HP Pavilion dm4-3005 serious bug BIOS/drivers - ACPI.sys blocks constantly DPC to 3 milliseconds

Some of our users reported problems with the HP Pavilion dm4, Intel i5, portable audio beats, so we bought such a system for the test, a HP Pavilion dm4-3005. The OS is Windows 7 Home Premium 64-bit.

The questions were dropouts sound while using the software and USB audio interfaces that we do.

Now, we have confirmed the questions and analyzed the cause behind it.

The computer suffers from a DPC latency bottleneck, that fires continually in the OS ACPI.sys driver.

("CPD" is a regular work of pilots (Deferred Procedure Call).)

Each DPC planned by each driver must always end quickly (less than 100 microseconds), or it causes a bug which acts as a bottleneck. When a long DPC runs in a driver, all other drivers are often necessarily suspended, for example, on a machine that behaves in the way reported, Windows can not reliable service all the drivers that need to run more often than once every 3-4 milliseconds.

Low latency is necessary for all reception record, DAW, music app, software synth, as well as pro audio interface hardware drivers.

Because of the congestion, they all suffer from heavy sound artifacts more use cases / underallocations for the pilot of the audio interface. This includes our products but also in any other software low latency and USB audio interfaces.

HP Pavilion dm4-3005 has in this way from the factory, and no matter what drivers are disabled or set to date.
I ran all the critical updates for installation of Windows 7 Home Premium 64-bit.

I downloaded and installed all the updates driver from HP support.

Finally, I also downloaded the BIOS update that available to HP support.

I also followed several guides to address these issues, including advice prevailing to disable the driver "ACPI Compliant control method battery" in Device Manager (Edit: filled in the name of the pilot.)

Does not the initial problem.

I guess it's a bug in the BIOS - which has yet to be resolved by HP or their partner of BIOS for this product.

I have the computer factory reset and ready for testing your solution, when it will be available.

As it is now, we must warn our users of these systems because of their unusable latency.

HP is aware of this problem?

Thank you very much

John Engstrom

Developer

Propellerhead Software

Hello world

I have good news for you, dm4-30xx users!

The new BIOS is completed and will be published shortly by HP (need to package configuration file and write the documentation now...). The update of the BIOS version will be the F.0B.

However, I have access to the "raw" version of this new BIOS. I can send it to you if you ask me, but in this case, you will assume any bad use of this file. In this case, please send me your mail by MP.

The official release will not take much time, so I think it's best that you wait.

Best regards!

Tags: Notebooks

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