我有一台运行 Ubuntu 20.04 的联想 Thinkpad P2。尽管有时电量超过 80%，但电池电量却非常低。因此，我的笔记本电脑会在一两分钟内关机，丢失我的所有工作。
但“有时”，当我在此期间打开 Gnome 中的“电源设置”时，电池百分比会恢复到正常水平。但这并不总是发生。我还从 dconf-editor 将关键电池电量操作设置为“无”。但笔记本电脑仍然会关机。
我尝试使用 Thinkpad 的实用程序校准电池。电池寿命似乎不错。我尝试按照论坛的建议运行“电源校准”工具。我尝试将电池充满电，然后将电池完全耗尽后再充电。但似乎没有任何帮助。
在此之前，我曾经运行过 Ubuntu 18.04，没有出现此问题。升级到 20.04 后似乎出现了此问题。
这些是我在关机时在“journalctl -r”中找到的日志
May 20 10:25:22 nitin systemd-logind[1243]: System is powering down.
May 20 10:25:22 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:22 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:12 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:12 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:10 nitin systemd[2412]: Started Application launched by gnome-shell.
May 20 10:25:08 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:08 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:07 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:07 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:25:07 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:25:02 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:02 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:02 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:02 nitin kernel: Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
May 20 10:25:01 nitin CRON[9033]: pam_unix(cron:session): session closed for user root
May 20 10:25:01 nitin CRON[9034]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
May 20 10:25:01 nitin CRON[9033]: pam_unix(cron:session): session opened for user root by (uid=0)
May 20 10:23:49 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:23:49 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:23:49 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
May 20 10:23:49 nitin gnome-shell[2688]: cr_parser_new_from_buf: assertion 'a_buf && a_len' failed
May 20 10:23:49 nitin gnome-shell[2688]: cr_declaration_parse_list_from_buf: assertion 'parser' failed
本论坛提供的解决方案似乎都无济于事。如有任何帮助，不胜感激！
~
编辑1：
我最近注意到，当电池电量不足通知弹出时，我会继续锁定屏幕。然后几秒钟后，当我解锁屏幕时，电池电量会恢复到实际百分比。这至少可以帮助我解决不丢失工作的问题。
我觉得 gnome-shell 不知怎么报告了错误的电池读数。然后当我锁定和解锁屏幕时，gnome-shell 不知怎么重新加载了正确的电池状态。
编辑2：
我确实看到“upower”返回了错误的电池容量。从“更新”的时间戳中可以看出，电池百分比下降到了 3%。然后，在我锁定并解锁屏幕后，电池百分比恢复到其原始百分比。
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: Celxpert
model: 5B10V98091
serial: 4143
power supply: yes
updated: Fri 08 Jul 2022 05:02:54 AM PDT (19 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: critical
energy: 2.31 Wh
energy-empty: 0 Wh
energy-full: 145.98 Wh
energy-full-design: 80.4 Wh
energy-rate: 13.419 W
voltage: 15.714 V
time to empty: 10.3 minutes
percentage: 3%
capacity: 91.99%
technology: lithium-polymer
icon-name: 'battery-caution-symbolic'
History (charge):
1657281774 3.000 discharging
History (rate):
1657281774 13.419 discharging
# After locking and unlocking the screen
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: Celxpert
model: 5B10V98091
serial: 4143
power supply: yes
updated: Fri 08 Jul 2022 05:03:24 AM PDT (18 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: discharging
warning-level: none
energy: 53.38 Wh
energy-empty: 0 Wh
energy-full: 145.98 Wh
energy-full-design: 80.4 Wh
energy-rate: 13.75 W
voltage: 15.312 V
time to empty: 3.9 hours
percentage: 71%
capacity: 91.99%
technology: lithium-polymer
icon-name: 'battery-full-symbolic'
History (charge):
1657281804 71.000 discharging
1657281774 3.000 discharging
History (rate):
1657281804 13.750 discharging
1657281774 13.419 discharging