Ubuntu
linux package

  1. Bug #578673
  2. Comment #139

Comment 139 for bug 578673

Revision history for this message
Michal (mikeos) wrote :

It has proven incorrect assuming that the problem is caused by linux CPU power management. With a special kernel, where cpufreq is modularized (http://www.linux-phc.org/) i was able to completely remove cpufreq thus finally nothing was managing CPU frequency scaling (P-states), I also disabled intel_idle driver which manages C-states. Btw. powertop looks really cute when the upper C-states and P-states monitoring area is empty ;-)
The result is still the same - system freezes on S3 resume from batteries.
I still confirm that with SpeedStep disabled in BIOS the laptop resumes perfectly with full CPU power management enabled; however this seems to be just a coincidence proving nothing about the real cause of the problem.
Same behavior observed with A03, A04 and A05 BIOS.

Anyone here with Latitude E6410 can test S3 resume on batteries and post the results including their HW/SW specs? Please try at least 5 successive suspend/resume cycles without AC-power plugged in.

It would be nice to know at minimum whether just a certain HW configuration is affected (e.g. models with nVidia card).