[Bug 91974] [bisected] unrecoverable black screen after killing X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91974

Khumba <freedesktop-bugs-79382 at khumba.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED

--- Comment #13 from Khumba <freedesktop-bugs-79382 at khumba.net> ---
Okay, I did a fresh round of testing, here are the results.  While it still is
an issue with latest versions on NixOS, I haven't been able to repro on Gentoo.
 The NixOS build of xf86-video-intel uses the default configure flags, whereas
Gentoo specifies them via USE flags, so I mention what's being used below. 
I'll also upload the build logs of (4) and (5).

(1) gentoo arch=amd64 sm=openrc kernel=4.4.6-gentoo xorg-server=1.17.4
xf86-video-intel=2.99.917-r2(date=2014-12-21)
  (USE="dri sna udev -debug -uxa -xvmc"; the defaults)
  kill X: works

(2) nixos head=6e0dddf(release-16.03) sm=systemd kernel=4.4.10
xorg-server=1.17.4 xf86-video-intel=2015-11-14(rev=0340718)
  kill X: broken

(3) nixos *head=06aae7c(master)+changes* sm=systemd *kernel=4.6*
xorg-server=1.17.4 xf86-video-intel=2015-11-14(rev=0340718)
  kill X: broken

(4) nixos head=06aae7c(master)+changes sm=systemd kernel=4.6 xorg-server=1.17.4
*xf86-video-intel=2016-05-19(rev=25d2c2d)*
  kill X: broken

...okay, back to Gentoo to try to repro there...

(5) gentoo arch=amd64 sm=openrc kernel=4.4.6-gentoo xorg-server=1.17.4
*xf86-video-intel=2016-05-07(rev=88733a7)*
  (USE="dri sna udev -debug -dri3 -uxa -xvmc")
  (Note: Gentoo enables dri3 by default, but the ebuild says that dri3
   depends on xorg-server-1.18, so to avoid upgrading I disabled it.)
  kill X: works

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