[Bug 54381] [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=54381


Alex Deucher <alexdeucher at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |alexdeucher at gmail.com




--- Comment #1 from Alex Deucher <alexdeucher at gmail.com>  2013-02-24 16:27:18 ---
This is a hardware limitation.  The hardware only has 2 PLLs for
non-DisplayPort monitors.  As such, the driver only supports 2 independent
pixel clocks on non-DisplayPort monitors.  If you have more than 2 non-DP
monitors, it will only work if several of them share the same pixel clock
(i.e., the monitors sharing a PLL have to display the same mode with the same
pixel clock).  Older kernels did not properly warn about exceeding these
limitations.

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