Comment # 5
on bug 93784
from bartos.petr@gmail.com
(In reply to Nicolas Koch from comment #4) > Forgot to mention, of course I ran glxinfo with DRI_PRIME=1 Same problem here with ThinkPad L450 05:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Jet XT [Radeon R5 M240] (rev ff) I found than setting both integrated and discrete gpu to DRI3 allows to run glxgears, however it hard-freezes once any gpu intensive application is run for more than few minutes. Using additional vblank_mode=0 causes this hard-freeze to appear faster. Before hard-freeze there is massive fps drop during which it is possible to kill the application and avoid freeze. Also using echo "DDIS" > /sys/kernel/debug/vgaswitcheroo/switch and restarting X causes black screen (with backlight turned of) but that might be another bug
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