[Bug 111976] [i915] xf86-video-intel breaks secondary display in Xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111976

roccobaroccoSC <v_bachvarov at mail.bg> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #9 from roccobaroccoSC <v_bachvarov at mail.bg> ---
I found something interesting!
The last known good arch package 870 had a patch file that was deleted in the
next version!
The patch file explains exactly the same symptoms as mine.
https://git.archlinux.org/svntogit/packages.git/plain/trunk/0001-SNA-fix-PRIME-output-support-since-xserver-1.20.patch?h=packages/xf86-video-intel&id=ac52f309e918498f64b4c33e6967846cd0a551f6

I have no idea why the patch file was removed but this explains why my own
built sources did not work - I did not have the Arch patch.

Here is what the patch describes:
"
Since xorg-server 1.20, an external monitor would remain blank when used
in a PRIME output slave setup. Only a cursor was visible. The cause is
"Make PixmapDirtyUpdateRec::src a DrawablePtr" in xserver, the "src"
pointer might point to the root window (created by the server) instead
of a pixmap (as created by xf86-video-intel). Use get_drawable_pixmap to
handle both cases.
"

For more details see the URL above.

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