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Hybrid Intel + NVIDIA boxes enumerate both GPUs. Qt's RHI opens device 0, which is often the iGPU, while Hyprland is compositing on the dGPU. The window maps and never paints. vkEnumeratePhysicalDevices order is not QRhi's order on this box, so an index pin would name the wrong device. When Vulkan lists a GPU that owns no connected DRM connector, restrict VK_DRIVER_FILES to the display GPU's ICD instead. Classic Optimus, where the panel is on Intel, keeps Intel.
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe Vulkan probe now handles partial device enumeration, resolves display GPU PCI IDs, and selects the display GPU ICD for hybrid systems. Qt startup applies the selection unless an operator provides ICD variables. Tests and Rule 5 document the behavior. ChangesVulkan display ICD selection
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant qs_command
participant vulkan_usable
participant display_icd
participant DRM_sysfs
participant VulkanLoader
qs_command->>vulkan_usable: enumerate Vulkan devices
vulkan_usable-->>qs_command: return device PCI properties
qs_command->>display_icd: resolve display GPU ICD
display_icd->>DRM_sysfs: read connected connectors
DRM_sysfs-->>display_icd: return display GPU identifiers
display_icd-->>qs_command: return ICD path
qs_command->>VulkanLoader: set VK_DRIVER_FILES and VK_ICD_FILENAMES
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✅ Passed checks (4 passed)
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Inline comments:
In `@src/vulkan.rs`:
- Around line 160-162: Update the vkEnumeratePhysicalDevices result check to
accept both VK_SUCCESS and VK_INCOMPLETE, preserving the populated handles and
filled count; only return the existing error for other result codes.
- Around line 192-196: Update icd_search_dirs() to use userfile::env_dir for
XDG_CONFIG_HOME and HOME, treating empty environment variables as unset and
preserving the fallback to $HOME/.config/vulkan/icd.d. Ensure no relative
vulkan/icd.d path is added when XDG_CONFIG_HOME is empty.
- Around line 357-363: Update the Vulkan hardware test around usable and
display_pci_ids to return early when no DRM connectors are present, then skip
only the explicit usable outcomes indicating a missing loader or no Vulkan
devices. Keep successful enumeration assertions intact and allow instance,
extension, enumeration, and Vulkan/display mismatch errors to remain fatal.
- Around line 169-170: Align the buffer used by the GetPhysicalDeviceProperties
call to 8 bytes while preserving its existing byte size and raw-pointer API.
Update the local buffer declaration near get(handle, buf.as_mut_ptr()) so the
driver’s typed VkPhysicalDeviceProperties write is performed on suitably aligned
storage.
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AGENTS.mdsrc/gui.rssrc/vulkan.rstests/modes.sh
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vkEnumeratePhysicalDevices can return VK_INCOMPLETE after the count grows; those handles are still valid. Treating that as failure dropped hybrid boxes to OpenGL. The properties buffer is now 8-byte aligned, empty XDG_CONFIG_HOME is absent the way userfile::env_dir already treats it, and the live PCI test skips a headless box instead of panicking.
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Problem
On hybrid Intel + NVIDIA Omarchy laptops, Flea opens a mapped window that never paints (it looks like a black/empty file manager).
Hyprland composites on the GPU that owns the connected panel. Qt's Vulkan RHI opens physical device 0, which is often the iGPU. The compositor cannot import that buffer.
This was reproduced on an ASUS ROG with Raptor Lake UHD + RTX 4080 Max-Q: Hyprland's primary DRM device is NVIDIA (
DP-1/eDP-1oncard1), while QRhi logged:Forcing
VK_ICD_FILENAMEStonvidia_icd.jsondraws the listing. Forcing the NVIDIA ICD on every NVIDIA laptop would blank classic Optimus, where the compositor sits on Intel.Why not
QT_VK_PHYSICAL_DEVICE_INDEXvkEnumeratePhysicalDeviceson this box lists NVIDIA then Intel. QRhi lists Intel then NVIDIA. An index from Flea's probe would point Qt at the other GPU.Fix
The existing Vulkan probe now also reads each device's PCI id and matches it against
/sys/class/drmconnectors whosestatusisconnected.When Vulkan lists both a display GPU and one that owns no connector, Flea sets
VK_DRIVER_FILESandVK_ICD_FILENAMESto the ICD whoselibrary_pathbelongs to the display GPU, and says so once on stderr.VK_DRIVER_FILES/VK_ICD_FILENAMESare left alone (empty is absent).intel_hasvkis skipped when the modern Intel ICD is the display GPU.Tests
library_path, vendor matching, and the hybrid vs Optimus vs single-GPU pin rule.tests/modes.shasserts the automatic renderer still starts on Vulkan, pins an ICD on a hybrid box, preserves an explicit ICD list, and still falls back to OpenGL when the loader cannot create an instance (issue Vulkan-only startup leaves invisible processes on GPUs without Vulkan support #14).Summary by CodeRabbit
Bug Fixes
Documentation