Bug#526269: An afterimage occurs

[Jonny <jonny@csc.jp>]

Package: xserver-xorg-video-siliconmotion
Version: 1:1.7.1-1

A screen becomes full of afterimages. It does not generate in 1:1.7.0-2.

It seems that this commitment is the cause:
http://cgit.freedesktop.org/xorg/driver/xf86-video-siliconmotion/commit/?id=abf1ba79f2bfe61f24cfa43deb0400d7c5f95bd5

When this patch was removed, the afterimage disappeared.

lspci -v:
00:02.0 VGA compatible controller: Silicon Motion, Inc. SM712 LynxEM+ (rev a0) (prog-if 00 [VGA controller])
        Subsystem: IBM Device 01a4
        Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 10
        Memory at 0e000000 (32-bit, non-prefetchable) [size=16M]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [40] Power Management version 1

xorg.conf:
Section "Device"
        Identifier      "Card0"
        Driver          "siliconmotion"
        Option          "UseBIOS"               "false"
        Option          "AccelMethod"           "exa"
EndSection