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

[Michael Pardee]

right after I left that last message I started thinking about hdparm...
long story short, it is the write cache control, which makes perfect sense -- if you turn off the hard drive write caching, writes could be painfully slow.
So, the solution is to set
CONTROL_HD_WRITECACHE=0
in /etc/laptop-mode/laptop-mode.conf
and everything seems to work great.  If I set it back to 1, it is slow again, so I'm pretty confident this is it.
Thanks!

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