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# Dell XPS 15 7590
- Mostly copied from 15-9550
## Tested Hardware
- CPU: Intel(R) Core(TM) i9-9980HK
- RAM: 32 GB
- HDD: 1 TiB SSD
- Screen: 15" 4k (3840✕2160)
- Input: Touchscreen and trackpad.
## Firmware Configuration
Not much tweaking of NixOS itself was needed. But we currently cannot automate the firmware setup, so this must be done by hand.
### Before installation
These settings are needed both for booting the final install, and installer itself. Therefore, they must be done first.
- **Disable Secure Boot (but keep UEFI Boot).** Thankfully doing so is as easy as changing any other simple setting.
- **Disable Intel hardware RAID and use AHCI instead.** Intel doesn't seem to provide a working linux driver for this. (If you just have SSD it's pointless and just slows things down needlessly anyways.)
### Wifi
**Wifi does not work with kernels older than 5.1 (firmware not present) or newer** (https://bbs.archlinux.org/viewtopic.php?id=247705)
Update: The 48.ucode causes the Killer wifi card to crash. The iwlfwifi-cc-a0-46.ucode works perfectly. default.nix contains an overlay that removes the offending ucode from the linux-firmware bundle.
```
# Use the systemd-boot EFI boot loader.
boot.loader.systemd-boot.enable = true;
boot.loader.grub = {
device = "nodev";
efiSupport = true;
efiInstallAsRemovable = true;
};
boot.loader.efi.canTouchEfiVariables = true;
boot.kernelPackages = pkgs.linuxPackages_5_1;
```
Disable the `canTouchEfiVariables` after a boot or two to prevent NVRAM wearout.
### After installation
- **Add systemd-boot to UEFI boot list.** The (uneditable anyways) settings mapping drive UUIDs to HD* work fine.
### Optional
- **Update BIOS.** According to Reddit, this helps with battery life.
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