Comment 78 for bug 656241

confirmed on arch linux using xf86-video-ati 6.14.0-1 (xorg-video-drivers)
mixxx 1.9.0-1

lspci | grep -i vga
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY

lsmod | grep -E '(radeon|video|ati|vga)'
radeon 845112 3
ttm 44512 1 radeon
drm_kms_helper 23703 1 radeon
drm 141488 5 radeon,ttm,drm_kms_helper
i2c_algo_bit 4191 1 radeon
video 10367 0
i2c_core 16029 6 radeon,drm_kms_helper,drm,i2c_algo_bit,i2c_ali1535,i2c_ali15x3
output 1456 1 video