(a) A bylaw adopted by the shareholders may fix a greater quorum or voting requirement for shareholders (or voting groups of shareholders) than is required by this chapter. A bylaw in effect on July 1, 1989, fixing a greater quorum or voting requirement for shareholders (or voting groups of shareholders) than is required by this chapter shall remain valid until amended or repealed as provided in subsection (b) of this Code section.

(b) Except as provided in Code Section 14-2-1020, 14-2-1113, or 14-2-1133, a bylaw that fixes a greater quorum or voting requirement for shareholders under subsection (a) of this Code section may not be adopted, amended, or repealed by the board of directors.