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network manager dies and sudo hangs after logging in when in power save mode and on battery

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Recently, maybe after an update (not sure) the network manager seems to die, and also sudo hangs, AFTER I log in via GDM, IF it's in "Power Saver" mode, IF it's on battery. Here's what I mean.

  1. I change the power settings in the upper right from "Performance" to "Power Saver."
  2. I unplug the AC adapter (this may be a red herring...need to confirm this)
  3. I reboot.
  4. On the GDM screen before I log in, the WiFi indicator is on and shows I'm connected.
  5. After I log in, the WiFi indicator is gone, and I'm not connected.
  6. In a terminal, the command iwconfig hangs.
  7. In a terminal, likewise any use of sudo hangs.
  8. If I then try to shutdown or reboot, the system hangs.

I can kinda "fix" it by changing the power settings to "Performance" (after a hard shutdown), but it still leaves me puzzled over why this is happening, how I even can begin to troubleshoot it, and how I could ever use "Power Saver" mode. Any advice? Thanks!

Ubuntu version: Ubuntu 22.04.1 LTS

Hardware model: Lenovo ThinkPad P15 Gen 2i

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