I'm also having the identical problem with external monitor connected via only HDMI. No problem with DisplayPort.
Screen does not wake up from sleeping when using refresh rate 240 Hz. It is fine with 60 Hz. My graphics card is RTX 2070 Mobile Using Ubuntu 20.04.3 LTS and Nvidia driver 470.86 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1911055 Title: [modeset][nvidia] suspend/resume broken in nvidia-460 : Display engine push buffer channel allocation failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-460/+bug/1911055/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
