[Bug 73156] Dual onboard LCD (eDP1 and DP1) cannot turn on DP1 (no backlight), no backlight control but can see screen in reflected light

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73156

--- Comment #20 from Daiver <daiver at daiver.ru> ---
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
---
>  * Disassembly of dsdt.dat, Wed Mar 19 14:52:17 2014
10c10
<  *     Length           0x000133F4 (78836)
---
>  *     Length           0x000133FC (78844)
12c12
<  *     Checksum         0x19
---
>  *     Checksum         0x87
161c161
<     OperationRegion (GNVS, SystemMemory, 0xDA8B3E18, 0x01D1)
---
>     OperationRegion (GNVS, SystemMemory, 0xDA8B2E18, 0x01D1)
5548c5548
<                             Store (0x02F0, PARM)
---
>                             Store (0x02F8, PARM)
6627a6628
>                     Store (0xF000, DSLP)
10696c10697
<             Name (_HID, "PNP0C14")  // _HID: Hardware ID
---
>             Name (_HID, "pnp0c14")  // _HID: Hardware ID
15948c15949
<             Store ("207", Local0)
---
>             Store ("208", Local0)

There is reason to believe that the backlight control external panel with the
Intel driver through ACPI.

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