Oct 14, 2026, 8:04 AMNew blog post! Yet another attempt to implement secure hibernation on Linux when lockdown is enabled: https://codon.org.uk/~mjg59/blog/p/linux-lockdown-and-hibernation-again/
- Oct 14, 2026, 8:04 AM
Replies
Carloscarloscabello@fosstodon.orgOct 14, 2026, 8:35 AM@mjg59 just two days ago I was trying to fix my laptop draining so much battery when the lid was closed.
I learned that:
1. For stand-by mode, many manufacturers fail to ship firmware supporting a "deeper" level of power saving. The softest stand-by mode consumes a lot of power, but usually is only mode available.2. For hibernation, in which laptop is effectively off, memory has to be dumped to disk. Which is incompatible with secure boot.
Your post goes very deep. Thanks.
- Oct 14, 2026, 8:41 AM
@carloscabello (1) isn't really true - it's "just" that modern laptops need driver support for ensuring everything is powered down rather than having the firmware do it, and Linux isn't great at that
- Carloscarloscabello@fosstodon.orgOct 14, 2026, 8:54 AM
@mjg59 thanks for the clarification. I know I have a very surface-level understaing about this.
- Oct 14, 2026, 8:54 AM
@carloscabello it makes very little difference to the end user!