As far as i'm aware the m5312 has the same IGP 320 as the m5310. i believe the onlydifference between the 2 models is the hdd capacity, but i could be wrong. Anyway. here's what i did to get it working fine.
edit /etc/X11/XF86Config and make sure the following sections are as follows
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Generic Laptop Display Panel 1280x800"
HorizSync 31.5 - 67.0
VertRefresh 50.0 - 71.0
Option "dpms"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon Mobility U1"
VideoRam 32768
ChipId 0x4242
Option "dpms"
Option "UseFBDev"
Option "noaccel"
Option "AGPMode" "4"
BusID "PCI:1:5:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
i got that info from linux-laptop.net and it worked a treat for me.
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