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onscreen/native: Fall back if COPY_MODE_SECONDARY_GPU fails to init

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This can happen if we've got a GBM driver that is incomplete or
buggy for any reason. Currently this includes the Nvidia driver
when used as a secondary GPU, and as soon as they fix that it will
use the fast path instead.

Falling back means we can still use it as a KMS device with all rendering
done on the primary GPU instead. Just like a DisplayLink.

It's slow, but at least the screens all light up now and you get a
usable desktop. Surprisingly it's still a better experience than using
Xorg, maybe because we can flip the outputs independently with the
native backend.

Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2166,
       https://gitlab.gnome.org/GNOME/mutter/-/issues/2182,
       https://launchpad.net/bugs/1959888,
       https://launchpad.net/bugs/1964037

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2341>
This commit is contained in:
Daniel van Vugt 2022-03-11 17:23:55 +08:00 committed by Marge Bot
parent 41bfabad96
commit 8354289650
1 changed files with 16 additions and 6 deletions
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22
src/backends/native/meta-onscreen-native.c
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@ -2063,6 +2063,7 @@ init_secondary_gpu_state (MetaRendererNative *renderer_native,
MetaOnscreenNative *onscreen_native = META_ONSCREEN_NATIVE (onscreen);
MetaGpu *gpu = meta_crtc_get_gpu (onscreen_native->crtc);
MetaRendererNativeGpuData *renderer_gpu_data;
g_autoptr (GError) local_error = NULL;
renderer_gpu_data = meta_renderer_native_get_gpu_data (renderer_native,
META_GPU_KMS (gpu));
@ -2070,12 +2071,21 @@ init_secondary_gpu_state (MetaRendererNative *renderer_native,
switch (renderer_gpu_data->secondary.copy_mode)
{
case META_SHARED_FRAMEBUFFER_COPY_MODE_SECONDARY_GPU:
if (!init_secondary_gpu_state_gpu_copy_mode (renderer_native,
onscreen,
renderer_gpu_data,
error))
return FALSE;
break;
if (init_secondary_gpu_state_gpu_copy_mode (renderer_native,
onscreen,
renderer_gpu_data,
&local_error))
return TRUE;
g_warning ("Secondary GPU initialization failed (%s). "
"Falling back to GPU-less mode instead, so the "
"the secondary monitor may be slow to update.",
local_error->message);
renderer_gpu_data->secondary.copy_mode =
META_SHARED_FRAMEBUFFER_COPY_MODE_ZERO;
G_GNUC_FALLTHROUGH;
case META_SHARED_FRAMEBUFFER_COPY_MODE_ZERO:
/*
* Initialize also the primary copy mode, so that if zero-copy