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I'm seeing a problem in Ubuntu 12.04 and later. When I boot into a video game like Half Life 2, I get massive lag (FPS drops) and my CPU runs at 100%. My system even lags for games like SuperTuxCart but it has great performance on the desktop, playing videos in 1080p etc.

When I go into "Big Picture" mode (a feature that allows me to play my games on my TV) on Steam, it loads in the lowest possible resolution and when I try to change it, Steam warns me that my display device only has 268 MB of dedicated GPU Memory. My system is a HP Pavilion 2248-G6 with an AMD A4-4300M graphics card, running catalyst 13.11 beta drivers.

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Please don't bold many words. You don't need to point stuff out most of the time. Otherwise, good question. +1. – Kaz Wolfe Jan 6 '14 at 2:00
I had a similar issue once (in Windows, actually) and it turned out that my GPU was too powerful for my CPU. Maybe that's your problem. Lowering the game graphic details and anti-aliasing should help, I think. – GabrielF Jan 6 '14 at 3:50

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