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Diffstat (limited to 'docs/future/old.html')
| -rw-r--r-- | docs/future/old.html | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/future/old.html b/docs/future/old.html index b99d8849..16f11210 100644 --- a/docs/future/old.html +++ b/docs/future/old.html @@ -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 |