Date: Sat, 13 Feb 1999 23:08:37 +0300 (MSK) From: kostik@org.chem.msu.su To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/10066: problem with an x-server and syscons driver seems to be solved Message-ID: <199902132008.XAA05957@org.chem.msu.su>
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>Number: 10066
>Category: kern
>Synopsis: problem with a X-Window and syscons driver solved
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Feb 13 12:10:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Konstantin Y. Pasichnichenko
>Release: FreeBSD 3.0-RELEASE i386
>Organization:
Russia, Moscow, Moscow State University, Chemistry department.
>Environment:
System: FreeBSD-3.0-Release i386 + XFree86-3.3.2
Architecture: i386 (Pentium-133 system)
>Description:
it is well known problem: switching between consoles using syscons driver
while x-server is starting will hang the syscons driver with a ~50% possibility
(i.e. turn it to unknown abnormal state).
>How-To-Repeat:
start an x-server (xfree86, independently to x-server type)
(or run x-window system), and while x-server _is_ starting
and _is_ switching to next available free console,
quickly switch back to text console by ctrl+alt+f? combination.
it will some times turn syscons console driver
to unknown half-hung state, when it isn't possible to switch back
from graphics-x-server-console to text-cosole.
or, the most better way, run x-window (xfree86-3.3.2) in 8-bpp mode
and then run xf86quake linux version (with a linux emulation enabled).
xf86quake will lock console driver with all x-server. then while running
xf86quake try to switch to text console (regardless which one text console
will need). syscons driver will `beep' but willn't switch back to
text console. after this your may quit from xf86quake - syscons driver
have hung and willn't switch to any text console anymore, he will `beep'
instead, but you still able to run x-server remotely, while loggin in
from network or serial console and to continue your work in x-window;
text-mode consoles will broke.
>Fix:
the following patch applied to syscons driver source
/usr/src/sys/i386/isa/syscons.c
will fix the broblem discussed above in a case of FreeBSD-3.0-RELEASE:
-- file syscons.c.diff --
*** syscons.c.old Fri Oct 2 01:04:52 1998
--- syscons.c Thu Jan 7 23:40:04 1999
***************
*** 2312,2317 ****
--- 2312,2328 ----
else
switch_in_progress = FALSE;
}
+ /*
+ * XXX: kostik's hack:
+ * i found it eliminate console Xserver related problem;
+ * now console will not hang while switching
+ * to text console simultaneously with a Xserver starting;
+ * if it will work for somebody else
+ * pls, drop me e-mail to kostik@org.chem.msu.su
+ */
+ switch_in_progress = FALSE;
+ delayed_next_scr = FALSE;
+
return 0;
}
>Release-Note:
>Audit-Trail:
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