noway149

NBFC seems like it could somehow do it, but the preexisting config files for other Sony notebooks didn't work. I followed the manual to create my own config file, in spite of the warnings, but I could find only one register, 88, that made sense to be the fan speed, seemingly the read register, in RW. There was no register with similar value. The register right next to it, 89, did change around a lot, but those changes were seemingly random. The only registers with similar values to each other were 0, 1 and 2, but they didn't fit to be the fan speed, so my best guess is that they are temperature readings. I also tried doing everything plugging in and on battery, because I heard there was a possibility of a BIOS entry like "Fan always on on AC power", but without success. There were some changed offsets in RW for the EC when plugging the laptop in and out, though.

I loaded the default BIOS settings (again), and tried SpeedFan. Sadly neither did work, because SpeedFan is not able to access the fan speed. This seems to be because Sony did not make the way to do it public. I tried to get a configuration from the SpeedFan website, but there is no entry for (any) Sony Vaio motherboard model. I tried out some power management features in a Sony program, but they did not change anything either. Edit: Things that might be interesting: - When I started SpeedFan for the first time, the laptop crashed pretty quick. That could have been coincidence though, because it had been running relatively long at this time. - The Temp1, Core0 and Core1 hover between 60 and 90 °C (relatively fast, average is 70-80), while being at the latter even in idle directly after startup after being turned off for hours. - While using Small FFT in Prime95 temperatures hover between 90 °C and 100 °C. - I already tried cleaning off dust by using a vacuum cleaner held to the vents. Edit+: - After all the things I tried, Prime95 is able to run in Small FFT Mode for at least an hour now (no time to test further today). - The Temperature average kept at 95 °C. - Even when using Prime95, it only uses about 70% of the CPU, System Interrupts is still at about 25%. - When stopping the test, CPU temperature readings instantly go down to about 75 °C. This seems a bit faster than realistic.

I deactivated it, but sadly that was no use. Before, I had already tried starting the laptop without its battery, which didn't resolve the problem either. I then deactivated everything in the device manager that would let me do it (besides the IDE controller), but no change. I searched for "high acpi.sys usage" online and found (some) people saying that for them, the solution was removing a device physically rather than in the device manager, but on a laptop this is a bit difficult. I'm getting desparate enough to try and open it though... Edit: Additionally, others seemed to need to update their BIOS, but in my case it seems there are no updates available for the Insyde H2O BIOS. The only thing I can find is a community hack to get an advanced BIOS/debug menu with more options. I don't know if that would do any good though.

Yes, the Sony Vaio VPCZ13B7E. Which can be pretty annoying driver/software-wise. So what I understand is, it could have a lot of reasons like high temperature etc.?

Hi, I followed your guide because of problems with constant CPU Usage by System Interrupts (about 25-30%) and seemingly random crashes (without BSoD). I needed to change some things in my WPA version to do it, but I found "ntkrnlmp.exe" with either "ntkrnlmp.exe!PspSystemThreadStartup" or, after following down "ACPI.sys!ACPIWorkerThread" to the end, "ntkrnlmp.exe!KeReleaseSpinLock", as the cause(?) of the problem. (See attached image.) I searched online for solutions but was not succesful (seeing as ntkrnlmp.exe is just a windows function, right?). Things I tried without success include: Clean reboot New Graphics driver Deinstallation of AV Trying either of two RAM-sticks alone Memtest86 for 5h (no errors) Prime95 (crash after few seconds of any stress test) scf /scannow (no errors) and probabely some other things. If you or anyone can see anything helpful, I would be very very thankful. I can of course also upload the .etl-file and send it via PM if that would do any good. Vielen Dank im Vorraus und für das Bereitstellen des Guides allein schon!