| What | Removed | Added |
|---|---|---|
| Component | DRM/AMDgpu | DRM/other |
Comment # 7
on bug 104598
from Michel Dänzer
Thanks, I was finally able to reproduce this. Seems like it's only reproducible if the app runs at >= ~10K FPS. It happens because the client submits so many PresentPixmap requests within a single vertical blank period that the corresponding DRM vblank events fill up the kernel DRM event queue. Then when the compositor sends a PresentPixmap request, the page flip ioctl gets -ENOMEM from drm_event_reserve_init and propagates it. (That the modesetting driver can't deal with this is its bug) Options for addressing this: The kernel might allow queuing page flip events even when the queue is full with vblank events. The xserver present code should be able to re-use a single DRM vblank event for multiple client requests with the same target MSC.
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