Stuttering / Frame drops with RS880/785G and AMD Bulldozer CPU

Alex Deucher alexdeucher at
Thu Feb 9 05:13:09 PST 2012

On Wed, Feb 8, 2012 at 7:03 PM, Shahar Or <mightyiampresence at> wrote:
> Dear Ones,
> Since replacing an AMD Sempron 140 with an AMD FX-4100 CPU in my
> system I'm experiencing frame drops in practically anything. They seem
> to be CPU activity related and they are very frequent.
> I've reported this is bug #927918 in Ubuntu:
> Please let me know if you think that this could be radeon driver
> related or something else because I really don't know where to
> start... I even looked at the AMD cache penalties bug:
> But it shouldn't make such a big noticeable problem, right?
> The BIOS is latest version. I've also tested FGLRX and that gives me
> low framerate in Ubuntu compiz so I'm not sure if there were frame
> drops.

Perhaps you didn't fully uninstall fglrx and reinstall the open source
driver.  Check the output of glxinfo and make sure you are not using
the software 3D driver.


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