Register Location | Fan | Purpose | Min Value | Max Value | Reset | Notes |
---|---|---|---|---|---|---|
0x2E |
CPU | Read Speed | 0x25 |
0xA4 |
N/A | N/A |
0x2F |
CPU | Write Speed | 0x25 |
0xA4 |
0xFF |
N/A |
0x35 |
GPU | Read Speed | 0x25 |
0xA4 |
N/A | N/A |
0x36 |
GPU | Write Speed | 0x25 |
0xA4 |
0xFF |
Will periodically get reset to around 0xB0 when stress testing. |
0x32 |
N/A | Read Temp | 0x20 |
0x53 |
N/A | Seems to be flat 30C - 85C |
The cpu fan would idle at 0x62
which seems like about 15%. The gpu fan would idle at 0xA4
which appeared to be off or very close to it. The gpu fan would be completely off (forced 0xFF
) while on battery power. Trying to write to register 0x27
- 0x34
caused a hard shutdown and the EC thought the computer was in a overheat situation until an EC reset was performed.
More testing needs to be performed if a thermal zone needs to be selected as it was with previous Zbook 15 series. Setting the old registers / values did not seem to have an effect on temperature readings.
Did you notice that this helped solve this issue? I feel like my laptop G3 Zbook tends to get super hot on battery as well. This helped me confirm that there have been other reports or issues similar to mine! Thank you for this documentation!