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arch-wiki-md-repo

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All arch-wiki articles in markdown format, updated every two days.

github.com/greg-js/arch-wiki-md-repo

greg-js/arch-wiki-md-repo

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## Contents * [1 Installation](#Installation) * [2 Configuration](#Configuration) * [2.1 Backlight](#Backlight) * [2.2 Fn Keys](#Fn_Keys) * [2.3 Suspend](#Suspend) * [2.4 Video Drivers](#Video_Drivers) * [3 Issues](#Issues) * [3.1 DisplayPort Extenders](#DisplayPort_Extenders) * [3.2 USB](#USB) ## Installation Use the [Installation](/index.php/Installation "Installation") guide. ## Configuration ### Backlight The following kernel options are needed for [ACPI/Backlight](/index.php/Backlight#Kernel_command-line_options "Backlight"): ``` acpi_osi=Linux acpi_backlight=vendor video.use_native_backlight=1 ``` ### Fn Keys Function/Fn keys do not work without the FnLock on. To enable the FnLock, press `Fn+Esc`. The green light on the `Fn` key should turn on. Now you can use the `Fn` key like normal (*i.e.*, with FnLock on `Fn+F1` would equate to a `XF86AudioMute` to be handled by X/WM/whathaveyou). ### Suspend Add the following kernel parameter in order to combat freeze/panic after suspend-to-ram: ``` i915.enable_rc6=0 ``` ### Video Drivers Follow [Intel graphics](/index.php/Intel_graphics "Intel graphics") for installing the GPU driver. The T550 suffers from [Intel graphics#Loss of horizontal sync when switching TTYs](/index.php/Intel_graphics#Loss_of_horizontal_sync_when_switching_TTYs "Intel graphics"), but changing the [Graphics Acceleration to UXA](/index.php/Intel_graphics#SNA_issues "Intel graphics") fixes it. ## Issues ### DisplayPort Extenders The T550 is only able to drive three displays at once. If you are using a one-to-three DisplayPort adapter, you will need to disable the laptop display (`xrandr --output eDP1 --off`) in order to use three external displays. Expect a heavy delay (1-2 seconds) while adjusting displays via DisplayPort with `xrandr`. ### USB Enabling "Always-On USB" in the BIOS seems to make the forward-most USB port on the right side of the laptop (the 'Charging Port') unusable in Linux - disabling this feature in BIOS re-enables the port.