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Posts: 1
Registered: ‎01-28-2018
Message 1 of 1 (359 Views)

VAIO Pro ultrabook screen flicker (intel hd 4400, windows 10)

[ Edited ]



I rarely use my computer on the go so I was shocked when the screen misbehaved the moment I pulled out the power cable.


This _may_ have been due to upgrading to Windows 10, but since I didn't test that immediately I am not sure.


The problem:

screen is blank of flickers very bad (half a second on, half a second off) when the power adapter is disconnected.



SVP1321GGXBI ; it has an 4200U i5 intel CPU, an Intel HD Graphics card (4400), 8GB RAM, 256GB SSD.


Already tried:

- Upgraded to last intel driver listed for Windows 10

- From Intel Graphics Control Panel, switch off the Display Power Saving Technology

- Switched Power Plans to 'High Performance'

- Vaio Control Center -> Disabled 'Adjust brightness automatically'

- Advanced power plan settings, checked that ambient light is off etc.


Most of these worked together to switch from a completly OFF display to a flickering one. I wasn't able to remove the flicker.


What I would want to try but don't know how / can't:

- Intel used to ship a Control Panel with an option to disable "Panel Self Refresh" (PSR). I couldn't find that option now.

- There may be registry keys to turn off the PSR, I didn't find them either.


Anyone has ideas what should I try next?

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