I have a desktop with an integrated Radeon HD 4200 (RS880), AMD Phenom II X4 965. Driver v6.14.2
I also have a laptop with an i915, Intel Core i3 M370. Driver v2.16.0

Both are on linux 3.0.4. Both are running gnome 3 in fallback mode. Both have identical 1920x1080 monitors connected through HDMI ports (The laptop's LVDS is disabled).

Presumably the desktop is a stronger system with a faster CPU and comparable GPU (don't know much about the differences).

When I drag a window via the title bar on the laptop, everything is smooth; the window stays with the mouse cursor.

When I drag a window via the title bar on the desktop, it's sluggish; the window lags behind the cursor.

Is it likely that something is configured incorrectly, or is there something implemented in the intel driver that is missing from radeon?



Desktop xorg.conf ==========================================================
Section "Device"
        Identifier   "rs880_radeonhd4200"
        Driver       "radeon"

        Option       "Monitor-HDMI-0" "hdmi"
        Option       "Monitor-VGA-0"  "vga"

        #Option       "ColorTiling" "on"
        #Option       "EnablePageFlip" "on"
EndSection

Section "Monitor"
        Identifier   "hdmi"
EndSection

Section "Monitor"
        Identifier   "vga"
        Option       "Enable" "false"
EndSection

Laptop  xorg.conf ==========================================================
Section "Device"
        Identifier "i915"
        Driver     "intel"
        
        Option     "monitor-LVDS1"  "lvds"
        Option     "monitor-HDMI1"  "hdmi"
        Option     "monitor-VGA1"   "vga"
        Option     "monitor-DP1"    "dp"
EndSection

Section "Monitor"
        Identifier "lvds"
EndSection

Section "Monitor"
        Identifier "hdmi"
EndSection

Section "Monitor"
        Identifier "vga"
        Option     "Enable" "false"
EndSection

Section "Monitor"
        Identifier "dp"
        Option     "Ignore" "true"
EndSection
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