ACPI problem, laptop crashes when plugging power

The_Sorce · 05-29-2007, 02:32 PM

Hi!

I'm having a weird problem with my Uniwill 755II0 laptop. The computer works fine, but when plugging (or sometimes also when unplugging) the power cord (i.e. switching power source) I experience graphical errors (vertical lines and so on), and the system completely freezes, and nothing but a restart helps.

I have analyzed this, to the limit of my own knowledge (which is not much), and found the problem to be caused by ACPI. When starting the system without ACPI, I can switch power sources as much as I'd possibly want, without any crashes. Because of this, I am now running without ACPI, not being able to view battery level or use any power saving functions.

If I've understood correctly, APM should be able to provide similar functionality. Unfortunately, my laptop motherboard does not implement standard APM. No matter what the APM option in the BIOS is set to (enabled/disabled), on boot, APM always returns the well known "APM: BIOS not found."-error. Unfortunately, there is no BIOS upgrade available for my motherboard either.

Let me also clarify that this is not a distro-specific problem. My current distro of choice is PCLinuxOS-2007, but I have also tried many different live-cds (including ubuntu 6.06.1 and 7.04, KNOPPIX 5.1.1, SimplyMEPIS 6.5.02, SabayonLinux 3.3b and some more), with exactly the same result.

So, can anyone point me in the right direction with this problem? If it is any help, the output of dmesg (when booting with ACPI, of course) is available here:

http://www.parnet.fi/~tony/dmesg.txt

Any help would be greatly appreciated!

nightwalker1977 · 06-01-2007, 11:40 AM

Quote:

Originally Posted by The_Sorce

Hi!

I'm having a weird problem with my Uniwill 755II0 laptop. The computer works fine, but when plugging (or sometimes also when unplugging) the power cord (i.e. switching power source) I experience graphical errors (vertical lines and so on), and the system completely freezes, and nothing but a restart helps.

I have analyzed this, to the limit of my own knowledge (which is not much), and found the problem to be caused by ACPI. When starting the system without ACPI, I can switch power sources as much as I'd possibly want, without any crashes. Because of this, I am now running without ACPI, not being able to view battery level or use any power saving functions.

If I've understood correctly, APM should be able to provide similar functionality. Unfortunately, my laptop motherboard does not implement standard APM. No matter what the APM option in the BIOS is set to (enabled/disabled), on boot, APM always returns the well known "APM: BIOS not found."-error. Unfortunately, there is no BIOS upgrade available for my motherboard either.

Let me also clarify that this is not a distro-specific problem. My current distro of choice is PCLinuxOS-2007, but I have also tried many different live-cds (including ubuntu 6.06.1 and 7.04, KNOPPIX 5.1.1, SimplyMEPIS 6.5.02, SabayonLinux 3.3b and some more), with exactly the same result.

So, can anyone point me in the right direction with this problem? If it is any help, the output of dmesg (when booting with ACPI, of course) is available here:

http://www.parnet.fi/~tony/dmesg.txt

Any help would be greatly appreciated!

The best help I can offer is that send the boot command linux-noapic when starting up, and it will disable acpi. Now, as far as getting similar function to apm probably can be remedied by looking for software that is compatible with your machine and that particular distro which can do the same job. My assumption is that if windows has it, so do most linux distributions.