee.service loaded active running DUN service
e2scrub_all.service loaded inactive dead Online ext4 Metadata Check for All Filesystems
e2scrub_reap.service loaded inactive dead Remove Stale Online ext4 Metadata Check Snapshots
emergency.service loaded inactive dead Emergency Shell
etc-setserial.service loaded active exited controls configuration of serial ports
● exim4.service not-found inactive dead exim4.service
fam.service loaded active running LSB: File Alteration Monitor
● fancontrol.service masked inactive dead fancontrol.service
fstrim.service loaded inactive dead Discard unused blocks on filesystems from /etc/fstab
● fwupd-refresh.service loaded failed failed Refresh fwupd metadata and update motd
fwupd.service loaded active running Firmware update daemon
gdm.service loaded active running GNOME Display Manager
getty-static.service loaded inactive dead getty on tty2-tty6 if dbus and logind are not available
[email protected] loaded inactive dead Getty on tty1
gpu-manager.service loaded inactive dead Detect the available GPUs and deal with any system changes
grub-common.service loaded inactive dead Record successful boot for GRUB
grub-initrd-fallback.service loaded inactive dead GRUB failed boot detection
hddtemp.service loaded active exited LSB: disk temperature monitoring daemon
hv-fcopy-daemon.service loaded inactive dead Hyper-V File Copy Protocol Daemon
hv-kvp-daemon.service loaded inactive dead Hyper-V KVP Protocol Daemon
hv-vss-daemon.service loaded inactive dead Hyper-V VSS Protocol Daemon
irqbalance.service loaded active running irqbalance daemon
● kbd.service not-found inactive dead kbd.service
kerneloops.service loaded active running Tool to automatically collect and submit kernel crash signatures
keyboard-setup.service loaded active exited Set the console keyboard layout
kmod-static-nodes.service loaded active exited Create list of static device nodes for the current kernel
● laptop-mode.service loaded failed failed Laptop Mode Tools
lm-sensors.service loaded active exited Initialize hardware monitoring sensors
lmt-poll.service loaded inactive dead Laptop Mode Tools - Battery Polling Service
loadcpufreq.service loaded active exited LSB: Load kernel modules needed to enable cpufreq scaling
logrotate.service loaded inactive dead Rotate log files
man-db.service loaded inactive dead Daily man-db regeneration
memcached.service loaded active running memcached daemon
[email protected] loaded inactive dead Load Kernel Module drm
motd-news.service loaded inactive dead Message of the Day
mysql.service loaded active running MySQL Community Server
nas.service loaded active exited LSB: start or stop the Network Audio System.
netplan-ovs-cleanup.service loaded inactive dead OpenVSwitch configuration for cleanup
networkd-dispatcher.service loaded active running Dispatcher daemon for systemd-networkd
● NetworkManager-wait-online.service loaded failed failed Network Manager Wait Online
NetworkManager.service loaded active running Network Manager
ntp-systemd-netif.service loaded inactive dead ntp-systemd-netif.service
ntp.service loaded active running Network Time Service
nvidia-persistenced.service loaded active running NVIDIA Persistence Daemon
● nvidia-powerd.service loaded failed failed nvidia-powerd service
● oem-config.service not-found inactive dead oem-config.service
ofono.service loaded active running Telephony service
ondemand.service loaded inactive dead Set the CPU Frequency Scaling governor
openvpn.service loaded active exited OpenVPN service
● ovsdb-server.service not-found inactive dead ovsdb-server.service
phpsessionclean.service loaded inactive dead Clean php session files
plymouth-quit-wait.service loaded inactive dead Hold until boot process finishes up
plymouth-quit.service loaded inactive dead Terminate Plymouth Boot Screen
plymouth-read-write.service loaded inactive dead Tell Plymouth To Write Out Runtime Data
plymouth-start.service loaded inactive dead Show Plymouth Boot Screen
polkit.service loaded active running Authorization Manager
postfix.service loaded inactive dead Postfix Mail Transport Agent
● [email protected] loaded failed failed Postfix Mail Transport Agent (instance -)
pppd-dns.service loaded inactive dead Restore /etc/resolv.conf if the system crashed before the ppp link was shut down
rc-local.service loaded inactive dead /etc/rc.local Compatibility
rescue.service loaded inactive dead Rescue Shell
resolvconf-pull-resolved.service loaded inactive dead resolvconf-pull-resolved.service
resolvconf.service loaded active exited Nameserver information manager
rpcbind.service loaded active running RPC bind portmap service
rsync.service loaded inactive dead fast remote file copy program daemon
rsyslog.service loaded active running System Logging Service
rtkit-daemon.service loaded active running RealtimeKit Scheduling Policy Service
saslauthd.service loaded active exited LSB: saslauthd startup script
secureboot-db.service loaded inactive dead Secure Boot updates for DB and DBX
● sendmail.service not-found inactive dead sendmail.service
● sep5.service loaded failed failed systemd script to load sep5 driver at boot time
