https://bugs.freedesktop.org/show_bug.cgi?id=73067
--- Comment #9 from Vasco Almeida vasquinhos13@sapo.pt --- Yes, the attached patch fixed the flicker. Screen does not flick whichever value is power_dpm_state or power_dpm_force_performance_level.
Before the patch, the flicker happened when switching from power level 2 sclk: 66500 mclk: 95000 vddc: 1082 to power level 1 sclk: 50000 mclk: 70000 vddc: 1046
In the way level 1 -> level 2 there is not screen flicker.