[Bug 89055] [SKL APL] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89055

--- Comment #60 from Matt Roper <matthew.d.roper at intel.com> ---
(In reply to Oli from comment #59)
> Not sure if this is related, but I saw the same OOPSs in my dmesg log,
> though I assumed I apply this patch in order to get 4k output at 60 Hz.
> 
> Short background, I have a Dell XPS 13 9350 with an Intel Iris 540. See
> `lspci -vvnn` here: http://ix.io/DEG
> 
> I applied the patch and started the new kernel with i915.enable_rc6=0, in
> the hope that I could finally `xrandr --output DP1 --mode 3840x2160 --rate
> 60`. Though, when I issue this, my screen goes blank with the following
> error:
> 
[snip]
> 
> The whole dmesg is here: http://ix.io/DEH
> 
> Could someone give me a hint how to achieve 4k output with an refresh rate
> of 60 Hz?
> 
> Thanks in advance.

The message you're getting now doesn't appear to be related to watermarks, so I
don't think your problems are caused or fixed by my patch series (although the
message you see in your log now may have been hidden amid all the noise that my
patches have now removed).  Can you file a new bug for that so that your issue
doesn't get lost in the mix here?

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