I can confirm that this patch fixes the problem. (had to change spaces
to tabs, but that was probably just screwed up by mail)
2014-01-30, Ilia Mirkin <imirkin@xxxxxxxxxxxx>:
> Since commit 0fa9061ae8c ("drm/nouveau/mc: handle irq-related setup
> ourselves"), drm_device->irq_enabled remained unset. This is needed in
> order to properly wait for a vblank event in the generic drm code.
>
> See https://bugs.freedesktop.org/show_bug.cgi?id=74195
>
> Reported-by: Jan Janecek <janjanjanx@xxxxxxxxx>
> Signed-off-by: Ilia Mirkin <imirkin@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 3.10+
> ---
>
> TBH, not sure why this fixes things, as irq_enabled == false should have
> caused the vblank wait to not wait, since the condition would be
> immediately true.
>
> Jan, mind double-checking that this version of the patch fixes things
> for you? Not 100% sure where you stuck the irq_enabled=true line when you
> tried it out.
>
> drivers/gpu/drm/nouveau/nouveau_drm.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c
> b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index bfd02410..3ba7b62 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -376,6 +376,8 @@ nouveau_drm_load(struct drm_device *dev, unsigned long
> flags)
> if (ret)
> goto fail_device;
>
> + dev->irq_enabled = true;
> +
> /* workaround an odd issue on nvc1 by disabling the device's
> * nosnoop capability. hopefully won't cause issues until a
> * better fix is found - assuming there is one...
> @@ -475,6 +477,7 @@ nouveau_drm_remove(struct pci_dev *pdev)
> struct nouveau_drm *drm = nouveau_drm(dev);
> struct nouveau_object *device;
>
> + dev->irq_enabled = false;
> device = drm->client.base.device;
> drm_put_dev(dev);
>
> --
> 1.8.3.2
>
>
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