theupriser/steamify-cachyos-dev
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docs: run.sh --amd (venus on the AMD iGPU); gaming mode can't render in the VM, all tried

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theupriser committed 2026-09-25 12:54:27 +02:00
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.claude/skills/cachyos-vm-testing/SKILL.md
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@@ -187,6 +187,20 @@ gamescope, so set it back to plasma before the next reboot (below).
## Gamescope does not render in this VM ## Gamescope does not render in this VM
Everything was tried (2026-09-25); don't spend time on it again:
- virgl (default): no Vulkan, black.
- `--vulkan --amd` (venus on the host 780M, RADV): gamescope and Steam run,
but virtio-gpu rejects every framebuffer gamescope makes ("Cannot import FB
to DRM ... not supported for scan-out", AR24 and XR24, also with
`--force-composition --disable-layers`): black. KWin crashes on venus
("Illegal command buffer"), so Plasma freezes too.
- nested gamescope with lavapipe (`vulkan-swrast`): refuses to start, lavapipe
lacks VK_KHR_present_id/present_wait.
- Other hypervisors (VirtualBox, VMware) have no Vulkan at all.
Check gaming mode (Steam's settings, HDMI-CEC section, refresh rates) on the
real Steam Machine. The VM covers everything else.
(Also after any re-apply that includes the conversion.) (Also after any re-apply that includes the conversion.)
No suitable Vulkan (venus is unstable with the host NVIDIA driver). After No suitable Vulkan (venus is unstable with the host NVIDIA driver). After
run.sh
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@@ -1,9 +1,10 @@
#!/bin/bash #!/bin/bash
# CachyOS test VM for steamify.sh. # CachyOS test VM for steamify.sh.
# [REPO=/path/to/cachyos-gamescope-boot] ./run.sh [install] [--nvidia] [--vulkan] [--fremont] # [REPO=/path/to/cachyos-gamescope-boot] ./run.sh [install] [--nvidia] [--vulkan] [--amd] [--fremont]
# install boot the installer ISO # install boot the installer ISO
# --nvidia render the guest's virtio-gpu (virgl) on the host NVIDIA dGPU # --nvidia render the guest's virtio-gpu (virgl) on the host NVIDIA dGPU
# --vulkan expose Vulkan to the guest (venus; needed by gamescope, can be unstable) # --vulkan expose Vulkan to the guest (venus; needed by gamescope, can be unstable)
# --amd with --vulkan: venus on the host AMD iGPU (RADV) instead of NVIDIA
# --fremont report the Valve Steam Machine's DMI data (for testing the wizard) # --fremont report the Valve Steam Machine's DMI data (for testing the wizard)
# REPO defaults to $HOME/projects/cachyos-gamescope-boot. # REPO defaults to $HOME/projects/cachyos-gamescope-boot.
# BIOS_VERSION=F7F0107 makes the guest report that BIOS version (DMI), e.g. # BIOS_VERSION=F7F0107 makes the guest report that BIOS version (DMI), e.g.
@@ -26,6 +27,7 @@ for arg in "$@"; do
--nvidia) export __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia \ --nvidia) export __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia \
__EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/10_nvidia.json ;; __EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/10_nvidia.json ;;
--vulkan) gpu+=,hostmem=4G,blob=true,venus=true ;; --vulkan) gpu+=,hostmem=4G,blob=true,venus=true ;;
--amd) export VK_DRIVER_FILES=/usr/share/vulkan/icd.d/radeon_icd.json ;;
--fremont) smbios+=(-smbios type=1,manufacturer=Valve,product=Fremont -smbios type=2,manufacturer=Valve,product=Fremont) ;; --fremont) smbios+=(-smbios type=1,manufacturer=Valve,product=Fremont -smbios type=2,manufacturer=Valve,product=Fremont) ;;
*) echo "unknown argument: $arg" >&2; exit 1 ;; *) echo "unknown argument: $arg" >&2; exit 1 ;;
esac esac