sluggish window dragging on r600

[Alex Deucher]

On Mon, Sep 12, 2011 at 3:28 PM, Matthew Monaco <dgbaley27 at 0x01b.net> wrote:
> 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?

You might be running is sw mode if you do not have the radeon
microcode packages installed.  Check your dmesg output and xorg log.

Alex