https://bugs.freedesktop.org/show_bug.cgi?id=110865
--- Comment #7 from Alex Deucher <alexdeuc...@gmail.com> ---
(In reply to Martin from comment #6)
> Sadly it did not help.
> the MCLK is still fixed at 2000MHz.
>
> How can I verify that I did everything correctly?
You can add a printk to the patch to verify that it's being applied. Maybe
print the value of hwmgr->display_config->multi_monitor_in_sync to see if the
monitors are synced or not.
> I just rebuilt Kernel 5.2.6 from Fedoras srpm and added the patch in the
> spec file.
>
> Or could it be that I have two different 1920x1200 screens? one from HP and
> one from Dell?
That is likely the issue. If the timings for the displays are slightly
different, they won't be synced. It could also be that the DC code doesn't set
the multi_monitor_in_sync flag properly.
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