diff options
Diffstat (limited to 'roles/nvidia_gt750m')
| -rw-r--r-- | roles/nvidia_gt750m/tasks/main.yml | 52 |
1 files changed, 42 insertions, 10 deletions
diff --git a/roles/nvidia_gt750m/tasks/main.yml b/roles/nvidia_gt750m/tasks/main.yml index 1a78f985..7e0fee2b 100644 --- a/roles/nvidia_gt750m/tasks/main.yml +++ b/roles/nvidia_gt750m/tasks/main.yml @@ -1,19 +1,51 @@ --- -# The GT 750M (GK107M, Kepler) runs under the nouveau open-source driver on Linux. -# Nouveau does not perform automatic GPU reclocking on Kepler — it boots at the -# lowest power state (AC: ~405 MHz core / ~680 MHz memory) and stays there. -# This causes severe lag under Wayland compositors (Hyprland) even on simple -# tasks like switching windows, because the GPU is starved of bandwidth. +# The GT 750M (GK107M, Kepler architecture) runs under the nouveau open-source +# driver on Linux. Nouveau does not perform automatic GPU reclocking on Kepler — +# it boots at the lowest power state (AC: ~405 MHz core / ~680 MHz memory) and +# stays there. This causes severe lag under Wayland compositors (Hyprland) even +# on simple tasks like switching windows, because the GPU is starved of bandwidth. # # The fix is to force the highest performance state (0f: 925 MHz core / 5016 MHz # memory) via the nouveau DRM pstate sysfs interface. We do this with a udev rule # that fires the moment nouveau initializes the GPU's DRM device. # -# We intentionally do NOT install the proprietary nvidia-470xx-dkms driver because: -# - nvidia-470xx + Wayland/Hyprland on Kepler has documented upstream instability -# - External monitors are wired to NVIDIA outputs; without a working Wayland stack -# the setup is unusable -# - nouveau with forced pstate provides acceptable performance for desktop use +# WHY NOT nvidia-470xx-dkms (proprietary driver): +# +# Using the proprietary NVIDIA driver with Hyprland/Wayland on this GPU is +# architecturally impossible — not a configuration problem, but a fundamental +# driver limitation: +# +# - Wayland compositors (Hyprland, sway/wlroots) use GBM (Generic Buffer +# Management) — the standard Linux/Mesa buffer allocation mechanism — to +# allocate GPU framebuffers for display. +# +# - The nvidia-470xx driver only supports EGL Streams, NVIDIA's proprietary +# alternative to GBM. NVIDIA added GBM support starting with driver 510+ +# (released 2022), but only for Pascal (GTX 10xx) and newer GPUs. +# +# - The 470xx branch is a legacy/frozen branch for Kepler (GT 6xx/7xx). It +# predates the GBM work and will never receive it — NVIDIA officially +# classified Kepler as legacy and ceased feature development. +# +# - wlroots (the compositor library Hyprland is built on) evaluated adding +# EGL Streams support (PR #2769) but abandoned it because NVIDIA was the +# only vendor requiring it. It will never be implemented. +# +# - Consequence: Hyprland asks for GBM, nvidia-470xx only speaks EGL Streams. +# The compositor crashes at EGL initialization with errors like: +# "does not support GL_EXT_read_format_bgra" and +# "does not support explicit sync via EGL_ANDROID_native_fence_sync". +# (Confirmed: joanbm/nvidia-470xx-linux-mainline issue #11, June 2026; +# Hyprland issue #1302; omarchy discussion #4122, January 2026) +# +# - nvidia and nouveau cannot coexist on the same device — they are mutually +# exclusive kernel modules. There is no hybrid mode possible. +# +# - nvidia-470xx reached End of Life. No further feature development. +# Only security/kernel compatibility patches are backported. +# +# CONCLUSION: nouveau is the only viable driver for Hyprland on this GPU. +# The pstate fix below is the correct and only approach to improve performance. - name: "Force nouveau pstate to maximum on GT 750M" become: true ansible.builtin.template: |