Original commit message:
> ATM sending modifiers to clients prevents direct scanout for DRI3
> clients via Xwayland. Xwayland using the dma-buf feedback v4 Wayland
> protocol will solve that, but that might take a while yet to appear in
> the wild. Once that happens, this can be reverted.
>
> Direct scanout still works for native Wayland clients as well.
Xwayland got support for v4 in 23.1.0, thus let's reenable modifiers on
AMD.
This reverts commit 2f825f3a86.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3030>
Fix the following warnings reported by udevadm verify:
data/61-mutter.rules:2 Whitespace after comma is expected.
...
data/61-mutter.rules:116 Whitespace after comma is expected.
data/61-mutter.rules: udev rules check failed
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3011>
When modifiers are enabled on mutter on some of the older i915 systems observed
Black-screen on 2nd monitor during multi-head use cases, upon debugging observed
that disabling modifiers on these systems resolved the Black-screen issue:!1618.
This issue depends whether we have enough DBuf space to provide required bandwidth
for the userspace demands. Those platforms which have less Display Buffer, will
just have more chance to face lack of it. However it still depends on various
factors like amount of planes(i.e the more planes we have, the more we divide the buffer),
refresh rate, bpp and so on.
This affects watermark calculations and the minimum blocks required for at least
wm level 0. If we don't have sufficient ddb at least for wm0 for all planes in
the configuration then it is rejected.
Until we have TEST_ONLY commit solution is built we could make sure to disable
modifiers support on these older i915 systems based on udev rules defined in this commit.
This commit makes sure that modifiers are still usable on latest i915 systems.
List of PCI-IDs are referred from:
f8bf2a9a15/include/pci_ids/iris_pci_ids.h
Related: https://gitlab.gnome.org/GNOME/mutter/-/issues/1618
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2641>
ATM sending modifiers to clients prevents direct scanout for DRI3
clients via Xwayland. Xwayland using the dma-buf feedback v4 Wayland
protocol will solve that, but that might take a while yet to appear in
the wild. Once that happens, this can be reverted.
Direct scanout still works for native Wayland clients as well.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2637>
The only currently known issue with allocating scanout buffers with
modifiers is memory constraints in multi head setups. Heuristics for
handling that are not implemented, but since it doesn't apply to
anything but i915, remove the other drivers from the deny list.
The other drivers had modifiers disabled to marginally increase the
chance of becoming scanout-able when allocated by Xwayland.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2146>
Virtual Kernel Mode Setting (vkms) is a virtual /dev/dri/card* device
not backed by any actual hardware. It's intended for testing purposes,
e.g. to run tests suites with a reproducable setup, or in continuous
integration pipelines.
Currently mutter don't have any tests that can run on top of vkms, but
will eventually get that. To prepare for the ability to do that, and
having said kernel module loaded without causing wierd issues with any
active session, add an udev rule that tells mutter to ignore any vkms
device.
Otherwise, when vkms is loaded, mutter would detect it, assume it's a
regular monitor, configure it as such, thus add a region of the stage
that ends up nowhere, which isn't very helpful. It might also conflict
with running actual tests that need to interact with vkms if the active
session has taken control of it.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1740>
Lets wait until we have better ways to unredirect client buffers before
we start enabling KMS modifiers for amdgpu and nouveau; we end up with
mismatch between client buffer modifiers and primary plane modifier,
which right now needs to be the same for unredirection.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1792>
The intel DRM driver is known for not being able to handle multi head
setups when KMS modifiers are enabled, due to the implicitly selected
modifiers, while being more suitable for single head setups, cause
bandwidth issues when a certain number of monitor times resolution and
refresh rate is configured.
We don't yet support automatically finding a combination of modifiers
that work, and have because of this disabled KMS modifiers unless the
driver actually needs it.
Lets flip this configuration the other way around, changing the current
udev rule to decide wen to *disable* KMS modifier support, as it so that
only the Intel driver has this problem, while on the other hand, there
several drivers that requires modifiers to function at all.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1792>
