On 14/07/2022 10.00, gumb wrote:
On 12/07/2022 07:39, Carlos E. R. wrote:
My later phone controls charging, and uses slow charging itself. It adjusts the charge to finish by the time of the wake up alarm. So, in modern laptops, continuously connected but limiting the charge to, say, 90%, should be perfect.
I think it makes more sense on my phone, because it's only plugged in for charging, otherwise it's running on battery. Whereas with my laptop, it's plugged in 99% of the time. So I don't really know what advantage or disadvantage there is in the system continually topping up the battery to 100% as opposed to 90%. Does the latter prevent excess energy usage or overheating?
AFAIK, yes.
If I were running it like my phone and doing repeated charging/discharging cycles I can understand the concept of letting it modulate between a restricted charging range, but if I've charged it once to 100% and then it just keeps it there, does that really do any harm longer term? By restricting it to 90%, will the battery start to 'lose its memory' of that extra 10% and render itself only nine-tenths as powerful? I never see these specifics addressed anywhere because all articles and conversations about the topic assume laptop users run primarily on battery like they would with a telephone.
There is no memory effect on the current batteries. However, it is easy to overcharge, and keeping at 90% avoids that risk. Mind, as long as it is a constant 90%, not cycling.
I get these weird messages in my notifications:
Message from syslogd@linux at Jul 3 15:34:04 ... kernel:[ 87.166486][ C0] Uhhuh. NMI received for unknown reason 20 on CPU 0. Message from syslogd@linux at Jul 3 15:34:04 ... kernel:[ 87.166498][ C0] Do you have a strange power saving mode enabled? Message from syslogd@linux at Jul 3 15:34:04 ... kernel:[ 87.166500][ C0] Dazed and confused, but trying to continue
Unrelated.
Well, it is related. I should get typically around 3 hours' battery life, but rarely when I unplug do I not encounter this situation where with the battery level at anything between 99% and >20% (i.e.
Not related. The message is about some of the machine CPU sleep states, not battery modes.
non-critical) and everything seeming normal, the laptop abrubtly goes into a critical battery level panic and attempts to hibernate. I can stop it if I scramble for the power lead and plug it in within x seconds, where x always equals half a second before I manage to plug it in. When I power it back on it sometimes recovers from hibernation, sometimes just does a fresh boot suggesting data loss or corruption could have occurred (though to date I've not noticed any). And I get these messages implying I must have some weird power saving setup and hence it's all my fault. Yet I have pretty much the same power settings as I've always used on my two previous laptops without encountering this warning. Usually, after this has occurred once, if I plug it back in and then unplug, it doesn't happen again, as if the charge level statistics have been reset and corrected.
Battery problem just happens at the same time, then machine tries to sleep to conserve battery, and then the kernel is confused. But the message is related to CPU estates.
I opened the laptop the other day to do some cleaning since it's started increasingly making fan noise having been entirely silent for two and a half years prior. Fan and interior was all perfectly clean. Applied some fresh thermal grease to the CPU/heatsink. Still makes increasing fan noise. In putting it back together it requires a bit of squeezing tight to put the screws in, because it seems to me that the battery has puffed up to some degree. I didn't try removing it or any of the surrounding insulating material to inspect it in detail. I don't recall it being like that the only other time I opened it two or three years ago but I didn't pay too much attention back then. Makes me wonder if that's a common thing or whether my continual charging could be causing it to enlarge, which would be worrying. Unfortunately, unlike my two previous laptops which had detachable batteries, this one's removable but only by taking the device apart. Because if I could remove it easily I would, and just run on AC power.
gumb
Dunno. 2yrs is too soon for degradation in modern laptop. -- Cheers / Saludos, Carlos E. R. (from openSUSE 15.3 (Legolas))