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xorg-config: Some reword about the TearFree control

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1. Move the configuration file into /etc, to be consistent with other
   configuration files created in BLFS.
2. We no longer need a separate "configure the graphic card" example
   because the TearFree configuration file is already a good example.
3. Tearing issue is really not new after xf86-video-* removal.  In some
   xf86-video-* drivers a TearFree option is available but rarely
   enabled by default (only the amdgpu driver when the output is rotated
   or transformed).  So this is actually the first time we document it
   in BLFS.
4. It's really not difficult to observer the tearing by dragging a
   window in twm, despite twm only renders the window border during
   dragging.
This commit is contained in:
Xi Ruoyao 2023-07-26 15:56:42 +08:00
parent 2ac99448b1
commit 4ada352178
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1 changed files with 18 additions and 24 deletions
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42
x/installing/xorg-config.xml
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@ -480,32 +480,18 @@ EndSection</literal>
EOF</userinput></screen>
<para>
With modern Xorg, little or no additional graphic card configuration
is necessary. If you should need extra options passed to your video
driver, for instance, you could use something like the following
(again, executed as the &root; user):
When you drag a window in twm (or any non-compositing window
manager) horizontally, you may observe that the vertical borders
of the window are broken into multiple segments. This is an example
of the visual artifacts called <emphasis>screen tearing</emphasis>.
To resolve the screen tearing problems, create a configuration file
that enables the TearFree option. Note that you must have the
Tearfree patch applied from <xref role="nodep"
linkend="xorg-server"/> for this to function properly, and it may
increase memory allocation and reduce performance.
</para>
<screen role="root"><userinput>cat &gt; /etc/X11/xorg.conf.d/videocard-0.conf &lt;&lt; "EOF"
<literal>Section "Device"
Identifier "Videocard0"
Driver "modesetting"
VendorName "Videocard vendor"
BoardName "ATI Radeon 7500"
Option "AccelMethod" "none"
EndSection</literal>
EOF</userinput></screen>
<para>
Some graphics cards may have problems with screen tearing now that Xorg
has moved to using the modesetting driver in BLFS. To resolve the screen
tearing problems, create a configuration file that enables the TearFree
option. Note that you must have the Tearfree patch applied from
<xref role="nodep" linkend="xorg-server"/> for this to function
properly.
</para>
<screen role="root"><userinput>cat &gt; /usr/share/X11/xorg.conf.d/20-tearfree.conf &lt;&lt; "EOF"
<screen role="root"><userinput>cat &gt; /etc/X11/xorg.conf.d/20-tearfree.conf &lt;&lt; "EOF"
<literal>Section "Device"
Identifier "Graphics Adapter"
Driver "modesetting"
@ -513,6 +499,14 @@ EOF</userinput></screen>
EndSection</literal>
EOF</userinput></screen>
<para>
With modern Xorg, little or no additional graphic card configuration
is necessary. If you should need extra options passed to your video
driver, add them into the <literal>Device</literal> section as well.
The options supported by the modesetting driver are documented in
the man page <filename>modesetting(4)</filename>.
</para>
</sect3>
</sect2>
</sect1>