I've recently received my XPS 13 9300 (13", 1065G7, FHD) and I am very happy with it so far. The only thing that has been bugging me slightly is a sudden drop in performance when battery is getting low. This is happening in both Windows and Linux, rebooting doesn't help either. I'm on the newest BIOS version (1.0.7).
I tried to reproduce an exact charge, but it seems to happen somewhere between 13% and 19% of battery left. CPU speeds will never exceed 1.3 GHz which is the base speed of my CPU. If I put load on all cores simultaneously, it'll be at around 1 GHz. Package wattage will never exceed 5W, compared to 15W under normal conditions.
Everything returns to normal as soon as I plug my charger in.
Can anyone confirm this happens on their laptop too? Is this normal behaviour for Intel CPUs or is it a Dell feature?
I will add I've tried every option in Dell's power manager, also in both Linux and Windows power settings with no effect. If this is actually supposed to be a feature it would be nice to have an option to activate this later as 15% battery left means about one and a half hour of web browsing. Any help would be appreciated 🙂
Dell has confirmed this apparently is intended behaviour. Anyone else experiencing this? I'd love to be able to work until my battery runs out, not until my laptop decides to throttle my CPU so hard that performance is slowing to a crawl.
I've tried all settings in Power Manager with no result. These mostly apply to situations where load is high and sustained, however for me this behaviour happens when battery is low, irrespective of actual load.
I have it too to the point that my $2000 machine feels like a 6-years old laptop while there's still plenty of juice to burn. I really hope there'll be a BIOS setting for this.
XPS 9300 is disappointing in a number of fields, two of which (fn-left/right and cpu throttling) could be addressed with a flick of Dell's finger.