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Lenovo E145: Backlight

Symptoms

The backlight brightness of an Lenovo E145 laptop with a Radeon HD 8240 graphics controller can not be adjusted on Debian. Neither the Fn-F7/Fn-F8 keys are working nor any other interface.

Solution

Force the use of the kernel Radeon driver by installing the (non-free) Radeon firmware.

Background

There are several drivers that may be used by the Linux kernel and the X Windows System. The trick is forcing the correct one, as not all drivers support the backlight.

Lenovo E145: Wireless network

Symptoms

The wireless network adapter on Lenovo E145 laptops is not supported out of the box on Debian. Though you can see the PCI device (using lspci), you do not have a wireless interface (as checked with ifconfig -a, for example).

Lenovo E145: Swap Function and Ctrl keys

Symptoms

The <Fn> key on this laptop is at the place most experienced keyboard users would expect the <Ctrl> key to be.

Solution

You can swap both keys around by a BIOS setting. This may be a bit confusing for others who want to use your computer, though. This also works properly in Linux.

Procedure

Enter the BIOS setup.

Lenovo E145: Function keys

Symptoms

Function keys do not seem to work properly. Perhaps they so very unexpected things. This may be very disconcerting if you interrupt normal startup by pressing <enter> and then are unable to select one of the menu options.

Solution

You have to press the <Fn>-button at the same time as the function key in order to use it as a function key.

You can switch this behaviour around by setting a BIOS option.

Procedure

Enter the BIOS setup.

Lenovo E145: Booting a foreign disk

Symptoms

When having replaced your internal laptop disk, already preloaded with Linux, you can not boot it; if you select it in the boot menu, nothing seems to happen and you return to the boot menu almost immediately.

Solution

We have to disable Secure Boot and enable Legacy Boot.

Procedure

Enter the BIOS setup (from the boot menu, you can under App Menu select Setup).

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by Dr. Radut