[Bug 88124] i915: regression: after DP connected monitor is turned off, when turned on, it does not work anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88124

--- Comment #13 from Jiri Pirko <jiri at resnulli.us> ---
(In reply to Manasi from comment #12)
> Hi Jiri,
> 
> Do you have a single monitor connected? If so could you test this with a

Yes, a single monitor. As I described in the original bug description of this
BZ.

> direct DP cable going between laptop and monitor without MST hub. Please
> make sure you also turn off DP MST on the monitor. Let's see what happens in
> the SST configuration first and take it from there.

I don't know what MST hub is. But the issue happens if I connect laptop
directly to display. The issue is present with both HP ZR2440w and HP Z27i
displays.

> Please do this test and let me know what you see and attach the dmesg logs
> if you still see the issue.

There's a debug dmesg output already attached to this BZ. Isn't that enough?

This is trivial to reproduce. Am I the only one experiencing this issue? This
is clearly a regression between 3.16 and 3.17. Having this issue on multiple
laptops, multiple displays, multiple kernels.

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