Hi, Rafael, I am using internal WDC laptop HDD. I will give SDD a try even though I only have non-Intel SDD now. Is your SDD the boot disk (by swapping the built-in HDD out) or the extra one installed using device bay on Dell laptop? Thanks, Jian 2011/5/19 Rafael J. Wysocki > On Thursday, May 19, 2011, Jian Peng wrote: > > Hi, Rafael, > > > > Yes. I tested without reverting the patch that caused failure on E6410 > (with > > same AHCI controller), The system is Ubuntu 11.04 with default 2.6.39-rc6 > > kernel (guess this should be same kernel as yours before reverting the > > patch). > > > > My system worked well with AC power cable plugging in and out at boot > time, > > at runtime, and during "dd if=/dev/sda5 of=/dev/null ..". > > What kind of disk did you use? Mine is an Intel SSD. > > > The config file I mentioned is those under /etc/ or other directories > that > > is used to control the power management. > > They aren't relevant to this issue. > > > Did you test my patch? What it the result? > > No, I didn't. Unfortunately, I won't be able to do any tests on the > affected > machine in the near future (most probably for the next two weeks or so). > > Thanks, > Rafael >