QEMU/KVM mouse not working?

This guy knows the answer:

$ export SDL_VIDEO_X11_DGAMOUSE=0

For me, because I use a physical device for a disk and didn't want to give myself permission on the device:

$ sudo SDL_VIDEO_X11_DGAMOUSE=0 qemu-launcher

My mouse stopped working after I configured Xinerama and display rotation on X (I had alsoi upgraded to Ubuntu 9.04 but I didn't test my VM before fiddling with xorg.conf).

XOrg configuration for Samsung LA32A450C1

This guy nailed it. I had only just found the manual page for my Samsung 32" LCD TV and was still googling for a tool to find the modeline.

I've only added the option to turn off nvidia's logo to his X configuration. Too good:

Section "Monitor"
Identifier "SamsungTV"
ModelName "Samsung LCD TV"
ModeLine "1360x768@60" 85.8 1360 1440 1552 1792 768 771 777 795 +hsync +vsync
Option "dpms"
EndSection

Section "Device"
Identifier "NVIDIAVideocard0"
Driver "nvidia"
Option "ModeValidation" "DFP-0: NoDFPNativeResolutionCheck"
Option "ExactModeTimingsDVI" "TRUE"
#### 100 DPI
Option "UseEDIDDpi" "FALSE"
Option "DPI" "100 x 100"
Option "NoLogo" "True"
EndSection

Section "Screen"
Identifier "Screen0"
Device "NVIDIAVideocard0"
Monitor "SamsungTV"
DefaultDepth 24
SubSection "Display"
Depth 24
##### Native Res Samsung 1360x768@60
Modes "1360x768@60" "1280x720" "1024x768" "800x600" "640x480"
EndSubSection
EndSection