[ltp] W520: strange suspend-to-ram issue solved!

Fionn Behrens linux-thinkpad@linux-thinkpad.org
Fri, 22 Jun 2012 10:44:32 +0200

Hi all,

I just wanted to tell you about the solution to a problem that has 
plagued me for months.

I have a Sandy Bridge W520 with Optimus. It showed the following 
behaviour: You could suspend (S3) it once without a problem, but after 
the second try, it would use a lot more power than before AND it wont 
run any faster than the lowest possible CPU clocking speed. This 
behaviour only went away when I shut down the computer, cut off power 
and restarted it.

Yesterday I found the solution to this: Install IronHide and use it to 
switch the nVidia Core just on and off once after resume. Not only does 
the power consumption go back to normal, but CPU frequency scaling 
suddenly starts to work again, too!

Now I have the perfect Notebook, at last - great display, a nice heap of 
RAM, up to 6hrs runtime on the stock 9cell and full quad core power when 
I need it. No compromises. YAY! :-)

hope this helps anyone who experiences the same issue.

kind regards,