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<p>Hi Tim,</p>
<p>Regarding the charge threshold, I've tried this feature on my own
Thinkpad (T470s) and it seems to be the case that it will always
stop at 1% below what value you set. There's also a handy set of
scripts packaged as <tt>tpacpi-bat </tt>(on Arch Linux at least)
which provide configuration files and startup scripts to help
manage some of these ACPI features.<br>
</p>
<p>I've also noted that even when the battery does reach the charge
stop threshold, it will still appear to be charging (in the OS,
and according to the lights on the laptop itself), however it will
stay the same level indefinitely and this behaviour is probably to
be expected.</p>
<p>As for your other questions, I've not looked into those things
and can't provide much advice. Good luck!</p>
<p>Cheers,</p>
<p>Felix</p>
<div class="moz-cite-prefix">On 10/10/19 7:20 pm, tec wrote:<br>
</div>
<blockquote type="cite" cite="mid:3c8e-5d9f1400-3d-704ec900@1561883">
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<p style="margin: 0px 0px 1.2em !important;">Hi All,</p>
<p style="margin: 0px 0px 1.2em !important;">Not sure if this is
likely to bear any fruit, but why not try it and see. If
anyone can help with any of these issues that would be great,
or if you could point me to the best place to ask that would
also be appricated :)</p>
<h3 id="t480s-battery-never-reaches-tlp-charge-stop-threshold"
style="margin: 1.3em 0px 1em; padding: 0px; font-weight:
bold;font-size: 1.3em;">T480s battery never reaches TLP charge
stop threshold</h3>
<p style="margin: 0px 0px 1.2em !important;">I’ve recently got
my first thinkpad, a T480s, and got it happily running linux
(Solus). Unfortunately I’ve run into a snag. I set <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">/sys/class/power_supply/BAT0/charge_start_threshold</code>
to 85%, and <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">.../charge_stop_threshold</code>
to 90%. It seems that once it gets to 89% it just sits there.
I waited for more than half an hour, and it stuck at 89%.</p>
<p style="margin: 0px 0px 1.2em !important;">I’m a bit lost,
does anyone have a suggestion?</p>
<h3 id="i915-enable_psr" style="margin: 1.3em 0px 1em; padding:
0px; font-weight: bold;font-size: 1.3em;">i915.enable_psr</h3>
<p style="margin: 0px 0px 1.2em !important;">Seeing <a
href="https://hansdegoede.livejournal.com/18653.html"
moz-do-not-send="true">this post</a> it looks like enabling
<code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">i915.enable_psr</code>
can be a good idea. So I put <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">i915.enable_psr=1</code>
in <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">/etc/kernel/cmdline.d/performance.conf</code>.
Since <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">cat /sys/module/i915/parameters/enable_psr</code>
gives <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">1</code>
I imagine that worked. However the recommended ‘test’ (<code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">cat /sys/kernel/debug/dri/0/i915_edp_psr_status</code>)
gives <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">Sink support: no</code>
when it should give <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">Enabled: yes"</code>
and <code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;">Active: yes</code>.<br>
Does this just mean that my pannel doesn’t support psr?</p>
<h3 id="powertop-display-backlight" style="margin: 1.3em 0px
1em; padding: 0px; font-weight: bold;font-size: 1.3em;">Powertop
& display backlight</h3>
<p style="margin: 0px 0px 1.2em !important;">I’m not sure how to
read this. If powertop reports (this is at <em>max</em>
brightness):</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">Power est. Usage Device name
3.15 W 100.0% Display backlight
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">I think this is
clearly 3.1W. Likewise at <em>min</em> brightness I see:</p>
<pre style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas, Inconsolata, Courier, monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block !important;">Power est. Usage Device name
1.88 W 1.0% Display backlight
</code></pre>
<p style="margin: 0px 0px 1.2em !important;">Does that mean the
display is operating at 0.02W or 1.9W?</p>
<h3 id="other-powersavings" style="margin: 1.3em 0px 1em;
padding: 0px; font-weight: bold;font-size: 1.3em;">Other
powersavings</h3>
<p style="margin: 0px 0px 1.2em !important;">If anybody knows of
any other good idas, I’d love to her them!<br>
<br>
Thanks in advance,</p>
<p style="margin: 0px 0px 1.2em !important;">Timothy.</p>
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