[Bug 107955] AMDGPU driver keeps reloading on hybrid graphics system causing stuttering.

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Sep 17 15:52:26 UTC 2018


--- Comment #15 from Michel Dänzer <michel at daenzer.net> ---
(In reply to Mike Lothian from comment #13)
> hw/xfree86/dri2/dri2.c:    if (drmGetDevice(info->fd, &dev) || dev->bustype
> != DRM_BUS_PCI) {
> hw/xfree86/drivers/modesetting/dri2.c:    info.deviceName =
> drmGetDeviceNameFromFd(ms->fd);
> [...]
> src/amdgpu_dri2.c:      info->dri2.device_name =
> drmGetDeviceNameFromFd(pAMDGPUEnt->fd);

These are only called during X server startup.

> va/drm/va_drm_utils.c:    name = drmGetDeviceNameFromFd(fd);

This should only be called when a video player using VA-API runs standalone,
not via X (or Wayland), and even then only once.

Try running

 sudo perf record -e rpm:rpm_resume --call-graph=dwarf

in a terminal, then do whatever is needed to reproduce the problem, then
interrupt the perf command with Ctrl-C and attach the output of

 sudo perf report --header

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