QXL driver does not support 8-bit depth

Issue

We would like to support a legacy application on our RHEL 6 workstation image in development. This application expects the client displays to be at 8 bit depth. We would like to virtualize this setup so we can consolidate.

Here's an excerpt from the Xorg.0.log to illustrate the problem:

[582370.194] (II) Loading /usr/lib64/xorg/modules/drivers/qxl_drv.so
[582370.194] (II) Loading /usr/lib64/xorg/modules/drivers/qxl_drv.so
[582370.194] (II) Loading /usr/lib64/xorg/modules/drivers/qxl_drv.so
[582370.194] (EE) qxl(0): Depth 8 is not supported
[582370.194] (EE) qxl(1): Depth 8 is not supported
[582370.194] (**) qxl(2): Depth 24, (--) framebuffer bpp 32
[582370.194] (==) qxl(2): RGB weight 888
[582370.194] (==) qxl(2): Default visual is TrueColor
[582370.194] (==) qxl(2): Using gamma correction (1.0, 1.0, 1.0)
[582370.194] (**) qxl(2): Option "EnableImageCache" "False"
[582370.194] (**) qxl(2): Option "EnableFallbackCache" "False"
[582370.194] (**) qxl(2): Option "EnableSurfaces" "False"
[582370.194] (II) qxl(2): Offscreen Surfaces: Disabled
[582370.194] (II) qxl(2): Image Cache: Disabled