E520 Fan sometimes not working after switchable-graphic- issue-BIOS-Update [ Edited ]

[Benik3]

What is the connection with fan?

Maybe this topic will be better for you: http://forums.lenovo.com/t5/ThinkPad-Edge/E420s-switchable-graphics-with-opengl/td-p/522927/highligh...

[Benik3]

New bios here (1.22). I tried him, it looks that it work, but now the fignerprint doesn´t wok!

**** it!

[JameZ]

@Benik3,

Try uninstalling the fingerprint reader driver, reboot the laptop then install the driver again and see if it helps.

//JameZ

[Gregi]

I would like to pay attention to this issue !

My E420 sometimes gets quite hot and fan doesn't work. I have to manually switch graphics (doesn't matter from which to which)  to make ventilation system work! When I launch a game, fan starts working, but in desktop, when something make system hotter, fan stays off. Rebooting system also helps, but I use hibernation & sleep modes for most often. BIOS upgrade needed, please get to work on this problem.

[Benik3]

I tried install back v1.20 and still have the problem with fan. It looks, that it isn´t problem with bios, but with drivers

[JameZ]

@Gregi and Benik3,

Ensure you have Lenovo Power Manager and Power Management driver installed.

//JameZ

[Gregi]

---

JameZ wrote:
@Gregi and Benik3,

Ensure you have Lenovo Power Manager and Power Management driver installed.

//JameZ

---

Of course I have, always.

ThinkPad Power Management Driver (1.64.00.00) installed

ThinkPad Power Manager (3.64) installed

They are latest.

[Benik3]

Me too.

[bss]

I have the same problem with the fan. I have notieced if i switch off the discrete graphics, fan speed will stay as it was in the moent i switched the ATI graphics card off. So if the cpu had some load and the fan speed went up and I switched the discrete draphics off, the fan speed would stay the same - running on high rpm. 

On linux I've also noticed that some kind of system temperature is not changing if the discrete graphics if off, thus fan speed not changing - as the system don't notice the change in the temperature.

I still have 1.19 bios version. Do you suggest I update to the newest? Does anyone know if it resolves this issue?

Regards!

[Benik3]

The bios update don´t solve it. I tried v1.20 and 1.22 and it was still the same