[Bug 60523] Radeon DPM not working with 2 monitors attached to Radeon HD5770 (Juniper)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60523

Martin Steghöfer <martin at steghoefer.eu> changed:

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                 CC|                            |martin at steghoefer.eu

--- Comment #72 from Martin Steghöfer <martin at steghoefer.eu> ---
I'm having the same problem (stuck in power level 2 with dual monitor setup;
trying to force it results in "invalid argument" error) on Kernel 4.2.0-16.19
(Ubuntu versioning; not sure, how that translates to the "real" Kernel
versions) - just in case you need someone to try something or provide
information.

(In reply to Alex Belykh from comment #46)
> Funnily enough, if I boot with either of monitors detached, it boots and
> works fine, and if I then reattach the second monitor and connect it with
> xrandr, everything keeps working fine.

I can confirm the effectiveness of this workaround. Booting with only one
monitor attached and adding the other one later results in being able to force
performance levels and also in correct automatic level adjustments (when not
forced).

Maybe this workaround is the key to solving this issue. Now I can run the
system in both the working and the screwed-up state with otherwise the same
hardware configuration and log internal information. There has to be some
loggable difference between the two. I just don't know, what to look for (never
did any kernel development), so I'd need someone to provide the log statements
and interpret their output.

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