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Bug#917969: marked as done (lightdm: crashes X on dm-tool switch-to-greeter with multiple displays)

Your message dated Sat, 12 Jan 2019 11:54:33 -0600
with message-id <87o98llq1y.fsf@trouble.defaultvalue.org>
and subject line Re: lightdm: crashes X on dm-tool switch-to-greeter with multiple displays
has caused the Debian Bug report #917969,
regarding lightdm: crashes X on dm-tool switch-to-greeter with multiple displays
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
917969: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=917969
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: lightdm
Version: 1.26.0-3

If I have more than one display active[1], running switch-to-greeter
causes the current X session on vt7 to crash and lightdm never comes
back up on that (original) terminal, at least not until I restart it.
The new lightdm login does appear on vt8.

While I'm not entirely sure this is an issue with lightdm, I've started
trying to narrow it down, and if I just launch X sessions for two
different users manually on say vt3 and vt4 via startx, terminal
switching between them just fine.

This problem is easy to reproduce, so I'm happy to help with the
diagnosis if I can.

I've observed this across any number of kernel and other package
versions on another latptop, and on this laptop I currently have:

  linux-image: 4.19.12-1
  lspci: 00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)

[1] So far I've observed the crashes with intel graphics on two
    different laptops, and I just did a bit more careful testing that
    indicates switching works fine when just a single external
    thunderbolt/usb3->display-port connection is active, but crashes if
    either an additional hdmi external connection is active, or if the
    laptop's internal display is active.  I *think* it also works fine
    if only the internal display is active, but I'll have to
    double-check that later.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4

--- End Message ---
--- Begin Message --- 
I've now seen what may be the same crash without lightdm (when running
sessions directly via startx), so I'm closing this bug, and plan to
pursue the problem at the lower levels.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4

--- End Message ---
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