mirror of
https://github.com/NixOS/nixos-hardware
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124 lines
5.2 KiB
Markdown
124 lines
5.2 KiB
Markdown
# NOTE: Structure changes from 2023-01-10
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Please read the [Deprecated Behaviour README](./OLD-BEHAVIOUR-DEPRECATION.md) to understand how some structural changes to
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the code might affect you!
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# Derivations for Microsoft Surface notebooks
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These derivatives use the patches from the [linux-surface repo](https://github.com/linux-surface/linux-surface/tree/master/patches).
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## Importing
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By preference, there will already be a specialised module for your model's configuration.
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e.g. The `microsoft/surface/surface-go` module configures for the Surface Go.
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If not, the `microsoft/surface/common/` module can also be imported directly, and the options
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provided can be used in your own system's configuration.
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Alternatively, you can create a new specialisation for your model under `microsoft/surface`
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configured for that model.
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## Common Modules
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Most shared / common modules are under the [`common/`](./common/) directory.
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This includes the patched kernel build modules, as well as tools and service like `IPTSd` and `surface-control`.
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### Kernel
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The kernel needs several patches to make it work correctly with some of the hardware on various
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Surface models, e.g. keyboard/trackpad, camera, wifi.
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Not all hardware is fully supported, but the
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[linux-surface feature matrix](https://github.com/linux-surface/linux-surface/wiki/Supported-Devices-and-Features#feature-matrix)
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provides details on which devices are supported on which types of machine.
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The kernel-specific derivations are under the [`common/kernel/`](./common/kernel/) sub-directory.
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In order to simplify maintenance of the Nix code, only the most-recent kernel patch-set is expected
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to be maintained in this repo.
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_*NOTE:*_ Some built-in Kernel config items need to be set, that aren't set by default:
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- https://github.com/linux-surface/surface-aggregator-module/wiki/Testing-and-Installing
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### Support Tools
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### IPTS
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Enable this with the `microsoft-surface.ipts.enable = true;` config option.
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IPTS is used on most of the Surface range, except for Surface Go and Surface Laptop 3 (AMD version).
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Older kernels used specialised firmware which used a method that's no longer supported by the
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more-recent kernels.
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Newer kernels use the kernel-space `intel-precise-touch` driver and user-space `ipstd` daemon.
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The `iptsd` daemon works with the `intel-precise-touch` driver to convert raw touch data from the
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kernel-space driver into events for the HID / input sub-system.
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- https://github.com/linux-surface/iptsd
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- https://github.com/linux-surface/intel-precise-touch
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- _*NOTE:*_ The patches from this repo are included in the above kernel patches, already.
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### DTX, `surface-control`
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#### surface-control
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Enable this with the `config.microsoft-surface.surface-control.enable = true;` config option.
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For controlling the performance modes and other aspects of the device, the [`surface-control`](https://github.com/linux-surface/surface-control) tool is included.
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To be able to control the performance mode without using `sudo`, add your user to the `surface-control` group.
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## Firmware and Drivers
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### WiFi on Surface Go
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For the Surface Go, please see the "Issues" sections below.
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Including the [`microsoft/surface/surface-go/firmware/ath-10k/`](./surface-go/firmware/ath-10k/)
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module will replace the default firmware with the updated firmware.
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# ToDo's Not Done
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See: [TODO.org](./TODO.org)
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# Issues
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## TLP daemon
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TLP is known to cause problems on Surface unless correctly configured.
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See: https://github.com/linux-surface/linux-surface/blob/master/README.md
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## Wifi Firmware for Surface Go
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On the Surface Go, the standard firmware from the official Linux Firmware repo has issues with the
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`ath10k` QCA6174 Wifi device.
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You will see messages like "Can't ping firmware".
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The most effective fix to-date is to remove the `board-2.bin` file or replace it with a copy of the
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`board.bin` file.
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The derivative in `surface-go/firmware/ath10k/` can configure this, with the
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`config.hardware.microsoft-surface.firmware.surface-go-ath10k.replace = true` config option.
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_*NOTE:*_ This is destructive, as it deletes all the `board.bin` and `board-2.bin` files for the
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`ath10k` QCA6174 device, and replaces them with KillerNetworking's version.
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This is the only way (currently) to force the driver to use the new firmware.
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For more details, see: https://github.com/linux-surface/linux-surface/wiki/Surface-Go#wifi-firmware
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_*NOTE:*_ There's some work to patch the kernel to make it easier to override which firmware file
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to use for QCA6174, which would obviate this more-destructuve approach:
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- https://github.com/linux-surface/kernel/commit/22ef83836c4aa89e9eb98de9b47ed24b6c2a1d45
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_*NOTE:*_ There was an attempt to get this firmware incorporated into the aggregate `board-2.bin`,
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but (as of this writing) the request appears to have been ignored:
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- https://github.com/linux-surface/linux-surface/issues/41
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References:
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- https://github.com/jakeday/linux-surface/issues/441
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- https://www.reddit.com/r/SurfaceLinux/comments/e8quqg/surface_go_official_wifi_fix/
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- https://hackmd.io/@dasgeek/ryA5i5Dor
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- https://github.com/thebitstick/surfacego-wifi
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- https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/ath10k
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- https://wireless.wiki.kernel.org/en/users/drivers/ath10k/firmware
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