> > Hi, > > qxl kms driver has been converted over to atomic mode setting recently. > Caused some problems, most are fixed meanwhile. > > See https://bugzilla.kernel.org/show_bug.cgi?id=196777 > > One pretty fundamental issue sticks though: The qxl virtual hardware > doesn't support pageflip (see comment 11 in the bug linked above). > Which is a problem for wayland because it is a heavy pageflip user. > > The kernel driver has to go though a destroy-primary-surface + create- > primary-surface cycle, which causes visible flicker because spice > client goes into "waiting for display ..." mode temporarily. > > So, the options I see are: > > (1) Declare qxl deprecated, promote virtio-vga instead. > > (2) Pimp the qxl hardware, add page-flip support. Requires changes > in spice-server (due to lazy rendering), qemu qxl emulation and > guest kernel driver. Should be transparent to spice-client and > guest userspace (aka xorg qxl driver). > > (3) Paper over the issue in the spice client, i.e. only go into > "waiting for display ..." mode in case the destroy-primary- > surface message isn't followed by a create-primary-surface > message within a short timeframe. > > Comments? Other suggestions? > > cheers, > Gerd > I don't think that supporting page flipping in QXL would be hard. Would just requires to support calling create surface having a surface and detecting that only the pointer changes. Requires an extra capability flag as old servers are not compatible but seems a good way. Frediano _______________________________________________ Spice-devel mailing list Spice-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/spice-devel