Phenomic Posted February 21, 2011 Posted February 21, 2011 (edited) Apparently Windows 2000 and 2003 do not support High Precision Event Timer. Device Manager shows Code 28, but I've never seen "Unknown device" for this on new mobos. This one is a new AMD 880G + SB850.PNPDeviceID : ACPI\PNP0103\4&356479D3&0Any ideas? Edited February 26, 2011 by Phenomic
ricktendo Posted February 21, 2011 Posted February 21, 2011 Intel Chipset drivers have a driver for this
Sp0iLedBrAt Posted February 21, 2011 Posted February 21, 2011 (edited) A google search of the Hardware ID shows that it corresponds to Atheros AR5xxx/AR9xxx Wireless driver;However, this http://en.wikipedia....ion_Event_Timer says Windows XP, SP2 knows the HPET timer (as a device with PNP0103 identifier). When detected (for example, on Intel DQ45CB motherboard), Device Manager (START / SETTINGS / CONTROL_PANEL / SYSTEM / DEVICE_MANAGER) shows "High Precision Event Timer" device in "System devices" branch. But this device has no driver and is not used at all.andOlder operating systems do not support HPET and can only use older timing facilities, such as the programmable interval timer or the real-time clock.. Edited February 21, 2011 by Sp0iLedBrAt
Phenomic Posted February 21, 2011 Author Posted February 21, 2011 Thank you, this mobo does indeed have an Atheros AR9285 Wireless Network Adapter in a mini PCI-E slot, but it already has a driver and works just fine. This ACPI\PNP0103 seems like a dummy device because if I offer it the dummy "AMD Away" driver it accepts it and the unknown device goes away.
Phenomic Posted February 25, 2011 Author Posted February 25, 2011 Well I'm stumped with this mystery device. It's a Zotax miniITX mobo with AMD 880G+SB850, Win2000 installs just fine but the system is showing huge DPC latency spikes. I can't track it down to any device driver but it doesn't happen in Linux, so that proves that it's a software problem and not hardware/BIOS(?).Funny thing, I didn't notice the latency or any multimedia stuttering BUT it makes my wii remote mouse jump like crazy every few seconds.
Phenomic Posted February 26, 2011 Author Posted February 26, 2011 OK fixedHigh Precision Event Timer -- HPETDevice Not Available ACPI\PNP0103\4&356479D3&0at 0xFED00000-0xFED003FF, for some reason this memory address is not available on this mobo.To fix, I renamed "14140000FFFFFFFF" in:[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\HAL]"14140000FFFFFFFF"=dword:00000010I don't know how HPET got enabled. I used the unofficial Win2k SP5 for this build (does SP5 enable HPET by default?). The "unknown device" in Device MAnager is still there but is harmless. But the DPC latency spikes are gone... fixed! I was getting huge spikes every 10-20 seconds which made my Wiimote jump to the corners of the screen... phew.
AnX Posted July 28, 2015 Posted July 28, 2015 (edited) Here is a fix for the HPET driver on Win2k. It was made by HP to fix the issue in server 2003, but works great under Windows 2000 too. Edited July 28, 2015 by AnX
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