Lenovo Thinkpad E540

= Hardware information =

Hardware details
= Issues = Lenovo released a new version of the BIOS (version 2.18) which fixes some problems. It is recommended that you update your BIOS to the latest version available. Which problems are fixed by the new version is marked in the corresponding sections.

(see this link for more information). There is a workaround for this problem (see section Workarounds). There is a workaround for this problem (see section Workarounds). There is a workaround for this problem (see section Workarounds). working
 * If the device has an UEFI Firmware version >1.61 it will not resume from suspend
 * After resume from suspend, the Wifi will not connect again.
 * Sometimes, when the device resumes from suspend, the power LED will blink.
 * Sometimes, when the device resumes from suspend, the hotkeys are no longer

= Workarounds =

No Wifi after resume
New BIOS and software versions should fix this problem, so that the workaround below is no longer required. Update your Gentoo system and BIOS to the latest versions available.

When the device resumes from suspend, the Wifi will no longer work. This seems to be a problem with wpa_supplicant, because restarting it fixes it. On Ubuntu distributions, this problem does not occur, so they probably have a patch for it. See this Ubuntu bug report for more information: https://bugs.launchpad.net/ubuntu/+source/gnome-nettool/+bug/1311257.

With this script in your "/etc/pm/sleep.d" folder, you can restart wpa_supplicant after suspend:

After saving the script file, you have to make it executable:

No resume possible (UEFI problem)
New BIOS and software versions should fix this problem, so that the workaround below is no longer required. Update your Gentoo system and BIOS to the latest versions available.

When you open the lid or press a button to resume, the device will not resume. The fan seems to come on, but thats it. You have to hard reset (push the power button for about 5 seconds) to make it work again. To make resume work, you have to turn off "USB 3 Mode" in the UEFI settings (pushing Enter when the laptop starts). The drawback of this method is, of course, that your USB ports will only work in USB 2 mode, which means much slower data transfers.

Blinking power LED after resume
Sometimes, when the device resumes, the power LED will blink instead of stay lit. This can be fixed by resetting the power LED after suspend. To do this, you have to issue the following command as root:

See "Documentation/laptops/thinkpad-acpi.txt" in your kernel source directory for more information.

= Kernel =

= Required packages = Wifi and bluetooth firmware:
 * sys-firmware/iwl7260-ucode
 * sys-firmware/iwl7260-bt-ucode

= Recommended packages = If you are using Xfce4, you can install this package to see the status of your modifier keys (Caps-Lock,Num-Lock):
 * xfce-extra/xfce4-kbdleds-plugin