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Joined 2 years ago
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Cake day: June 21st, 2023

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  • Oh, apologies for my suggestion before seeing this comment hahaha!

    CAN devices I have limited experience with, but I know at least in the automotive industry, vehicles often have various CAN devices that have various sleep states. Like, shut car off, it holds brake system for a few minutes and then unlocks the brakes and that ECU shuts down. Later on, an emissions ECU may run a self-diagnostic. After a few days being powered off, the security ECU goes into low power and turns off wireless doorlocks. After the voltage drops too low, the ECU in the head unit ostensibly shuts down, and the next time the car is started, the head unit has to do a cold-reboot and takes a fortnight.

    Could be one of those CAN devices takes some time to get into the “off-adjacent” state to manifest the bug?


  • Could the time delay in being able to reproduce relate to some piece of code that has a timeout (thinking login timeout, cookie expiration, auth timeout, that sort of thing.) Or likewise, if the computer in question has multiple shutdown phases, like how many computers today “sleep” to RAM, and then an hour later sleep to disk in a more hibernatey fashion and fully power off? (Or some weirdness like how Windows shutdown now is ostensibly a hibernate, but a reboot is actually a full “power down power up” without shutting off power.)

    I like @Buddahriffic@lemmy.world 's take on being wall-clock-based. I once had a bug with some software that would just go belly-up on certain days for no reason whatsoever in a datacenter 2000 miles away. After having worked on some bare metal servers in the past and learned all about thermal issues firsthand, I checked the weather in that region. It only seemed to happen on extremely hot summer days, at the day’s temperature peak. Turns out the datacenter vendor had a cooling problem in that section of the DC and they were unaware of it…

    Crazy sometimes how bugs manifest.


  • There’s a weird obscure bug in M$ Remote Desktop in Windows 11 Pro I spent entirely too much time trying to track down, as a user. (Yes, the first mistake was ever getting near Windows, but anyway.)

    It looks like there is some kind of counter that now exists in number of logged in sessions, and each RDP session counts as a one-time-use session. The local user does too.

    • If you log in locally on first boot, there’s a 25% chance you’ll be able to log in remotely from one machine once or twice.
    • If you log in as a remote user from boot, you’re more free to log in remotely, possibly from two different machines about 75% of the time, but if you just use one other machine, pretty much forever.
    • Rebooting always solves the login issues, so much so that a terrible terrible workaround was employed. Enable OpenSSH server (now included in Windows) on Windows, to SSH into the box (which, reliably works every time no matter what) and reboot it.
    • So many Internets on the topics, including using their old RDP driver, that the new driver may be cranky, that the host graphics drivers may have an impact, that the BIOS OOB management may have an effect. Nothing ever fixed it consistently.

    Thankfully, my life means too much to me to go further down the rabbit hole and I don’t have to use Windows as much anymore, and hopefully soon never, but…its like they took a whole team of engineers to break something that has worked amazing since the early aughts and just firehosed pigeon turds all over it.

    They obviously care enough to keep it working as they renamed the RDP app to “Windows App” in the last year, but don’t care enough to make it work correctly?



  • Here’s the thing. CFCs were used until the manufacturers could patent the next harmful chemical to keep the profits. The replacements are also bad, it turns out. Just like how all that “BPA plastic” hubub ended up with “BPA-free plastic” that was literally just another synthetic estrogen. Same problem, but it isn’t BPA so people thought the problem was solved.

    CFCs:

    • Bad

    HCFCs:

    • Slightly less bad, but: HCFCs still have some ozone depletion potential (ODP) and are being phased out under the Montreal Protocol.

    HFCs:

    • HFCs do not contain chlorine, so they have zero ozone depletion potential (ODP).
    • They are potent greenhouse gases with high global warming potential (GWP), leading to further phase-outs under the Kigali Amendment to the Montreal Protocol.

    Now they’re shooting for:

    • hydrofluoroolefins (HFOs) and natural refrigerants (like CO₂, ammonia, and hydrocarbons).

    Reality is, the trope with old cooling machines being so much better than newer ones is that they didn’t care about “efficiency” when designing them and the machines just ground their compressors to death getting the job done.

    New AC units use modulated power to the motors, multiple cooling stages, and other “efficiency” features to make them more energy-efficient, start more gently, and run “better” on paper (although the added complexity, as statistical analysis will show, also adds to more reasons for the machines to fail.)

    I actually recently begrudgingly went from a 20 year old “last of the CFCs” type AC unit to a modern one using one of the newer-but-eventually-will-be-banned refrigerants. Didn’t want to give it up, for the trope. When all said and done, I went from a 12F degree temp differential across the old unit to 24F on the new unit. (Input temp drops by X degrees on output.)

    And the CFCs were safely bottled up from the system when replaced (although they likely made a hefty profit on the stuff since it is banned but can be reused in the US.)










  • Literally not how it works at all. The body knows the amount of nicotine it wants and the smoker will smoke until that “need” is fulfilled. Weaning off nicotine is easiest in tiny amounts over time, or a few weeks of cold turkey hell.

    The US has been gutting vaping as an alternative too, which forced more back on analogs. The US doesn’t want to stop smokers from smoking anyway. Lots of tax revenue.

    Best thing too, the “quit” stuff like lozenges, patches, and gum, are often higher nicotine levels than a smoker is used to. The “low” dose products are for pack-a-day smokers and the “high” dose products are for 2-pack-a-day smokers. So smoker tries to quit, can’t, and ends up smoking more cigs when they return.

    It’s a vicious cycle, and it seems also a natural method to combat ADHD, so it’s completely possible some people get on cigarettes, suddenly their brain is functioning correctly, and they’re addicted for life twice over.

    Feel free to use your favorite internet search engine for further info. That’s what they are there for. (The last bit with ADHD is new-ish? So not sure what data is available there.)