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	<id>http://etcwiki.org/index.php?action=history&amp;feed=atom&amp;title=Acpi_vpc2004</id>
	<title>Acpi vpc2004 - Revision history</title>
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	<updated>2026-04-20T23:45:23Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3597&amp;oldid=prev</id>
		<title>Ddxfish at 18:06, 24 July 2015</title>
		<link rel="alternate" type="text/html" href="http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3597&amp;oldid=prev"/>
		<updated>2015-07-24T18:06:48Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 18:06, 24 July 2015&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l19&quot;&gt;Line 19:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 19:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;*[http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/ACPI-VPC2004/td-p/32815/page/5 Lenovo Forums on this issue]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;*[http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/ACPI-VPC2004/td-p/32815/page/5 Lenovo Forums on this issue]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
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&lt;/table&gt;</summary>
		<author><name>Ddxfish</name></author>
	</entry>
	<entry>
		<id>http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3587&amp;oldid=prev</id>
		<title>Ddxfish at 17:58, 24 July 2015</title>
		<link rel="alternate" type="text/html" href="http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3587&amp;oldid=prev"/>
		<updated>2015-07-24T17:58:47Z</updated>

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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 17:58, 24 July 2015&lt;/td&gt;
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&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==External Links==&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==External Links==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;*[http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/ACPI-VPC2004/td-p/32815/page/5 Lenovo Forums on this issue]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;*[http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/ACPI-VPC2004/td-p/32815/page/5 Lenovo Forums on this issue]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
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&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Category:Microsoft Windows]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Ddxfish</name></author>
	</entry>
	<entry>
		<id>http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3150&amp;oldid=prev</id>
		<title>Ddxfish at 03:03, 13 August 2013</title>
		<link rel="alternate" type="text/html" href="http://etcwiki.org/index.php?title=Acpi_vpc2004&amp;diff=3150&amp;oldid=prev"/>
		<updated>2013-08-13T03:03:07Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;ACPI/VPC2004 is the hardware ID of an unknown device on my lenovo laptop that I have recently fixed. Once I formatted and installed windows 7 it was a device without driver in the &amp;quot;unknown devices&amp;quot; section of device manager. The device when installed correctly is the &amp;quot;Lenovo ACPI-Compliant Virtual Power Controller&amp;quot;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
ACPI VPC2004 driver is found during the installation of certain drivers from lenovo.&lt;br /&gt;
&lt;br /&gt;
==Symptoms==&lt;br /&gt;
Unknown Device with device ID &amp;quot;ACPI/VPC2004&amp;quot;&lt;br /&gt;
This solution worked with Windows Vista and 7&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Fixing the ACPI/vpc2004 driver==&lt;br /&gt;
*Update and install &amp;quot;Lenovo Energy Management&amp;quot; software (comes with a driver, HAS to be from lenovo for your machine)&lt;br /&gt;
*Restart and check device manager to see if your device is still unknown&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==External Links==&lt;br /&gt;
*[http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/ACPI-VPC2004/td-p/32815/page/5 Lenovo Forums on this issue]&lt;/div&gt;</summary>
		<author><name>Ddxfish</name></author>
	</entry>
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