setserial.service loaded active exited controls configuration of serial ports
setvtrgb.service loaded active exited Set console scheme
snapd.apparmor.service loaded active exited Load AppArmor profiles managed internally by snapd
snapd.autoimport.service loaded inactive dead Auto import assertions from block devices
snapd.core-fixup.service loaded inactive dead Automatically repair incorrect owner/permissions on core devices
snapd.failure.service loaded inactive dead Failure handling of the snapd snap
snapd.recovery-chooser-trigger.service loaded inactive dead Wait for the Ubuntu Core chooser trigger
snapd.seeded.service loaded active exited Wait until snapd is fully seeded
snapd.service loaded active running Snap Daemon
snapd.snap-repair.service loaded inactive dead Automatically fetch and run repair assertions
sndiod.service loaded active running sndio audio and MIDI server
● sssd.service not-found inactive dead sssd.service
switcheroo-control.service loaded active running Switcheroo Control Proxy service
systemd-ask-password-console.service loaded inactive dead Dispatch Password Requests to Console
systemd-ask-password-plymouth.service loaded inactive dead Forward Password Requests to Plymouth
systemd-ask-password-wall.service loaded inactive dead Forward Password Requests to Wall
systemd-binfmt.service loaded inactive dead Set Up Additional Binary Formats
systemd-boot-system-token.service loaded inactive dead Store a System Token in an EFI Variable
systemd-fsck-root.service loaded active exited File System Check on Root Device
systemd-fsckd.service loaded inactive dead File System Check Daemon to report status
systemd-hwdb-update.service loaded inactive dead Rebuild Hardware Database
systemd-initctl.service loaded inactive dead initctl Compatibility Daemon
systemd-journal-flush.service loaded active exited Flush Journal to Persistent Storage
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-machine-id-commit.service loaded inactive dead Commit a transient machine-id on disk
systemd-modules-load.service loaded active exited Load Kernel Modules
systemd-networkd.service loaded inactive dead Network Service
systemd-pstore.service loaded inactive dead Platform Persistent Storage Archival
systemd-quotacheck.service loaded inactive dead File System Quota Check
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-remount-fs.service loaded active exited Remount Root and Kernel File Systems
systemd-resolved.service loaded active running Network Name Resolution
systemd-rfkill.service loaded inactive dead Load/Save RF Kill Switch Status
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-sysusers.service loaded active exited Create System Users
● systemd-timesyncd.service masked inactive dead systemd-timesyncd.service
systemd-tmpfiles-clean.service loaded inactive dead Cleanup of Temporary Directories
systemd-tmpfiles-setup-dev.service loaded active exited Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service loaded active exited Create Volatile Files and Directories
systemd-udev-trigger.service loaded active exited udev Coldplug all Devices
systemd-udevd.service loaded active running udev Kernel Device Manager
● systemd-update-done.service not-found inactive dead systemd-update-done.service
systemd-update-utmp-runlevel.service loaded inactive dead Update UTMP about System Runlevel Changes
systemd-update-utmp.service loaded active exited Update UTMP about System Boot/Shutdown
systemd-user-sessions.service loaded active exited Permit User Sessions
● systemd-vconsole-setup.service not-found inactive dead systemd-vconsole-setup.service
thermald.service loaded active running Thermal Daemon Service
timidity.service loaded active exited LSB: start and stop timidity
● tlp.service masked inactive dead tlp.service
● ua-auto-attach.service not-found inactive dead ua-auto-attach.service
ua-reboot-cmds.service loaded inactive dead Ubuntu Advantage reboot cmds
ua-timer.service loaded inactive dead Ubuntu Advantage Timer for running repeated jobs
● ubuntu-advantage-cloud-id-shim.service not-found inactive dead ubuntu-advantage-cloud-id-shim.service
ubuntu-advantage.service loaded inactive dead Ubuntu Advantage GCP Auto Attach Daemon
udisks2.service loaded active running Disk Manager
ufw.service loaded active exited Uncomplicated firewall
unattended-upgrades.service loaded active running Unattended Upgrades Shutdown
upower.service loaded active running Daemon for power management
[email protected] loaded active exited User Runtime Directory /run/user/1000
[email protected] loaded active exited User Runtime Directory /run/user/125
[email protected] loaded active running User Manager for UID 1000
[email protected] loaded active running User Manager for UID 125
uuidd.service loaded inactive dead Daemon for generating UUIDs
● walinuxagent.service not-found inactive dead walinuxagent.service
whoopsie.service loaded active running crash report submission daemon
wpa_supplicant.service loaded active running WPA supplicant
● zfs-mount.service not-found inactive dead zfs-mount.service
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.