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Based on radeon commit: 95f5d09e3667ded027ae648c97eb4737d8bf67c5 The DRM_IOCTL_WAIT_VBLANK ioctl may return an error during DPMS off, which would trigger an error message in drmmode_crtc_get_ust_msc. Signed-off-by: Tom St Denis <tom.stdenis@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
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