suspend to disk is slow when running on batteries

Bug #40041 reported by Luka Renko
6
Affects Status Importance Assigned to Milestone
powersave (Ubuntu)
New
Medium
Unassigned

Bug Description

If you suspend to disk when on power plugged in, it takes normal time (20-30 seconds). If you do it on battery, it will take 12-15 minutes.

http://www.ubuntuforums.org/showpost.php?p=930111&postcount=91

This has been tested and atribued to laptop-mode-tools which is enabled by default in Dapper when laptop is running on batteries. Recent acpi-support packages disable laptop-mode before performing suspend and it seems that something similar needs to be done for powersave.

Revision history for this message
Luka Renko (lure) wrote :

see bug 35213 - it looks like that CONTROL_HD_WRITECACHE option of laptop-mode is the root cause of the problem.

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