Date: Wed, 28 Aug 2019 18:32:42 +0000 From: bugzilla-noreply@freebsd.org To: acpi@FreeBSD.org Subject: [Bug 234403] [acpi_ibm] Support ThinkPad battery charge start/stop control Message-ID: <bug-234403-16045-2KW3qXWPiM@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-234403-16045@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234403 --- Comment #9 from rkoberman@gmail.com --- I'm using it on my T520 and it is working fine. I read the old IBM whitepaper on this and they recommend keeping hte btter at or below 85% when a ystm is usually plugged in. Not sure just what they implemented, but the paper proposed that the percentage of time on battery be tracked and if the battery percentage was below a threshold, the maximum charge be reduced to 85%. If the charge dropped below come low value (20%?), the maximum charge would reset to 100% for some time. Statistics were to be retained across boots. It's at least 20 years, so my memory of details is fuzzy, but I'm thinking of writing something to implement at least a bit of this scheme, but I have done little coding since kernels and drivers were written in assembly, so I'm hardly the ideal person for the job. -- You are receiving this mail because: You are the assignee for the bug.home | help
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