One speculative attempt to try is to try setup for Tear Free Rendering … I note Arch Linux have a Catalyst wiki with advice: https://wiki.archlinux.org/index.php/AMD_Catalyst#Tear_Free_Rendering where I quote from that wiki :
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Presented in Catalyst 11.1, the Tear Free Desktop feature reduces tearing in 2D, 3D and video applications. This likely adds triple-buffering and v-sync. Do note that it requires additional GPU processing.
To enable ‘Tear Free Desktop’ run amdcccle and go to: Display Options → Tear Free.
Or as root run:
**# aticonfig --set-pcs-u32=DDX,EnableTearFreeDesktop,1 **
To disable, again use amdcccle or run as root:
**# aticonfig --del-pcs-key=DDX,EnableTearFreeDesktop
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If it does not work, then I recommend you use the ‘disable’ step noted above