xorg-server running on 10-current under VMware?

I've tried using drivers xf86-video-vmware (vmware) and xf86-video-vesa (vesa) for 10-current under VMware Fusion. Regardless, the X server fails with the error:

> […]
> (==) VESA(0): Backing store disabled
> 
> Fatal server error:
> AddScreen/ScreenInit failed for driver 0
> 
> 
> Please consult the The X.Org Foundation support 
> 	 at http://wiki.x.org
>  for help. 
> Please also check the log file at "/var/log/Xorg.0.log" for additional information.
> 
> (==) VESA(0): Write-combining range (0x0,0x1000) was already clear
> (==) VESA(0): Write-combining range (0x0,0x1000) was already clear

or

> […]
> (==) vmware(0): Backing store disabled
> (==) vmware(0): Silken mouse enabled
> 
> Fatal server error:
> AddScreen/ScreenInit failed for driver 0
> 
> 
> Please consult the The X.Org Foundation support 
> 	 at http://wiki.x.org
>  for help. 
> Please also check the log file at "/var/log/Xorg.0.log" for additional information.
> 
> Segmentation fault at address 0x290
> 
> FatalError re-entered, aborting
> Caught signal 11 (Segmentation fault). Server aborting

Any hints?

Thanks.

Guy