Odd question: Laptop is "acting nuts" when transitioning from battery to AC or back...

[Michael Butash]

Sounds like bios/acpi shenanigans, especially with toshiba.  My last 
toshiba laptop was prior to using linux, mostly because the one I had 
had major acpi issues when i'd tried,  From what I know little has 
changed with time.

I'd disable or hard-set the governor for powerstep, in the bios if 
possible.  If it's 945, sounds like around the time they started using 
dynamic clocking with power management switching between "battery" to 
"wall power" and change the clock speed.  Older hardware didn't handle 
this so well until the bios took more granular control and hardware 
improved for dynamic clocking.  Wouldn't hurt to run a memtest too.

My old dell laptop did would crash with powerstep transitions (like a 
plugin/out) before mid 2.6.35ish kernels when dell got involved in 
fixing their acpi issues with the kernel maintainers, but also fixed 
bios issues too for linux.  Yours might not be fixed, toshiba doesn't 
work with linux to write exceptions to their quirks historically.  Hard 
setting the governor at the os level might help as well as disabling 
power management changes as a whole.

-mb


On 02/04/2012 08:39 PM, Jim March wrote:
> I won't have mitts on it until tomorrow but has anybody heard of
> crashes/glitches/etc. when plugging or unplugging a laptop from wall
> power while it's running?
>
> The critter in question has a decent battery in it and is running Mint
> 12, which is basically the same as Ubuntu Oneiric/11.10.  32bit
> install, older-but-still-decent Toshiba dual-core, Intel 945 video.
> It wasn't doing this under Ubuntu Jaunty.  Mint 12 has been a big
> performance boost 'cept for this one issue.
>
> I'm thinking it'll be something like ACPI settings need tweaking in Grub2?
>
> This may not be enough details to go on but...if anybody has seen
> anything like this, sing out.
>
> Jim
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