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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73156#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73156">bug 73156</a>
from <span class="vcard"><a class="email" href="mailto:daiver@daiver.ru" title="Daiver <daiver@daiver.ru>"> <span class="fn">Daiver</span></a>
</span></b>
<pre>For all Taichi notebooks was updated Intel driver, which need to update BIOS.
TAICHI31:
BIOS 208
Fixed bug that outer panel can’t work after upgrade VGA driver for win8.1.
Intel Graphics Driver V10.18.10.3412
Without BIOS update external screen not work properly.
Full diff of DSDT previous and current:
6c6
< * Disassembly of dsdt.dat, Fri Dec 27 15:54:15 2013
---
<span class="quote">> * Disassembly of dsdt.dat, Wed Mar 19 14:52:17 2014</span >
10c10
< * Length 0x000133F4 (78836)
---
<span class="quote">> * Length 0x000133FC (78844)</span >
12c12
< * Checksum 0x19
---
<span class="quote">> * Checksum 0x87</span >
161c161
< OperationRegion (GNVS, SystemMemory, 0xDA8B3E18, 0x01D1)
---
<span class="quote">> OperationRegion (GNVS, SystemMemory, 0xDA8B2E18, 0x01D1)</span >
5548c5548
< Store (0x02F0, PARM)
---
<span class="quote">> Store (0x02F8, PARM)</span >
6627a6628
<span class="quote">> Store (0xF000, DSLP)</span >
10696c10697
< Name (_HID, "PNP0C14") // _HID: Hardware ID
---
<span class="quote">> Name (_HID, "pnp0c14") // _HID: Hardware ID</span >
15948c15949
< Store ("207", Local0)
---
<span class="quote">> Store ("208", Local0)</span >
There is reason to believe that the backlight control external panel with the
Intel driver through ACPI.</pre>
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