As the dmesg files are a bit large i print the diff beetween dmesg.1 (with piixpm driver) and dmesg.2 (with piixpm driver disabled). OpenBSD version is 7.3:
gordo$ diff dmesg.1 dmesg.2
4c4
< avail mem = 7740280832 (7381MB)
---
> avail mem = 7740272640 (7381MB)
31c31
< cpu1: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.57 MHz, 15-65-01
---
> cpu1: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.55 MHz, 15-65-01
37c37
< cpu2: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.54 MHz, 15-65-01
---
> cpu2: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.57 MHz, 15-65-01
43c43
< cpu3: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.55 MHz, 15-65-01
---
> cpu3: AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G, 2395.58 MHz, 15-65-01
144,149c144
< piixpm0 at pci0 dev 20 function 0 "AMD FCH SMBus" rev 0x4a: SMI
< iic0 at piixpm0
< spdmem0 at iic0 addr 0x50: 4GB DDR4 SDRAM PC4-17000 SO-DIMM
< spdmem1 at iic0 addr 0x51: 4GB DDR4 SDRAM PC4-17000 SO-DIMM
< iic1 at piixpm0
< iic1: addr 0x4c 3e=00 48=00 4a=00 4e=00 fc=00 fe=00 words 00=ffff 01=ffff 02=ffff 03=ffff 04=ffff 05=ffff 06=ffff 07=ffff
---
> "AMD FCH SMBus" rev 0x4a at pci0 dev 20 function 0 not configured
gordo$
The only visible difference is the information about the DIMM stick memory.
When piixpm driver is disabled the fan is quiet. When piixpm is enabled the fan is noisy. I print the sysctl hw for looking at the temperature (5 minutes after relinking the kernel after each boot). hw.1 is with piixpm driver enabled and hw.2 with piixpm driver disabled:
gordo$ cat hw.1
hw.machine=amd64
hw.model=AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G
hw.ncpu=4
hw.byteorder=1234
hw.pagesize=4096
hw.disknames=sd0:,cd0:,sd1:0f83462aa1310264
hw.diskcount=3
hw.sensors.cpu0.frequency0=1150000000.00 Hz
hw.sensors.cpu2.frequency0=1100000000.00 Hz
hw.sensors.acpibat0.volt0=14.60 VDC (voltage)
hw.sensors.acpibat0.volt1=15.37 VDC (current voltage)
hw.sensors.acpibat0.current0=unknown (rate), UNKNOWN
hw.sensors.acpibat0.amphour0=2.64 Ah (last full capacity)
hw.sensors.acpibat0.amphour1=0.13 Ah (warning capacity)
hw.sensors.acpibat0.amphour2=0.08 Ah (low capacity)
hw.sensors.acpibat0.amphour3=2.08 Ah (remaining capacity), OK
hw.sensors.acpibat0.amphour4=2.85 Ah (design capacity)
hw.sensors.acpibat0.raw0=1 (battery discharging), OK
hw.sensors.acpibat0.raw1=0 (discharge cycles)
hw.sensors.acpiac0.indicator0=Off (power supply)
hw.sensors.acpibtn1.indicator0=On (lid open)
hw.sensors.acpitz0.temp0=45.00 degC (zone temperature)
hw.sensors.acpitz1.temp0=20.00 degC (zone temperature)
hw.cpuspeed=1200
hw.setperf=0
hw.vendor=HP
hw.product=HP Notebook
hw.version=Type1ProductConfigId
hw.serialno=CND7150PJR
hw.uuid=18fb567c-19a5-11e7-b753-3c5282b47d92
hw.physmem=8002203648
hw.usermem=8002187264
hw.ncpufound=4
hw.allowpowerdown=1
hw.perfpolicy=auto
hw.smt=0
hw.ncpuonline=2
hw.power=0
gordo$
gordo$ cat hw.2
hw.machine=amd64
hw.model=AMD A10-9600P RADEON R5, 10 COMPUTE CORES 4C+6G
hw.ncpu=4
hw.byteorder=1234
hw.pagesize=4096
hw.disknames=sd0:,cd0:,sd1:0f83462aa1310264
hw.diskcount=3
hw.sensors.cpu0.frequency0=1150000000.00 Hz
hw.sensors.cpu2.frequency0=1100000000.00 Hz
hw.sensors.acpibat0.volt0=14.60 VDC (voltage)
hw.sensors.acpibat0.volt1=14.89 VDC (current voltage)
hw.sensors.acpibat0.current0=unknown (rate), UNKNOWN
hw.sensors.acpibat0.amphour0=2.64 Ah (last full capacity)
hw.sensors.acpibat0.amphour1=0.13 Ah (warning capacity)
hw.sensors.acpibat0.amphour2=0.08 Ah (low capacity)
hw.sensors.acpibat0.amphour3=1.77 Ah (remaining capacity), OK
hw.sensors.acpibat0.amphour4=2.85 Ah (design capacity)
hw.sensors.acpibat0.raw0=1 (battery discharging), OK
hw.sensors.acpibat0.raw1=0 (discharge cycles)
hw.sensors.acpiac0.indicator0=Off (power supply)
hw.sensors.acpibtn1.indicator0=On (lid open)
hw.sensors.acpitz0.temp0=25.00 degC (zone temperature)
hw.sensors.acpitz1.temp0=20.00 degC (zone temperature)
hw.cpuspeed=1200
hw.setperf=0
hw.vendor=HP
hw.product=HP Notebook
hw.version=Type1ProductConfigId
hw.serialno=CND7150PJR
hw.uuid=18fb567c-19a5-11e7-b753-3c5282b47d92
hw.physmem=8002203648
hw.usermem=8002187264
hw.ncpufound=4
hw.allowpowerdown=1
hw.perfpolicy=auto
hw.smt=0
hw.ncpuonline=2
hw.power=0
gordo$
