Then reboot immediately to finish the upgrade. Extract the zip file, then use fwupd to update the firmware: Once done, you can flash the Non-Absolute Persistence (P version) with the same instructions.ĭownload the zip file labelled "BIOS Update Utility (Linux)" from Lenovo's support website or directly. To install the Non-Absolute Persistence BIOS, you must first permanently disable Computrace in the BIOS. The Non-Absolute version is included in the zip file containing BIOS updates from Lenovo's website or you can directly download it from. Versions ending in W include Absolute's features and versions ending in P remove it. The BIOS versions are identified by their letter at the end of the. If you do not subscribe to this service and have no use for it, you can flash an alternate BIOS provided by Lenovo listed as "Non-Absolute Persistence". More information about its functionality and vulnerabilities can be read here Absolute Home & Office (originally known as CompuTrace, and LoJack for Laptops) is a proprietary laptop theft recovery software (laptop tracking software) with features including the abilities to remotely lock, delete files from, and locate the stolen laptop on a map. Lenovo offers two BIOS versions with their releases Absolute Persistence and Non-absolute Persistence. Warning: Switching to and flashing the Non-Absolute Persistence BIOS (Versions ending in P) is permanent and irreversible. All information on this page should assume the latest BIOS unless explicitly stated otherwise. The latest BIOS version is highly recommended. If you have issues with a gigabit connection being capped at 100 MB/s and you are using the e1000e driver, try adding pcie_aspm=off to the kernel boot parameters.Īdditionally, run the following to get a more slight network performance improvement:Įthtool -s autoneg on speed 1000 duplex fullīIOS and firmware updates are available via fwupd, the Lenovo Vantage application on Windows, or from Lenovo's website. Workarounds are to completely shutdown the machine (no suspend or reboot), on next boot it works for me.Īlternatives suggested are to first boot into windows, and/or disable windows fastboot in the bios. If your WiFi card is occasionally not detected after reboots, this may be related to a known bug that is related to windows fastboot. More details on what this does at BBS#229349. etc/modprobe.d/nf options psmouse synaptics_intertouch=0 If you are having issues with trackpad functionality not working after a sleep and resume, like non-smooth tracking or tap clicking not registering, you can switch back to the older communication protocol: See Firmware to check your current version and upgrade. This is resolved with system firmware version 1.30. There is an issue with keystrokes being skipped at times ( see the Lenovo forums). Keys might need to be bound using a tool like xbindkeys. "Discrete Graphics" selected in BIOS).īrightness control can be controlled with xbacklight. If you notice brightness controls cease working, check that your BIOS settings are still for "Hybrid Graphics" and not "Discrete Graphics".ĭiscrete graphics means only the Nvidia GPU is available to the system (i.e. Hybrid Graphics (also known as Nvidia Optimus) Allows the system to use the integrated Intel graphics and the Nvidia GPU interchangeably without rebooting.īrightness control under Hybrid Graphics should work "out of the box" with no kernel command line options necessary. etc/modprobe.d/nf options i915 enable_dpcd_backlight=1Īlternatively, you can add it as a kernel parameter:īrightness control is not yet supported by standard tools. Instead, it can be controlled using PWM by enabling following option: OLED screens have no backlight, brightness cannot be controlled by changing backlight power in the traditional way. VideoĪs of Linux 5.2.9, the Nouveau driver can cause quite a lot of kernel panics when using the webcamera. Note: You can also build the battery module into your kernel.
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