[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

--- Comment #53 from Karthik B S <karthik.b.s at intel.com> ---
(In reply to Johannes Berg from comment #49)
> I'm sorry, I've been completely swamped.
> 
> I'll attach the config file, as for other details, I think you asked for
> details on the configuration.
> 
> So, I have:
>  1) A Dell U2312HM running at 1920x1080 @ 60Hz
>  2) A Dell U2311H  running at 1920x1080 @ 60Hz
>  3) internal display running at 1920x1080
> 
> Both are connected using DP, but one is connected directly to the laptop
> (USB-C connector) and the other is connected via a dock as mentioned before.
> I said before it was connected on HDMI, but it is connected on DP now.
> Didn't change anything.
> 
> I've been running with the workaround:
> 
> for plane in pri cur spr; do echo 20 500 500 500 500 500 500 500 >
> i915_${plane}_wm_latency ; done
> 
> which makes it not be an issue for me.

Tried to repro the bug with 2 external DP panels at 2k at 60 and one eDP panel at
2k at 60, using the config file provided on DRM-TIP(5.0.0-rc5+). Still not seeing
any under runs.

I tried video playback on 2 displays for 4-5 hours and also the suspend resume
scenario without any success.

Any particular workload or sequence you can suggest, which might cause this
issue in particular?

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