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l 1. The USB fingerprint device, which supports Selective suspend (the device enters suspend after 5 seconds), but we found that the driver of the DFx feature has more power consumption than the unsupported DFx driver .
The situation is as follows: (The yellow part is what we have doubts about)
l Q2. Why are the power saving behaviors different between *manual enter S3(Start menu -> power -> sleep) and*command (.\pwrtest.exe /directedfx /device”xxxx”)?
l Q3. According to the above, in the specification of power consumption measurement, Which one should be the main one? (Manual enter S3 or use command enter S3)
l Q4. Does Microsoft have a DFx power consumption spec?
Continue reading...
The situation is as follows: (The yellow part is what we have doubts about)
| Before Driver | Support DFx Driver | |||
| Is there a registered finger | OS send capture data IOCTL | Status | Status | |
| Enrolling fingerprint | Yes | Yes | Power consumption drops after 5 seconds. | Continuous power consumption |
| No | Yes | Power consumption drops after 5 seconds. | Continuous power consumption | |
| Lock screen | Yes | Yes | Power consumption drops after 5 seconds. | Continuous power consumption |
| No | No | Power consumption drops after 5 seconds. | Power consumption drops after 5 seconds. | |
| S3 (modern standby) | Yes | Yes | Power consumption drops after 5 seconds. | *Manual enter S3: Power consumption drops after 60 seconds. *use command enter S3: Power consumption drops after 5 seconds. |
| No | No | Power consumption drops after 5 seconds. | Power consumption drops after 5 seconds. |
l Q2. Why are the power saving behaviors different between *manual enter S3(Start menu -> power -> sleep) and*command (.\pwrtest.exe /directedfx /device”xxxx”)?
l Q3. According to the above, in the specification of power consumption measurement, Which one should be the main one? (Manual enter S3 or use command enter S3)
l Q4. Does Microsoft have a DFx power consumption spec?
Continue reading...