4 ms·

Is it running Windows? I've found that on Linux this specific issue doesn't happen, it will turn off the fans, and they will stay off. But the battery is still

Is it running Windows? I've found that on Linux this specific issue doesn't happen, it will turn off the fans, and they will stay off. But the battery is still drained, even though, on average, I tend to get better battery life than with Windows on the same machine. But Windows tends to wake it up randomly and do God knows what, since the PC will actually be hot to the touch. Bonus points for attempting to install updates, then reboot, only to end up stuck waiting for the BitLocker PIN.

liminalsunset 2y ago
The BitLocker thing is definitely a problem. On Apple systems which have a similar FDE system, the preboot environment will shut the machine down if the page is left open for too long. The CPU/GPU (if present) are in a pre-power-management state during this time too, so the laptop will really heat up. I wonder how limited the preboot BitLocker screen environment really is. Could there could be some flag set by the UEFI that says "I'm a laptop and the lid is closed without power connected, shut down after a timeout".
- vladvasiliu 2y ago
  In my case, my computers will end up on that screen in two cases. The first is my desktop, without a TPM, which will ask for a BitLocker password. In this case, if I'm not fast enough, it will shut down the computer. The second is my work laptop, which I usually expect to reboot or otherwise am around when it ends up there, in which case I'll usually type in the PIN quickly enough. However, I expect it to have a similar behavior as the first case, although I haven't tried. But the reason I know this happens, is that I once left this PC attached to my 32" screen next to my bed, and it woke me up at night. I just went and forcibly shut off the thing.
  - liminalsunset 2y ago
    So apparently this is actually configurable, but it's either on or off, and it's set to one minute by default (either 1 minute or no shutdown, no inbetween). The command in question is ```bcdedit /set {bootmgr} bootshutdowndisabled 1```. https://www.tenforums.com/antivirus-firewalls-system-security/103966-bitlocker-tpm-pin-laptop-shuts-down-after-60-seconds.html https://www.tenforums.com/antivirus-firewalls-system-securit...
71bw 2y ago
>But Windows tends to wake it up randomly and do God knows what, since the PC will actually be hot to the touch. For the best part of a decade the first thing I do on any mobile device I touch is disable wake calls in the power plan settings. Learned it the hard way after the T420 woke me up multiple times per night with loud beeps...

liminalsunset 2y ago

The BitLocker thing is definitely a problem. On Apple systems which have a similar FDE system, the preboot environment will shut the machine down if the page is left open for too long. The CPU/GPU (if present) are in a pre-power-management state during this time too, so the laptop will really heat up. I wonder how limited the preboot BitLocker screen environment really is. Could there could be some flag set by the UEFI that says "I'm a laptop and the lid is closed without power connected, shut down after a timeout".

vladvasiliu 2y ago
In my case, my computers will end up on that screen in two cases. The first is my desktop, without a TPM, which will ask for a BitLocker password. In this case, if I'm not fast enough, it will shut down the computer. The second is my work laptop, which I usually expect to reboot or otherwise am around when it ends up there, in which case I'll usually type in the PIN quickly enough. However, I expect it to have a similar behavior as the first case, although I haven't tried. But the reason I know this happens, is that I once left this PC attached to my 32" screen next to my bed, and it woke me up at night. I just went and forcibly shut off the thing.
- liminalsunset 2y ago
  So apparently this is actually configurable, but it's either on or off, and it's set to one minute by default (either 1 minute or no shutdown, no inbetween). The command in question is ```bcdedit /set {bootmgr} bootshutdowndisabled 1```. https://www.tenforums.com/antivirus-firewalls-system-security/103966-bitlocker-tpm-pin-laptop-shuts-down-after-60-seconds.html https://www.tenforums.com/antivirus-firewalls-system-securit...

71bw 2y ago

>But Windows tends to wake it up randomly and do God knows what, since the PC will actually be hot to the touch. For the best part of a decade the first thing I do on any mobile device I touch is disable wake calls in the power plan settings. Learned it the hard way after the T420 woke me up multiple times per night with loud beeps...