[tech] [Request for help] Issues on my T480s

[Felix von Perger]

Hi Tim,

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 tpacpi-bat (on Arch Linux at least) which provide 
configuration files and startup scripts to help manage some of these 
ACPI features.

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.

As for your other questions, I've not looked into those things and can't 
provide much advice. Good luck!

Cheers,

Felix

On 10/10/19 7:20 pm, tec wrote:
>
> Hi All,
>
> 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 :)
>
>
>       T480s battery never reaches TLP charge stop threshold
>
> 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 
> |/sys/class/power_supply/BAT0/charge_start_threshold| to 85%, and 
> |.../charge_stop_threshold| 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%.
>
> I’m a bit lost, does anyone have a suggestion?
>
>
>       i915.enable_psr
>
> Seeing this post <https://hansdegoede.livejournal.com/18653.html> it 
> looks like enabling |i915.enable_psr| can be a good idea. So I put 
> |i915.enable_psr=1| in |/etc/kernel/cmdline.d/performance.conf|. Since 
> |cat /sys/module/i915/parameters/enable_psr| gives |1| I imagine that 
> worked. However the recommended ‘test’ (|cat 
> /sys/kernel/debug/dri/0/i915_edp_psr_status|) gives |Sink support: no| 
> when it should give |Enabled: yes"| and |Active: yes|.
> Does this just mean that my pannel doesn’t support psr?
>
>
>       Powertop & display backlight
>
> I’m not sure how to read this. If powertop reports (this is at /max/ 
> brightness):
>
> |Power est. Usage Device name 3.15 W 100.0% Display backlight |
>
> I think this is clearly 3.1W. Likewise at /min/ brightness I see:
>
> |Power est. Usage Device name 1.88 W 1.0% Display backlight |
>
> Does that mean the display is operating at 0.02W or 1.9W?
>
>
>       Other powersavings
>
> If anybody knows of any other good idas, I’d love to her them!
>
> Thanks in advance,
>
> Timothy.
>
> ​
>
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