100% CPU usage on the CPU thread doesn't sound normal at all.
1) Make sure you are running the latest development version.
2) Reset your Dolphin configuration by deleting ~/.dolphin-emu (warning: this will remove your Wii NAND too) or ~/.config/dolphin-emu and see if the issue still happens with the default settings.
1) Make sure you are running the latest development version.
2) Reset your Dolphin configuration by deleting ~/.dolphin-emu (warning: this will remove your Wii NAND too) or ~/.config/dolphin-emu and see if the issue still happens with the default settings.