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I have an AMD a10-5800k APU that I was using for graphics because it has integrated graphics. Knowing that I can't use AMD Dual Graphics on Linux, I got a dedicated card anyway because I can use Dual Graphics in Windows. Even though Windows is better for gaming now, Ubuntu is not only slow now, it's become terribly unstable. Even the keyboard is acting odd.

Information that may help: the GRUB bootloader is now in a low resolution like 800x600 or 640x480, not sure which, whereas it used to be in 1080p like the desktop. The Ubuntu splash screen is gone so after grub the only visual that comes is the login screen. After logging in, the background becomes completely jumbled before the launcher loads, after which it stabilizes. Very noticeable keyboard input delay now as well.

Is this a bug or can I fix it?

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Have you installed AMD Catalyst drivers? –  Naveen May 30 at 12:58
    
The proprietary catalyst drivers made it worse. The video just freezes right before the login screen and after a generic plain text splash screen. The frozen video consists of an underscore in the top left with the rest of the screen being blank. I hear the login drum sound, so the system is proceeding normally with the exception of video. EDIT: After booting from my Ubuntu USB installer, it's the same story; no splash screen, terrible performance when it does load, and delayed keyboard input. I can only assume this means Linux doesn't properly support my graphics card. What a shame. –  PerseusRising May 30 at 13:27
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Other way around actually. Your graphics card does not support Linux. Your question must be answered by the manufacturer of the device, not Linux. –  Naveen May 30 at 13:36
    
I see now. Thanks for the answer! –  PerseusRising May 30 at 13:43
    
What is your dedicated card? What version of Ubuntu do you have installed? Can you try booting from the 14.04 installer and select "Try Ubuntu" to see if that works? –  bain Jun 3 at 12:59

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