XPS 9550 + 4K panel screen flicker thread.

Let's get a list of who has the 4k panel & screen flicker at any brightness setting so I can present this to Dell the next time I call and they tell me they have never heard of this problem before (the default response)
If you have the FHD (1080) panel please don't reply as the initial fix seemed to be aimed at the FHD customers that in turn broke our 4k panels.
Dell may need to split the BIOS into 2 to fix specific panel types so we need to get a case going.

Please list the BIOS versions you tried, personally the A10 BIOS seems best for me and the latest official Dell intel driver.

so for me I live between 17-25% screen brightness indoors where I spend 99% of my time on the laptop.

• A10 works best, I have had to roll back to this.
• A11 causes a near constant flickering
• A12 is a little better but still at least 3 per minute

If you want to try older BIOS versions they are here http://downloads.dell.com/published/pages/xps-15-9550-laptop.html use Ctrl + F then search for BIOS.

 

I also have the screen flicker since A12 i think.... they released a new bios today Dell XPS 15 9550 1.2.13 A12 System BIOS, did you already try out this one?

 

I had to roll back to BIOS version 1.1.19! Version 1.2.10 caused flickering as well on my 4k panel.

The version 1.2.13 contains an update of the intel ME which can't be downgraded by flashing version 1.1.19. So be aware! By now I have not recognized anything bad from the latest update of the intel management engine.

 

Yes the IME update seems fine and I took the opportunity to flash the Thunderbolt while the BIOS was upgraded. 1.2.0 is as stable as 1.1.19 (not to be confused with 1.2.10)

 

Thanks GoNzo. Just reflashed to 1.2.0 !

 

I use A10 at 140cd/m² after calibration which is around 40% screen brightness.
Haven't noticed any flicker.
But I can give A12 a try and report when I am back from work.

I have A12 running now for 1h. Haven't noticed any flickering yet.

 

Have you tested it without it being plugged in? A12 was fine for me until I unplugged it.

 

Ah, I am using it 99% of the time plugged in.
I will test it on battery in the evening.

 

Urgh, A12 made my TB15 dock work, (wow!) but yep, screen flicker is back and driving me BONKERS again. I guess you just cant have it all.

P.s. I'm plugged in to power delivered by Thunderbolt cable from a TB15 dock, and this problem happens only when screen brightness is 40% or below. I have not tested running off just battery. Huh, just as typed that at 50% brightness I got a flicker. Damn.

EDIT: Happening at 60% as well. Seems to be getting worse?

EDIT 2: Happening at 70%, perhaps less frequent, but still there.

EDIT 3: Man, my eyes are burning up at 70%