@HG I have the same problem here. Old 2008 MBP actually, but still a workhorse minus battery life.
Here's an WEBM and GIF link I recorded crudely with my phone:
http://giant.gfycat.com/HatefulAdvancedHypsilophodon.gif (note: 11mb GIF, 28x smaller is link above)
Specs: 15.4" 1400x900 Built-in Display (no Retina), dedicated NVIDIA GeForce 9400M 256mb graphics card
2.8 GHz Intel Core 2 Duo
8G GB 1067 MHz DDR3 memory (back when you could swap out the RAM, ha! upgrades!)
One built in display, one 24" Asus external monitor.
Screenshot galleries of my Laptop "About this Mac" and displays versions link below. There are no "Ambient" light settings available in my Display preferences menu options as far I can tell; either my laptop is too old to support that bit of hardware or something but I get the same flickering problem described in "Movie Mode" on El Capitan 10.11.0. F.lux version 36.3.
This looks like the Ambient Light Compensation issue, but we thought Apple had pulled it from El Capitan, so we took out our workaround.
The last build with this fix was 36.0 - so try this one and see if it helps? It has a lot of bugs we fixed (but they are reasonably minor).
@herf, I confirm that in my case, Flux36.0.zip does not have the flashing problem
@herf I am on version 36.3. The Ambient Light Compensation option does not show up in display prefrences. I am guessing that it did not make the final cut for el capitan and Apple yanked it .
@herf I just installed v36 from your link and it seems to fix the issue with flashing. Thanks.
Can either of you post the Apple Menu->About This Mac "version" number?
So if you are on the GM there must be some cases where the behavior is there but not something you can turn off.
Here are my specs
RMBP - early 2013
OS X El Capitan
I just found this thread after experiencing the flashing issue in both movie mode and darkroom mode on El Capitan on my Early 2011 13" MBP in 36.3. I can confirm the 36.0 version that herf posted does not have this issue, so I've downgraded to it.
Thanks for a great product guys!
Posted from a darkroom-mode set MBP at 11pm on my second day of daylight savings (so darkroom-mode very much needed).
OS X 10.11 (15A284), and I never used the preview builds.
This is on an MBP with a NVIDIA GeForce 8600M GT 256 MB GPU, doesn't have integrated GPU, just discreet.
Just to resume:
With v. 36.3 I get the flashing problem if I turn on any of the 'Color Effects' at any time of the day.
With v. 36.0 the problem is gone.
Version 36.0 downgrade movie mode flashing problem almost goes away.... I still get one flash (tolerable!) before it settles into movie mode color level completely. Thanks for the tip. Hope there's enough information here to help you resolve and track down the issue!
Merged all the fixes into a new build - please try:
Working well here so far, thanks!
For those still having trouble: a reboot AND 36.4 seems to be the magic combination.
The issue with flickering when wake up the machine from Stand-by - issue still persists in even in the latest update.
When the flashing happens there is a log:
2015-08-14 1:42:47.991 AM Flux: Display list confused, doing full reset.