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🐛 profiles/graphic_drivers: skip early KMS for eGPUs #227

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🐛 profiles/graphic_drivers: skip early KMS for eGPUs #227

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🐛 profiles/graphic_drivers: skip early KMS for eGPUs
christophsanz Mar 16, 2026
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remove useless branches
christophsanz Mar 28, 2026
d9b3093
Update profiles/pci/graphic_drivers/profiles.toml
christophsanz Mar 28, 2026
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52 changes: 50 additions & 2 deletions profiles/pci/graphic_drivers/profiles.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -48,10 +48,34 @@ conditional_packages = """

"""
pre_install = """
cat <<EOF >/etc/mkinitcpio.conf.d/10-chwd.conf
# Enable early KMS for non-removable NVIDIA GPUs.
# Removable GPUs (Thunderbolt, USB4) aren't available during initramfs,
# so loading these modules early causes Xid errors and no display output.
for dev in /sys/bus/pci/devices/*; do
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@ventureoo ventureoo Mar 22, 2026

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I think iterating over /sys/class/drm/*/device will be faster and allows to get rid of class id check in the loop.

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for dev in /sys/bus/pci/devices/*; do
for dev in /sys/class/drm/*/device; do

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@christophsanz christophsanz Mar 28, 2026

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I don't think the device will be present in /sys/class/drm/ when the driver is not installed right?

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@ventureoo ventureoo Mar 28, 2026

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If NVIDIA driver is not installed, then kernel simply fallbacks to nouveau, which is still creates drm device. It is theoretically possible when no driver is loaded, but I am not sure if we should handle it here.

vendor="$(cat "$dev/vendor" 2>/dev/null)"
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@ventureoo ventureoo Mar 22, 2026

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I think 2>/dev/null is redudant here?

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@christophsanz christophsanz Mar 28, 2026

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It probably is, but i'd figured it wont hurt either.

class="$(cat "$dev/class" 2>/dev/null)"

# Only check NVIDIA (0x10de) display devices
if [ "$vendor" != "0x10de" ]; then
continue
fi

case "$class" in
0x0300*|0x0302*|0x0380*) ;; # VGA, 3D, or display controller
*) continue ;;
esac

# Skip removable GPUs (eGPU via Thunderbolt, USB4, etc.)
if [ "$(cat "$dev/removable" 2>/dev/null)" = "removable" ]; then
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continue
fi

cat <<EOF >/etc/mkinitcpio.conf.d/10-chwd.conf
# This file is automatically generated by chwd. PLEASE DO NOT EDIT IT.
MODULES+=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)
EOF
break
done

# Remove kms hook from mkinitcpio.conf on desktops
device_type="$(cat /sys/devices/virtual/dmi/id/chassis_type)"
Expand Down Expand Up @@ -126,10 +150,34 @@ conditional_packages = """

"""
pre_install = """
cat <<EOF >/etc/mkinitcpio.conf.d/10-chwd.conf
# Enable early KMS for non-removable NVIDIA GPUs.
# Removable GPUs (Thunderbolt, USB4) aren't available during initramfs,
# so loading these modules early causes Xid errors and no display output.
for dev in /sys/bus/pci/devices/*; do
vendor="$(cat "$dev/vendor" 2>/dev/null)"
class="$(cat "$dev/class" 2>/dev/null)"

# Only check NVIDIA (0x10de) display devices
if [ "$vendor" != "0x10de" ]; then
continue
fi

case "$class" in
0x0300*|0x0302*|0x0380*) ;; # VGA, 3D, or display controller
*) continue ;;
esac

# Skip removable GPUs (eGPU via Thunderbolt, USB4, etc.)
if [ "$(cat "$dev/removable" 2>/dev/null)" = "removable" ]; then
continue
fi

cat <<EOF >/etc/mkinitcpio.conf.d/10-chwd.conf
# This file is automatically generated by chwd. PLEASE DO NOT EDIT IT.
MODULES+=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)
EOF
break
done

# Remove kms hook from mkinitcpio.conf on desktops
device_type="$(cat /sys/devices/virtual/dmi/id/chassis_type)"
Expand Down