[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #7 from Bernd Steinhauser  ---
I'm not a 100% sure, but quite certain, that I couldn't reproduce this bug with
kernel 4.2.5, so I think it's at least related to the linked email.

I also was able to reproduce this in such a way, that all screens go black.
>From the description of the option, I think that this was because I didn't have
TearFree set.

So I'm not sure anymore if it is really a separate bug or a dupe of 90987.
Could be that the options just change the buffer behavior in such a way that it
can either be fixed by switching to VT2 or not.
If it's the same, I would have been able to reproduce with 4.2.5, with the
effect described in bug 90987.

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #6 from Bernd Steinhauser  ---
(In reply to Michel Dänzer from comment #5)
> Does this only happen with Option "TearFree"? Only with a 4.4 kernel?
No, it doesn't seem to be related to the Pageflip option either.

> 
> It sounds like it could be the problem discussed in
> http://lists.freedesktop.org/archives/dri-devel/2016-January/098823.html and
> followups.
Could be, yes. However, I think that I had problems with linux 4.2 as well. 4.3
for sure. I bought this screen (the Eizo) in September and since 4.2 came out
in August, this seems likely.
I will try it out, though during my next test run tomorrow.

> 
> P.S. How does this relate to bug 90987?
Not sure. The difference is, that in this one, only that single screen
misbehaves, in bug 90987, all of them do.
I can reproduce both individually.
Also, while this one is fixable by switching to VT2 and back, bug 90987 seems
only fixable by restarting X (or at least I didn't find another way yet).

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #5 from Michel Dänzer  ---
Does this only happen with Option "TearFree"? Only with a 4.4 kernel?

It sounds like it could be the problem discussed in
http://lists.freedesktop.org/archives/dri-devel/2016-January/098823.html and
followups.

P.S. How does this relate to bug 90987?

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #4 from Bernd Steinhauser  ---
(In reply to Bernd Steinhauser from comment #0)
> The issue goes away when I set
> Option  "DRI" "2"

I think I have to revert myself here. I've seen this with DRI2 as well. I have
yet to find out what changed.

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #2 from Bernd Steinhauser  ---
Created attachment 121189
  --> https://bugs.freedesktop.org/attachment.cgi?id=121189=edit
dmesg output

Output by dmesg up to the point where the screen was switched off and on again,
including a VT change (working around the problem) afterwards.

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #3 from Bernd Steinhauser  ---
Created attachment 121190
  --> https://bugs.freedesktop.org/attachment.cgi?id=121190=edit
Xorg log

Corresponding X log.

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[Bug 93746] Black screen when reconnecting display with DRI3

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=93746

--- Comment #1 from Alex Deucher  ---
Please attach your xorg log and dmesg output.

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