Mitch Bradley wrote: > [EMAIL PROTECTED] wrote: >> Another strange thing I see with q2e19 is that at 19% battery, >> according to the battery gauge, the battery indicatory lamp started >> flashing red and orange. > > That would be a function of the EC code. Richard, any thoughts? >
Yes. That is one of the 3 new EC features in this release. I had to leave for my weekend before I could do proper changelog docs on the wiki. Alternating red/yellow battery LED is the critical voltage level warning. It means that your battery voltage has dipped to where its crossed the 5.7V threshold. It means that you are into the very non-linear voltage discharge curve. If it reaches 5.35V the EC powers off the voltage regulators for the rest of the system. 5.7V is a bit of a guess on my part. I tried to make it close enough to the hard shutoff that its meaningful yet far enough out so that there's enough time to do something even on batteries where the curve rolloff is very steep. This should normally appear when the battery is less than 10%. The hard shutoff occurs somewhere in the 4%-7% zone. [1] It should not have occurred at 19%. So one of 2 things happened: 1) EC Code bug. 2) Your SOC % reading does not reflect the actual state of the battery. Item 2 can occur 2 ways: 1) It sat on the shelf or in an XO turned off for a long time (ie weeks) 2) You have the charge balance problem in your cells. olpc-pwr-log will tell you which of the above is at fault. My bet would be its an early warning sign of 2.2 which is good since thats exactly one of the things this is supposed to try and detect. To test: Run your battery down until the EC shuts you off remove battery. Power up the XO without the battery once booted run olpc-pwr-log in a VT or disable idle-suspend Insert the battery Charge until full Ctrl-C restart olpc-pwr-log After you see the first line of log output pull the power cable Let it run till the EC shuts you off. Then look at the 2nd log file (the discharge cycle). The very last columns of numbers should end up in the -2800 to -3100 range. If not then your battery is suspect. Send me the 2 log files regardless because I want to review them. There's also some info here: http://wiki.laptop.org/go/XO_LiFePO4_Recovery_Procedure But if you really are only off by 10-13% then it maybe hard to tell looking at the charging log as described in that procedure. The log analysis on the wiki is for the most common charge balance failure symptoms. [1] The SOC % reported up to the host is based on the typical raw capacity of the battery not the usable capacity which is why the numbers for fully charged and empty are weird. Scaling this % so that its a sane 0% - 100% is on my list of changes for 9.1 -- Richard Smith <[EMAIL PROTECTED]> One Laptop Per Child _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel