You menu screenshots look like typical r_overbrightbits issue. Gamma correction doesn't work, but overbrightbits causes intensity reduction. Try r_gammamethod 1, r_gammamethod 2 and r_gammamethod 0 (vid_restart after change).
By the looks of your video init log you'r hardware doesn't support neither r_gammamethod 1 nor 2. This means you may need to use 0 and disable r_overbrightbits.