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101 lines
3.8 KiB
Nix
101 lines
3.8 KiB
Nix
{ lib, ... }:
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{
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imports = [
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../../../common/gpu/nvidia.nix
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../../../common/cpu/intel
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../../../common/pc/laptop/acpi_call.nix
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../.
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];
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hardware = {
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nvidia = {
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prime = {
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intelBusId = "PCI:0:2:0";
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nvidiaBusId = "PCI:1:0:0";
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};
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};
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# is this too much? It's convenient for Steam.
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opengl = {
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driSupport = lib.mkDefault true;
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driSupport32Bit = lib.mkDefault true;
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};
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};
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# Sleep
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# -----
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#
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# The system will not resume from sleep properly while on battery power in
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# either offload mode or sync mode. When it tries to resume, it gets to a
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# state with a cursor in the top left hand side of the panel, the power LED
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# goes from flashing to solid, and thereafter cannot be interacted with (even
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# over SSH) and must be power cycled forcefully. Sometimes it doesn't even
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# finish going to sleep before this behavior kicks in.
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#
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# When on AC, the machine either wakes up from sleep before being asked to
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# (or maybe never gets to sleep state), or it goes into a sleep state and it
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# appears consistently resume properly when it does.
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#
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# But the machine actually sleeps and resumes reliably when tlp is disabled
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# fully or partially. Disabling RUNTIME_PM and AHCI_RUNTIME_PM appears to be
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# enough to allow it to work when tlp is active. I couldn't figure out a
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# more granular way to get it working, despite trying to do a per-device
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# binary search via powertop.
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#
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# My personal configuration to make this work looks like this:
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#
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# {config, lib, ...}:
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#
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# {
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# services.tlp = {
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# settings = {
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# # DISK_DEVICES must be specified for AHCI_RUNTIME_PM settings to work right.
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# DISK_DEVICES = "nvme0n1 nvme1n1 sda sdb";
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#
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# # with AHCI_RUNTIME_PM_ON_AC/BAT set to defaults in battery mode, P51
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# # can't resume from sleep and P50 can't go to sleep.
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# AHCI_RUNTIME_PM_ON_AC = "on";
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# AHCI_RUNTIME_PM_ON_BAT = "on";
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#
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# # with RUNTIME_PM_ON_BAT/AC set to defaults, P50/P51 can't go to sleep
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# RUNTIME_PM_ON_AC = "on";
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# RUNTIME_PM_ON_BAT = "on";
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# };
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# };
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# }
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#
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# I'm thinking this is too aggressive to put into shared config, and folks may
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# be concerned with the hit on battery life.
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#
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# throttled vs. thermald
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# -----------------------
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#
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# NB: the p53 profile currently uses throttled to prevent too-eager CPU
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# throttling. I understand throttled to have been a workaround solution at
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# the time the p53 profile was created (throttled's original name was
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# "lenovo_fix"). thermald would have been preferred if it worked at the
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# time.
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#
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# I read
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# https://wiki.archlinux.org/title/Lenovo_ThinkPad_X1_Carbon_(Gen_6)#Power_management.2FThrottling_issues
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# as saying that thermald is fixed under the circumstance that led to the
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# development of throttled given version 5.12+ of the kernel combined
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# with version 2.4.3+ of thermald. At the time of this writing, the
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# stable NixOS kernel is 5.15 and 2.4.9 of thermald.
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#
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# In the meantime, I also ran the "s-tui" program which can stress test the
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# system, while eyeing up the core temps and CPU frequency under three
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# scenarios: under thermald, under throttled, and with neither. None of the
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# scenarios seem to have massively improved fan behavior, core temps, or
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# average CPU frequency than another. The highest core temp always seems to
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# hover around 90 degrees C, the lowest CPU Ghz around 3.4 on a 3.8Ghz machine.
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#
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# I ended up choosing throttled because subjectively, the fans seem quieter
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# when it's stressed and it allows the average temps to get a degree or two
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# higher when running throttled than when running in the other two scenarios,
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# but still substantially under critical temp.
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services.throttled.enable = lib.mkDefault true;
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}
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