[arch-general] clipped video output with multihead

[Sébastien le Preste de Vauban]

When I play a video with mplayer2 (also happens with tvtime)

MPlayer2 2.0-379-ge3f5043 (C) 2000-2011 MPlayer Team
162 audio & 361 video codecs

I get the following display problem on screen 2 (I use a dual head setup]:
http://i42.tinypic.com/2utj482.png

fullscreen,
http://i43.tinypic.com/33xvg29.png

uname -r
3.1.5-1-ARCH

X.Org X Server 1.11.3
Release Date: 2011-12-16

lspci:
00:00.0 Host bridge: Intel Corporation 82865G/PE/P DRAM 
Controller/Host-Hub Interface (rev 02)
00:01.0 PCI bridge: Intel Corporation 82865G/PE/P PCI to AGP Controller 
(rev 02)
00:06.0 System peripheral: Intel Corporation 82865G/PE/P Processor to 
I/O Memory Interface (rev 02)
00:1d.0 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB 
UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB 
UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB 
UHCI Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB 
UHCI Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 
EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC 
Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE 
Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller 
(rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER 
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AR [Radeon 
9600]
01:00.1 Display controller: ATI Technologies Inc RV350 AR [Radeon 9600] 
(Secondary)
02:0a.0 Multimedia video controller: Brooktree Corporation Bt878 Video 
Capture (rev 11)
02:0a.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture 
(rev 11)
02:0d.0 Ethernet controller: Marvell Technology Group Ltd. 88E8001 
Gigabit Ethernet Controller (rev 13)

glxinfo:
name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
GLX version: 1.4
OpenGL vendor string: X.Org R300 Project
OpenGL renderer string: Gallium 0.4 on ATI RV350
OpenGL version string: 2.1 Mesa 7.11.2
OpenGL shading language version string: 1.20

dmesg
http://pastebin.com/fBCmFXDb

Xorg.log.0
http://pastebin.com/GiCbRu4T