[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 #15 from Daiver <daiver at daiver.ru> ---
Detected monitors :
 - Device: dev:/dev/i2c-7
   DDC/CI supported: No
   Monitor Name: VESA standard monitor
   Input type: Digital
 - Device: dev:/dev/i2c-6
   DDC/CI supported: No
   Monitor Name: VESA standard monitor
   Input type: Digital

LANG= ddccontrol -d dev:/dev/i2c-7

Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-7...
ioctl(): Remote I/O error
ioctl returned -1
ioctl(): Remote I/O error
ioctl returned -1
ioctl(): Remote I/O error
ioctl returned -1
I/O warning : failed to load external entity
"/usr/share/ddccontrol-db/monitor/CMN1346.xml"
Document not parsed successfully.
ioctl(): Remote I/O error
ioctl returned -1

DDC/CI at dev:/dev/i2c-7 is unusable (-1).

Cannot read no one register.

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