Author: xry111
Date: Sun Feb 21 07:34:50 2021
New Revision: 24254
Log:
xorg testing: add sysrq as a precaution if Xorg hangs
Modified:
trunk/BOOK/x/installing/xorg-config.xml
Modified: trunk/BOOK/x/installing/xorg-config.xml
==============================================================================
--- trunk/BOOK/x/installing/xorg-config.xml Sun Feb 21 06:55:47 2021
(r24253)
+++ trunk/BOOK/x/installing/xorg-config.xml Sun Feb 21 07:34:50 2021
(r24254)
@@ -39,6 +39,35 @@
</para>
</note>
+ <warning>
+ <para>
+ If Xorg hangs for some reason (for example, lacking a proper
+ input driver), the system may stop responsing to any user input.
+ As a precaution, you can enable a magic <keycap>SysRq</keycap> key
+ before testing Xorg. As the
+ <systemitem class="username">root</systemitem> user, issue:
+ </para>
+
+<screen><userinput>echo 4 > /proc/sys/kernel/sysrq</userinput></screen>
+
+ <para>
+ Then if Xorg hangs, it's possible to use
+ <keycombo>
+ <keycap>Alt</keycap>
+ <keycap>SysRq</keycap>
+ <keycap>R</keycap>
+ </keycombo>
+ to reset the keyboard mode. Now it should be able to use
+ <keycombo>
+ <keycap>Ctrl</keycap>
+ <keycap>Alt</keycap>
+ <keycap>Fx</keycap>
+ </keycombo>
+ (replace x with a VT number) to switch to another VT.
+ If it works, login and kill Xorg using command line in the new
VT.
+ </para>
+ </warning>
+
<para>
To test the <application>Xorg</application> installation, issue
<command>startx</command>. This command brings up a rudimentary window
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