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authorFrancis Rowe <info@gluglug.org.uk>2015-10-29 00:03:51 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-10-29 00:08:33 (EDT)
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@@ -78,7 +78,7 @@
<h2>Further notes</h2>
<p>
Reading <b>0xe4361254</b> (address) in Lenovo BIOS always yields FFFFFFFF, even when writing to it (and writing to it doesn't affect brightness controls).
- 'mtjm' on IRC found that the buttons (Fn keys) control /sys/class/backlight/acpi_video0 which has no affect on 61254 (BLC_PWM_CTL). He says
+ 'mtjm' on IRC found that the buttons (Fn keys) control /sys/class/backlight/acpi_video0 which has no affect on 61254 (BLC_PWM_CTL). This person says
intel_backlight has different values and uses the register. devmem2 works, needs checking <b>lspci -vv</b> for where the memory is mapped,
which is different than on coreboot; mtjm found that it was 0xec061254 on his system (X60 Tablet), and the register value is different too.
<b>This is relevant, because we still don't know how backlight controls are actually handled. We got it working by accident. We need to know more.</b>.
@@ -93,7 +93,7 @@
<p>
What we want to do is calculate a good value, instead of setting it in devicetree.cb. mtjm says about backlight physics:
it has a light source , uses pulse width modulation (PWM) to turn it on/off, dimming is done by spending less time on.
- <b>Note: this may not be correct; he says his understanding is based on how the Lenote yeeloong works</b>.
+ <b>Note: this may not be correct; this person says that their understanding is based on how the Lenote yeeloong works</b>.
</p>
<p>
mtjm goes on to say, that the register specifies the frequency used for PWM in its depending on the GPU core frequency, so it