[Bug 58121] Radeon SUMO: LVDS panel blanks when enabling external monitor

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=58121

Niels Ole Salscheider <niels_ole at salscheider-online.de> changed:

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--- Comment #6 from Niels Ole Salscheider <niels_ole at salscheider-online.de> ---
Created attachment 127381
  --> https://bugzilla.kernel.org/attachment.cgi?id=127381&action=edit
Possible fix

I tried a current git checkout and noticed that now only DisplayPort monitors
cause the problem - VGA works fine.
After debugging the issue a bit further I noticed that the problem seems to be
caused by a shared PLL between the bridge chip and the DP monitor.

The attached patch fixes the issue for me but I am not sure if we must not
share PLLs at all or just not with the bridge chip.

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