[Bug 100050] New: [SNB][i915] Screen freezes on switch between Wayland and VTs on Kernel >= 4.10.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100050

            Bug ID: 100050
           Summary: [SNB][i915] Screen freezes on switch between Wayland
                    and VTs on Kernel >= 4.10.1
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: peter.weber at mailbox.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130047
  --> https://bugs.freedesktop.org/attachment.cgi?id=130047&action=edit
pacman_q output, ignore kernel 3.9 here!

Hello!

Since Kernel >= 4.10.1 I cannot switch from Wayland based GNOME-Shell to a
FBDEV based TTY with Ctrl+Alt+Function-Key. This worked till Kernel <= 4.9. The
screen freezes and shows the GNOME-Shell as it was exactly during the
key-press. I cannot see any error or warning in 'dmesg' nor 'journalctl -rb'
but hitting Ctrl+Alt+F2 (in most cases GNOME should be running on TTY2, GDM on
TTY1) will bring back the running GNOME-Shell.

Looking at the output of 'journalctl -rb' I noticed that systemd actually does
launch getty on the selected TTY, so I tried a blind login and it worked. So it
is only a graphical issue.

While using the GNOME-Shell on X11 everything still works as usual, returning
back to Kernel 4.9.11 and everything works as usual also with Wayland. I
noticed some changes to FBDEV and Intel ('fbdev helper ops') in 4.10, but they
sound not massive or Wayland related.

I'm using a ThinkPad X220 with a Sandy-Bridge i7, therefore it is using a Intel
HD3000. Distribution is Archlinux and I'm currently running a self compiled
'4.10.1'.


Historicall background:
For long times switching from Wayland to an TTY wasn't possible if the FBDEV in
the TTY was activley used i.e. by fbi(da) to show a png/jpeg/whatever. But I
didn't cared much, because initally nobody opens fbi(da) and I was able first
to switch to an other TTY without a running fbi(da) and then to the TTY with a
running fbi(da). Same for mplayer and so on.

Side notes:
I initally opend this bug on bugzilla.kernel.org, which is the wrong place?
https://bugzilla.kernel.org/show_bug.cgi?id=194737
Furthermore I noticed this one:
https://bugs.freedesktop.org/show_bug.cgi?id=99841
But it is about X11, not Wayland. X11 works fine with kernel >= 4.10.1 here.

Thank you

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