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Firefox: Not using hardware acceleration by default
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You can see Firefox not using hardware acceleration because video playback in fullscreen is laggy. After enabling layers.acceleration.force-enabled in about:config, it works.

System specifications:
GTX 970 (running nvidia-glx-driver)
1x 4k screen
1x 1650x1050 screen

josephscade added a subscriber: josephscade.EditedNov 12 2018, 12:13 PM

Your issue seems to be related to T7127. Devs said they will enable it if someone tests layers.acceleration.force-enabled using linux-lts with an Nvidia graphic card. Maybe you can check it yourself. It would resolve this task and T7127.

bwat47 added a subscriber: bwat47.Nov 12 2018, 12:17 PM

Just tested this with a LTS kernel on my stable notebook, and I don't see any difference between current and LTS with gfx.render and acceleration set to true

Thank you for your comment, I'll report it in T7127.

AntiSC2 edited projects, added Software; removed Lacks Project.Nov 12 2018, 6:56 PM