cross-posted from: https://infosec.pub/post/51989792
from https://systemli.social/@anneroth/117228668085415636
“20,000 mail accounts. 20,000 blogs. 5,000 mailing lists. 1,500 websites.
In Europe.
Run by volunteers of @cavallette, perfectly legal, and decidedly antifascist, feminist, queer.
Destroyed and shut down by Trump’s administration, extra legally.”
If you ever need to give a reason for refusing to use email, add this to the list of possible reasons.
I saw an HP pavilion 17-f048nb at a street market and cannot find the specs for this. I simply want to know if the CPU is AMD, and if so which AMD. It’s such a shitshow on HP’s website. Considering the same HP model can sometimes have either intel or AMD, do I have any way to find out?
Sometimes you can get /some/ details based on the serial number at https://partsurfer.hp.com/ but not the CPU.
A slightly different model (17-f048ca) reportedly has an amd chip. But what do the last two letters mean? Is that a country code for where it is deployed?
I am trying to get a grasp of how to identify what power standards various PSUs claim to conform to. The label on this Dell PSU is ram-packed with info, but I see no direct claim that it supports USB-PD at all.
The range of voltages might imply that perhaps maybe it’s USB-PD, but I see no indication where they take credit for that; much less a particular PD revision. IIUC, that means if it’s USB-PD non-compliant and someone drags Dell into court, they can say to the judge “we never said it was USB PD-compliant”.
The review that probes this thing shows that the PSU is detected as PD3.0. Yet at the same time it does not support PPS according to the blogger. So wtf… how can it be PD3 if it does not support PPS?
It seems Dell is banking on consumers not being keen to read the label. According to the blogger:
The odd thing is that it is advertising itself as a 96W adapter (20V/4.8A) which is different to the printed 20V/5A rating on the rear.
So it seems has Dell decided that if they do not benefit from advertising a capability, they might as well not mention it and downplay what it can do, for legal purposes.
The blogger goes on to test it with all kinds of fancy costly gear that no typical consumer would have. When I am at a street market rifling through a pile of dumped electronics, how do I know what I am looking at? Do any of the cryptic symbols on that Dell label suggest USB-PD?
cross-posted from: https://infosec.pub/post/51092505
I have a 3-pin Dell PSU spec’d as 19.5v 3.34A and DMM measures at 20v unloaded. The power reqs on the HP laptop are 19.5v 3.33A. AFAICT, that’s a match. Even the 3-pin barrel connector geometry matches. So what’s the problem?
The center pin is a “smart pin” aka “data pin”, as I came to learn. According to @over_clox@lemmy.world, this PIN basically passes brand info so HP can reject non-HP PSUs. But according to this article, the data pin is used to “regulate” the voltage – which I take to mean it negotiates the voltage for transmission as USB-PD does. If it’s merely negotiating power reqs, then the Dell should work.
It’s possible both sources are correct… perhaps HP has its own proprietary way of negotiating voltage and Dell has theirs.
Someone even claims that the data channel is used to communicate temp info so a PSU does not overheat. If that’s true, then perhaps it was a good design (noting that the USB-PD standard did not emerge yet).
But is it true about the communication? Considering there are hacks with a resistor or something to satisfy the data channel, it’s hard to believe that the communication is that sophisticated.
This page advises HP owners to always buy HP-branded PSUs. But it’s unclear if that’s just overly safe nonsense.
cross-posted from: https://infosec.pub/post/51012219
I bought an untested 2nd-hand HP probook 645 g1. When I plug it in, the power button just flashes. It does not look like an error code. It flashes every second or so. No long flashes and does not pause. It’s uniformly separated blinks that never stop.
It does this with or without memory installed. There is no hard drive but I don’t imagine that would stop it at least booting to the BIOS. I tried removing the wi-fi card and CD drive to ensure there is no problem to detect on those components. I also tried unplugging, removing the battery, and also detaching the cr2032 CMOS battery for some time. No matter what, the power button just blinks when it gets power. The power button is non-responsive.
What might the issue be?
One friend’s theory is that the machine is extremely fussy about the brand of PSU. I am using a Dell PSU to power the HP. It is 19.5v, as specified. So in terms of physics it should work. My friend’s theory is that genuine OEM HP PSUs give 19.51v (for example) and HP is somehow detecting that it’s not an HP PSU. Does that sound plausible?
