I'm getting heavy flickering when dropping below the minimum r=
efresh rate
(default of 40-92, but I also tested 35-92) with Freesync enabled.
It seems to be LFC related as the higher the minimum, the earlier the
flickering kicks in (so it's not a case of the monitor not being able to ha=
ndle
it at the low end).
I can workaround the problem by changing block of code in freesync.c:
if (in_out_vrr->max_refresh_in_uhz <
(2 * in_out_vrr->min_refresh_in_uhz))
in_out_vrr->btr.btr_enabled =3D false;
with:
if (in_out_vrr->max_refresh_in_uhz <
(3 * in_out_vrr->min_refresh_in_uhz))
in_out_vrr->btr.btr_enabled =3D false;
effectively forcing LFC to only kick in at ~30fps or lower.=20
It's possibly a regression as I don't remember the issue occurring with Veg=
a or
Polaris and 5.2 kernel. It's also possible that it's the monitor itself at
fault, and maybe LFC wasn't kicking in properly in older kernels/hardware,
effectively hiding the problem. I will try to get around to testing with Ve=
ga
and an older kernel in the future.
System:
MSI 5700 XT
amd-staging-drm-next
Mesa git