Emulator

Game Name?
Super Mario Sunshine, Super Smash Bros Brawl, etc.

Game ID?
GMSE01, RSBE01

What's the problem? Describe what went wrong in few words.
When using software renderer with XFB emulation enabled, white areas, possibly bright areas, possibly areas with at least one full-scale channel, have glitchy color artifacts.

What did you expect to happen instead?
No glitchy artifacts with XFB enabled

What steps will reproduce the problem?

1. Start any game
2. Load any scene with bright areas
3. In Brawl, the glitches can be seen as soon as the game boots in the Wiimote safety screen

Dolphin 3.5 and 3.5-367 are old versions of Dolphin that have
known issues and bugs, so don't report issues about them and test the
latest Dolphin version first.
Which versions of Dolphin did you test on?
4.0-1983, 4.0-1759 (8fc83d8ffca75f86c144a7798ebf0661a1eb68ef) (std min max)

Does using an older version of Dolphin solve your issue? If yes, which
versions of Dolphin used to work?
4.0-1757 is not broken. The bug began with 8fc83d8ffca75f86c144a7798ebf0661a1eb68ef Remove the min/max functions in CommonFuncs. (PR #334 from lioncash)

What are your PC specifications? (including, but not limited to: Operating
System, CPU and GPU)
Windows 7 x64, i5 3570K @3.8 GHz, Nvidia Asus GTX 660

Are you using the 32 or the 64 bit version of Dolphin?
x64

Is there any other relevant information? (e.g. logs, screenshots,
configuration files)
Mario Sunshine (ignore the unrelated water glitch): https://forums.dolphin-emu.org/attachment.php?aid=11625 or https://forums.dolphin-emu.org/attachment.php?aid=11626
SSBB Wiimote https://forums.dolphin-emu.org/attachment.php?aid=11627