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authorFrancis Rowe <info@gluglug.org.uk>2015-12-06 11:34:07 (EST)
committer Francis Rowe <info@gluglug.org.uk>2015-12-06 11:34:07 (EST)
commit3a61a752b35aed42fb78231c961bb4d16b7846fb (patch)
tree51f3602ddd67a66c4f5d4a042c4908945729d47b
parent8fa85ccd01c1c9c54db95a1b490efcb3b34d5e3d (diff)
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FAQ: ATI GPUs on GM45 hardware
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@@ -53,6 +53,7 @@
</ul>
</li>
<li><a href="#librem">Will the Purism Librem laptops be supported?</a></li>
+ <li><a href="#t400t500ati">Will libreboot work on a ThinkPad T400 or T500 with an ATI GPU?</a></li>
<li><a href="#thinkpads">Will the latest Thinkpad models be supported?</a></li>
<li><a href="#desktops">Will desktop/server hardware be supported?</a></li>
<li><a href="#randomhardware">Hi, I have &lt;insert random system here&gt;, is it supported?</a></li>
@@ -348,6 +349,25 @@
<a href="#pagetop">Back to top of page</a>
</p>
+ <h2 id="t400t500ati">Will libreboot work on a ThinkPad T400 or T500 with an ATI GPU? <span class="r"><a href="#t400t500ati">#t400t500ati</a></span></h2>
+ <p>
+ Short answer: yes.
+ </p>
+ <p>
+ These laptops use what is called <i>switchable graphics</i>, where it will have an Intel or ATI GPU.
+ Coreboot will allow you to set (using nvramtool) a parameter, specifying whether you would like to use
+ Intel or ATI. The ATI GPU lacks free native graphics initialization in coreboot, unlike the Intel GPU.
+ </p>
+ <p>
+ Libreboot modifies coreboot, in such a way where this nvramtool setting is ignored. Libreboot will just
+ assume that you want to use the Intel GPU. Therefore, the ATI GPU is completely disabled on these laptops.
+ Intel is used instead, with the free native graphics initialization (VBIOS replacement) that exists in
+ coreboot.
+ </p>
+ <p>
+ <a href="#pagetop">Back to top of page</a>
+ </p>
+
<h2 id="thinkpads">Will the latest ThinkPad models be supported? <span class="r"><a href="#thinkpads">#thinkpads</a></span></h2>
<p>
The latest ThinkPad generation supported in libreboot are the ones