AnsweredAssumed Answered

Framerate drop and/or amdkmdap not responding anymore when having two games/videos in fullscreen on two different screens (RX 470)

Question asked by norgannon on Jul 14, 2019
Latest reply on Aug 31, 2019 by norgannon

Hello !


I use two screens (extended displays) on Windows 10.


I noticed a couple of days/weeks ago that when I have two games/videos on full screen, one on each screen, one stays stable with a "normal" framerate but the other has awful fps drops. It used to work absolutely fine. I do not know what prompted this change.


It became worse quickly, as now, if I run a game on fullscreen (usually World of Warcraft) on my main screen, when I make video fullscreen on my secondary screen, it has a chance to make the amdkmdap not responding anymore. I get a black screen on both screens and nothing responds anymore. I can only force a shutdown if that happens. I know of the amdkmdap not responding because it leaves a warning in the evenement log. If the displays still respond, the game isn't really playable because of the fps drops.


What is odd is that if I have the game on fullscreen and the video not on fullscreen but still pretty big, with the same quality as it would have on fullscreen (usualy 1080p 60fps), there is no problem at all. It appears only when both displays run something fullscreen for some reason.


I tried to mess with the settings a bit, lowering quality of the game but it had no impact at all. I saw a similar post that said to deactivate freesync but freesync isn't even supported. I tried to disabled vertical sync but nothing changed. I updated the drivers but nothing changed. Radeon ReLive is disabled as it used to make my system randomly crash for some reason. It probably has nothing to do with it but I'll still mention it.


Also a detail that might have an importance : when I witness the fps drop, the fps counter doesn't show them. It says it still has 60+ fps. So that's weird.


  • GPU : Radeon RX 470
    • Sapphire Radeon RX 470 Nitro OC - 4 Go
  • Desktop
    • Kind of OEM from a specialized retailer (
  • Operating System
    • Windows 10 - 64 bits
  • Driver version installed
    • Radeon Software Adrenalin 2019 19.7.1
  • Display Devices
    • BenQ 21.5" LED - GL2250 - 1920 x 1080 pixels - 5 ms - 60Hz - HDMI
    • Philips S-line 221S6LCB - LED - 21.5" - 1920 x 1080 pixels - 5 ms - probably 60 Hz - DVI-D
  • Motherboard + Bios Revision
    • Gigabyte GA-B150M-DS3H - Bios version B150M-DS3H-F22f
    • intel i5-6400
  • Power Supply Unit  Make, Model & Wattage
    • FSP Fortron Hyper 500S - 500W
  • RAM
    • 24 Gb DDR4 (2*8 Gb + 2*4 Gb in dual channels)


Thanks a lot for any help you can provide !