[Bug 35213] Re: hibernate fails when not on AC power on HP Pavilion ZT3000 - regression from breezy

[Bart Samwel]

I'm glad it's solved!

BTW, the default value for CONTROL_HD_WRITECACHE was already changed to 0 in version 1.20 of the upstream laptop-mode-tools package. Turning the HD writecache off while in laptop mode originally seemed like the "safe choice" -- to prevent the hard drive from spinning down while it hasn't written back all data yet. However, it turned out that in reality, hard drives never spin down while retaining unwritten data in the cache. So the option is best left turned off. In fact, I think I'll remove it. :-)

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hibernate fails when not on AC power on HP Pavilion ZT3000 - regression from breezy
https://launchpad.net/bugs/35213