@Antoine I did need to `sudo chmod 666 /dev/dri/renderD128` to reproduce this issue on Questing (since it's required to allow RDP to use the GPU), just FYI. I'll update the test plan accordingly.
** Description changed: There is image distorsion in gnome-remote-desktop when a Blackwell GPU is in use and NVENC is responsible for the video streaming. Upstream issue: https://gitlab.gnome.org/GNOME/gnome-remote- desktop/-/issues/263 A fix was just released by nvidia upstream, and also backported to GNOME 48: https://gitlab.gnome.org/GNOME/gnome-remote-desktop/-/merge_requests/344 https://gitlab.gnome.org/GNOME/gnome-remote-desktop/-/merge_requests/346 --------------------------- SRU Justification: [ Impact ] * This is a hardware enablement SRU. * gnome-remote-desktop, when used alongside NVENC for video streaming, simply does not work, because the image is broken. * With the above, the streaming is fixed. [ Fix ] * Nvidia devices never supported `NV_ENC_PARAMS_FRAME_FIELD_MODE_MBAFF`. Though the code worked for past, it causes interlaced line artifacts on Blackwell GPUs. * Using `NV_ENC_PARAMS_FRAME_FIELD_MODE_FRAME` and changing `grd-cuda-avc-utils` to produce progressive frames works on Blackwell and on older GPU generations. [ Test Plan ] 1. Use a DUT that has a Blackwell GPU (https://en.wikipedia.org/wiki/Blackwell_(microarchitecture)#Blackwell_dies) 2. Enable Remote Login from the Gnome Settings on the DUT with a monitor plugged in. - 3. Install Reminna from Snap. This version supports NVENC, the .deb does - not. + 3. Install Reminna from Snap (via the edge channel) on your client. This + version supports NVENC, the .deb does not. On the server, run `sudo + chmod 666 /dev/dri/renderD128` to enable GPU acceleration with RDP. 4. Test gnome-remote-desktop with and without the fix. Make sure which backend is in use. This can be checked by running `nvidia-smi dmon` and observing an encoder activity >0%. The repro only occurs when the NVENC path is used. CPU encoding path or non-H264 streaming is unaffected 5. Run the same test without a monitor plugged in to the DUT. 6. Run the same tests (with and without monitors) on an older GPU generation (Maxwell, ideally) [ Where problems could occur ] * Given the nature of the fix, it should not impact non-nvidia machines. * Also, the fix comes from nvidia themsleves, and it's in GNOME 48 and 49 already, so it's pretty safe. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2127792 Title: Images are corrupted on blackwell GPUs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-remote-desktop/+bug/2127792/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
