are there any error message in system log about the graphic complain
EDID
http://cgit.freedesktop.org/xorg/app/edid-decode/tree/edid-decode.c
Manufacturer: LGD Model 323 Serial Number 0
Made week 0 of 2012
EDID version: 1.4
Digital display
6 bits per primary color channel
DisplayPort interface
Maximum image size: 35 cm x 19 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4, YCrCb 4:2:2
First detailed timing is preferred timing
Established timings supported:
Standard timings supported:
Detailed mode: Clock 138.000 MHz, 345 mm x 194 mm
1920 1952 1988 2088 hborder 0
1080 1085 1090 1102 vborder 0
-hsync -vsync
Manufacturer-specified data, tag 0
ASCII string: LG
ASCII string: LP156WF4
Checksum: 0x69 (valid)
EDID block does NOT conform to EDID 1.3!
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https://bugs.launchpad.net/bugs/1256655
Title:
[Gazelle Professional, Intel Haswell HDMI, Digital Out, HDMI] Playback
problem, built in speakers work but no audio over HDMI
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