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djentoo
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PostPosted: Mon Apr 02, 2018 1:18 pm    Post subject: [solved] Computer crashing Reply with quote

I think this is more of a hardware thing than a Gentoo thing. I just bought a used laptop on Craigslist - Samsung Chronos 7. The battery charges when I am running a liveCD of another distro. It also appears to charge while off. When in the BIOS or during a Gentoo installation, and the laptop is plugged in, the brightness level flashes between high and low simultaneously with the charge indicator. If the battery is unplugged, the computer will run fine in BIOS, but attempting to boot a CD, USB, or other installation medium causes it to crash. I have tried playing around with the power management settings in BIOS, but the problem persists.

Is it the motherboard? Battery problem? Is the charger defective? The charger is not Samsung; it appears to be a 3rd party, perhaps a replacement. Multimeter readings indicate ~18v. Any suggestions or ideas are appreciated!

My thinking is:
power management problem with the bios
faulty motherboard
laptop is drawing more than what the adapter can output
weak connection to adapter is building resistance and not allowing full current.

Just so frustrating... I'm almost to the kernel configuration process. Everything was going smoothly with the SSH until the battery died.

edit: some other thoughts... Samsung said that the charger should be 90w 19v. The charger has an output of 19v @ 2.1A. Samsung did not say what the rating should be. So I am wondering if it's just overdrawing.


Last edited by djentoo on Mon Apr 02, 2018 5:39 pm; edited 1 time in total
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NeddySeagoon
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PostPosted: Mon Apr 02, 2018 2:37 pm    Post subject: Reply with quote

djentoo,

Well, 90w at 19v is 4.7A.
A 2.1A charger probably won't do, that's only 39.9W

If the flicker time is a second or two, the changer will be detecting the overcurrent condition and doing shutdown/restart cycles.
If the flicker time is longer, it will be thermal overload and cool down cycles.

The laptop won't want 90W all the time. That's its max power draw, including some battery charging.
If you can keep the power load under 39.9W you might get it to work.

A gentoo install will make the laptop work hard while it compiles packages, so you will want that 90W.
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Computer users fall into two groups:-
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djentoo
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PostPosted: Mon Apr 02, 2018 5:39 pm    Post subject: Reply with quote

NeddySeagoon wrote:
djentoo,

Well, 90w at 19v is 4.7A.
A 2.1A charger probably won't do, that's only 39.9W

If the flicker time is a second or two, the changer will be detecting the overcurrent condition and doing shutdown/restart cycles.
If the flicker time is longer, it will be thermal overload and cool down cycles.

The laptop won't want 90W all the time. That's its max power draw, including some battery charging.
If you can keep the power load under 39.9W you might get it to work.

A gentoo install will make the laptop work hard while it compiles packages, so you will want that 90W.


Thank you for replying. I went and bought a 90w power supply, and the problem has been solved.
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