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Less colors after Display sleep

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Sep 30, 2014
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Motherboard
Asus k550jk-xo003h (MoBo x550jk) + Clover
CPU
i7-4710HQ - HM86
Graphics
nVidia GTX 850m (disabled) + Intel HD 4600 - 1366x768
Mac
  1. 0
Classic Mac
  1. 0
Mobile Phone
  1. Android
Every time I turn the display into sleeping mode, after the wake It seems like there are 16 bit colors instead of 32 bit. This happens even when I attach an external monitor. I can't understand if it is a sleep/wake problem or a graphical problem..
 
Every time I turn the display into sleeping mode, after the wake It seems like there are 16 bit colors instead of 32 bit. This happens even when I attach an external monitor. I can't understand if it is a sleep/wake problem or a graphical problem..

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System: manufacturer/model + bootloader(Clover/Chameleon/Chimera)
CPU: detailed CPU model + motherboard chipset
Graphics: all graphics devices + laptop internal screen resolution

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System: HP ProBook 4540s (Clover)
CPU: i5-3320m/HM76
Graphics: HD4000, 1366x768

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Signature updated.
 
Is it correct now?
 
Does this happen only after waking from display sleep? or can you see it barely visible in translucent areas like login, launchpad etc?
 
it happens only when I wake from display sleep. to fix this I must reboot the system :/

this I see after the wake:
IMG_20150125_180941.jpg
 
Also, if you find any solution do let me know.
 
I think they are similar (or the same), but I really don't know what to do..
 
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