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authorFrancis Rowe <info@gluglug.org.uk>2015-04-04 14:05:59 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-04-04 14:05:59 (EDT)
commite4680bbaab69e5bd9f6b022d5ae938259bfc6a24 (patch)
treeeebf0c15d65b3fbd60f1f357a195e55d099b28c2
parentdbdd0bc1e51759f0d9b3d2283ed9f54b011a2c47 (diff)
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docs/install/*_external.html: Update notes: switchable graphics
-rw-r--r--docs/install/r400_external.html21
-rw-r--r--docs/install/t400_external.html21
-rw-r--r--docs/install/t500_external.html21
3 files changed, 42 insertions, 21 deletions
diff --git a/docs/install/r400_external.html b/docs/install/r400_external.html
index 921da5e..aa96d83 100644
--- a/docs/install/r400_external.html
+++ b/docs/install/r400_external.html
@@ -60,16 +60,23 @@
<h1>A note about GPUs</h1>
<p>
- This guide currently assumes that you have an Intel GPU (non-switchable).
- Some T400 have switchable graphics (ATI), which means that you can choose between ATI or Intel
- in the <i>BIOS setup</i>. When switching to Intel, is lenovobios not enabling ATI
- (where ATI is disabled by default and the system uses the Intel chip), or are they
- disabling it (where the system uses the ATI chip by default)?
+ Some models have an Intel GPU, while others have both an ATI and an Intel GPU; this
+ is referred to as &quot;switchable graphics&quot;. In the <i>BIOS setup</i> programme
+ for lenovobios, you can specify that the system will use one or the other (but not both).
</p>
<p>
- Basically, switchable graphics is untested, but it should be easy to get it working
- (if it doesn't already work).
+ Libreboot is known to work on systems with only the Intel GPU, using native graphics initialization.
+ On systems with switchable graphics, it is believed that the ATI chip is used by default; coreboot
+ was tested with the native init and it didn't work, so the theory is that you have to disable
+ the ATI chip and make it use the Intel GPU instead (with native graphics), using the same method
+ as lenovobios. The other alternative is to implement native graphics initialization for the ATI chip
+ used on some models, but this is much harder (disabling the ATI chip in favour of Intel is likely much easier).
+ </p>
+
+ <p>
+ For now (unless you want to help make systems with switchable graphics work, where a display
+ is initialized for the Intel GPU), you should avoid systems with switchable graphics.
</p>
<h1>CPU paste required</h1>
diff --git a/docs/install/t400_external.html b/docs/install/t400_external.html
index 207e51a..e520841 100644
--- a/docs/install/t400_external.html
+++ b/docs/install/t400_external.html
@@ -54,16 +54,23 @@
<h1>A note about GPUs</h1>
<p>
- This guide currently assumes that you have an Intel GPU (non-switchable).
- Some T400 have switchable graphics (ATI), which means that you can choose between ATI or Intel
- in the <i>BIOS setup</i>. When switching to Intel, is lenovobios not enabling ATI
- (where ATI is disabled by default and the system uses the Intel chip), or are they
- disabling it (where the system uses the ATI chip by default)?
+ Some models have an Intel GPU, while others have both an ATI and an Intel GPU; this
+ is referred to as &quot;switchable graphics&quot;. In the <i>BIOS setup</i> programme
+ for lenovobios, you can specify that the system will use one or the other (but not both).
</p>
<p>
- Basically, switchable graphics is untested, but it should be easy to get it working
- (if it doesn't already work).
+ Libreboot is known to work on systems with only the Intel GPU, using native graphics initialization.
+ On systems with switchable graphics, it is believed that the ATI chip is used by default; coreboot
+ was tested with the native init and it didn't work, so the theory is that you have to disable
+ the ATI chip and make it use the Intel GPU instead (with native graphics), using the same method
+ as lenovobios. The other alternative is to implement native graphics initialization for the ATI chip
+ used on some models, but this is much harder (disabling the ATI chip in favour of Intel is likely much easier).
+ </p>
+
+ <p>
+ For now (unless you want to help make systems with switchable graphics work, where a display
+ is initialized for the Intel GPU), you should avoid systems with switchable graphics.
</p>
<h1>CPU paste required</h1>
diff --git a/docs/install/t500_external.html b/docs/install/t500_external.html
index 7307f1a..af898ce 100644
--- a/docs/install/t500_external.html
+++ b/docs/install/t500_external.html
@@ -55,16 +55,23 @@
<h1>A note about GPUs</h1>
<p>
- This guide currently assumes that you have an Intel GPU (non-switchable).
- Some T500 have switchable graphics (ATI), which means that you can choose between ATI or Intel
- in the <i>BIOS setup</i>. When switching to Intel, is lenovobios not enabling ATI
- (where ATI is disabled by default and the system uses the Intel chip), or are they
- disabling it (where the system uses the ATI chip by default)?
+ Some models have an Intel GPU, while others have both an ATI and an Intel GPU; this
+ is referred to as &quot;switchable graphics&quot;. In the <i>BIOS setup</i> programme
+ for lenovobios, you can specify that the system will use one or the other (but not both).
</p>
<p>
- Basically, switchable graphics is untested, but it should be easy to get it working
- (if it doesn't already work).
+ Libreboot is known to work on systems with only the Intel GPU, using native graphics initialization.
+ On systems with switchable graphics, it is believed that the ATI chip is used by default; coreboot
+ was tested with the native init and it didn't work, so the theory is that you have to disable
+ the ATI chip and make it use the Intel GPU instead (with native graphics), using the same method
+ as lenovobios. The other alternative is to implement native graphics initialization for the ATI chip
+ used on some models, but this is much harder (disabling the ATI chip in favour of Intel is likely much easier).
+ </p>
+
+ <p>
+ For now (unless you want to help make systems with switchable graphics work, where a display
+ is initialized for the Intel GPU), you should avoid systems with switchable graphics.
</p>
<h1>CPU paste required</h1>