It's a definitive bug in the driver...
I installed a new system with Windows 7 Home Premium 64bit (Gigabyte GA-H87-D3H newest bios, Intel Core i7-4770).
CPU-Usage abolutely flatlined.... then the first and only thing i installed was the 3345-Driver.
Suddenly an increase on Core0 to 60-80% Usage, permanently! Sluggish System behaviour.
Processmonitor => Usage comes from interrupts/dpc
Uninstalled driver.... immediately flatlined again.
Installed older driver.... still flatlining and everything running smoothly.
Since i7-4770 has 4 cores with hyper-threading (8 threads in total), close to 85% CPU usage in one core (thread) would result in roughly 10.625% (85%/8) total CPU usage in resource manager.
I also have similar high CPU usage problem with the newest 3345 driver under Win 7 64 bit which I suspect is due to some problem related to the HDMI part of the driver. The Intel HDMI audio device is gone missing from the device manager with the newest 3345 driver whereas the old 3257 driver does not have this problem.
Reply with information of the graphics report and DirectX diagnostic report as well. I will send the information to our engineering department and check if they have this issue already reported with the latest video drivers.
click Start, click Run, type dxdiag in the Open box, and then click OK.
I have the same problem on MSI H87-G43 (BIOS V2.6) mainboard with i5-4440 (Intel HD 4600).
Any newer driver than 3257 (I tested 3345, 3325, 3277) causes 10-12% CPU used
by system interrupts. I also find out that when put system on sleep (S3) and
wake up again the CPU peak flattened, after restart the peaks appears again. I
also noticed that with all newer drivers the Intel Display Audio disappeared from
Windows 7 64bit
i have the same Problem !
i have a asrock h87 pro4 and installed HD4600 Driver from CD , it was 18.104.22.16886 Driver.
than i updated the Graphics Driver from Intel Support Detect. 10.18.10.3345
after Reboot i see High CPU 25% without any work on the PC, Process Explorer show High System Interrups .
i deinstalled this Driver and go back to the Mainboard CD Driver , the High System Interrups was gone...
Will Intel fix this Problem ?
I can confirm it too. I have the same specs as HansCZ. Also I launched LatencyMon to see which driver is generating interrupts. It seems that USBPORT.SYS is the culprit on my system. But I didn't have this problem until I updated the drivers. When idle cpu usage is 12~18% on core 0. Going to sleep and back kicks cpu usage down to 0%.