Comment 3 for bug 1212344

StacktraceTop:
 use_shadow (crtc=0x7fa1ba5e0a60, sna=0x7fa1b862e000) at ../../../src/sna/sna_display.c:1128
 sna_crtc_attach (crtc=0x7fa1ba5e0a60) at ../../../src/sna/sna_display.c:1186
 sna_crtc_set_mode_major (crtc=0x7fa1ba5e0a60, mode=0x7fffa71351c0, rotation=<optimized out>, x=<optimized out>, y=<optimized out>) at ../../../src/sna/sna_display.c:1424
 xf86CrtcSetModeTransform (crtc=crtc@entry=0x7fa1ba5e0a60, mode=mode@entry=0x7fffa71351c0, rotation=rotation@entry=1, transform=transform@entry=0x0, x=x@entry=0, y=y@entry=0) at ../../../../hw/xfree86/modes/xf86Crtc.c:297
 xf86RandR12CrtcSet (pScreen=0x7fa1ba60c550, randr_crtc=0x7fa1ba611ff0, randr_mode=<optimized out>, x=0, y=0, rotation=<optimized out>, num_randr_outputs=1, randr_outputs=0x7fa1baf8c6d0) at ../../../../hw/xfree86/modes/xf86RandR12.c:1216