This bug was fixed in the package bash - 5.0-3ubuntu1
---------------
bash (5.0-3ubuntu1) disco; urgency=medium
* Merge with Debian; remaining changes:
- skel.bashrc:
- Run lesspipe.
- Enable ls aliases.
- Set options in ll alias to -alF.
- Define an alert alias.
- Enabled colored grep aliases.
- etc.bash.bashrc:
- Add sudo hint.
bash (5.0-3) unstable; urgency=medium
* Apply upstream patch 003.
* Fix clear_console locking up video when X is running and logging out
from a plain text console. Closes: #810660. LP: #1822184.
-- Matthias Klose <d...@ubuntu.com> Thu, 04 Apr 2019 05:11:47 +0200
** Changed in: bash (Ubuntu)
Status: Opinion => Fix Released
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https://bugs.launchpad.net/bugs/1822184
Title:
clear_console locks up video when X is running and you log out from a
plain text console
Status in X.Org X server:
New
Status in bash package in Ubuntu:
Fix Released
Status in xorg-server package in Ubuntu:
Confirmed
Status in xorg package in Debian:
New
Status in xorg-server package in Debian:
Confirmed
Bug description:
References:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810660
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=866898
If X is running and you switch to a plain text console (ie ctrl-alt-f3), log
in as a regular user, and then log out, the display switches back to the
graphical login screen and locks up. The system is still functioning (can ssh
in, etc) but the video output is frozen.
The underlying cause is:
https://gitlab.freedesktop.org/xorg/xserver/issues/492
However, the problem can at least be worked around by making
clear_console switch to tty 6 and back instead of switching to 1 and
back. This patch corrects the problem:
--- bash-4.4.18.orig/debian/clear_console.c 2019-03-28 12:09:02.415907787
-0400
+++ bash-4.4.18/debian/clear_console.c 2019-03-28 12:08:11.984366858 -0400
@@ -205,7 +205,7 @@
#if defined(__linux__)
num = vtstat.v_active;
#endif
- tmp_num = (num == 1 ? 2 : 1);
+ tmp_num = (num == 6 ? 5 : 6);
/* switch vt to clear the scrollback buffer */
if (ioctl(fd, VT_ACTIVATE, tmp_num))
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