HP laptop off but USB power stays on - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: November 16, 2020, 01:03:55 pm
content: I have a HP Envy laptop that I use with a chip programmer. When I turn the laptop off the programmer stays powered and of course this would eventually run the battery down. Is there some way I can stop this happening?Actually, while writing this I just realised this might be happening only when the charger is connected. I’ll have to unplug it and see what happens.

author: wraper
author_rank: Unknown
timestamp: November 16, 2020, 01:17:27 pm
content: First disable fast startup in windows power settings, otherwise it's not fully shutting down. And with SSD it does not make boot faster to any significant amount if at all, but certainly makes shutdown slower and drains power. If it does not help, check if there is anything in BIOS settings, though unlikely to be there for laptop.

author: bitwelder
author_rank: Super Contributor
timestamp: November 16, 2020, 03:18:22 pm
content: Quote from: wraper on November 16, 2020, 01:17:27 pmActually, I remember in some model of Lenovo Thinkpad (like the T450s) the BIOS settings has exactly such a setting.I can't comment on HP ones

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: November 16, 2020, 03:39:00 pm
content: Quote from: bitwelder on November 16, 2020, 03:18:22 pmAll somewhat newer HP business laptops (EliteBook, ProBook, zBook) have a similar setting in the BIOS to enable or disable the USB charging function of certain USB ports so that phones and other USB devices can be charged when the laptop is powered down.I'm pretty sure the Elite Series has a similar setting.

author: IDEngineer
author_rank: Super Contributor
timestamp: November 23, 2020, 10:29:41 pm
content: Quote from: bitwelder on November 16, 2020, 03:18:22 pmMy Thinkpad X260 hasexactlythat option in its BIOS. I consider it a huge advantage. It allows you to make a USB connector a source of power even if the laptop iscompletelypowered down. Combined with its dual batteries (internal and externally swappable) it's incredibly useful.This is my first ThinkPad, but seriously it's the ultimate Road Engineer machine. Natively runs Win7 (a personal requirement). Has all the standard ports (rather than requiring USB dongles for everything) so I can natively connect to Ethernet, USB, video, etc. The internal battery keeps it running while you hot-swap the regular battery, and with both batteries charged you get an easy 16-20 hours of normal use. Carry a spare battery and you can get a full 8-10 hour workday while letting it power external devices like programmers, debuggers, and (presumably) USB tools like a scope. It's got an i7+32GB+SSD so plenty of computational grunt, and while it doesn't have hardware graphics acceleration it's been plenty fast for everything except live Premiere Pro editing.Standard disclaimers, no association, etc. It's not paper-thin like the latest museum flagship laptops but it runs twice as long and is at least twice as flexible.

author: Monkeh
author_rank: Super Contributor
timestamp: November 23, 2020, 10:32:50 pm
content: Quote from: wraper on November 16, 2020, 01:17:27 pmHibernation and shutdown are indistinguishable at the hardware level. The only difference is some legacy hand-holding from the BIOS at boot (because Windows wasn't very smart).

author: wraper
author_rank: Unknown
timestamp: November 23, 2020, 10:37:08 pm
content: Quote from: Monkeh on November 23, 2020, 10:32:50 pmExcept they are not. As minimum Lenovo recommends disabling fast startup to avoid battery discharge while turned off. Exactly what I suggested.https://pcsupport.lenovo.com/ar/en/products/laptops-and-netbooks/thinkpad-l-series-laptops/thinkpad-l540/solutions/ht509457

author: Monkeh
author_rank: Super Contributor
timestamp: November 23, 2020, 10:39:27 pm
content: Quote from: wraper on November 23, 2020, 10:37:08 pmThen Lenovo must be playing some very silly games, because S4 and S5 should be electrically equal.