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drm: disable all CRTCs on startup

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If the CRTC we've selected is being used on another connector,
our modeset fails.
This commit is contained in:
Simon Ser 2021-06-22 16:39:56 +02:00
parent 3e17ea2e6f
commit 5b3ea51f7b
1 changed files with 8 additions and 0 deletions
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8
src/drm.cpp
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@ -463,6 +463,14 @@ int init_drm(struct drm_t *drm, const char *device, const char *mode_str, unsign
} }
} }
// Disable all CRTCs. This ensures the CRTC we've selected isn't being used
// by another connector.
for (i = 0; i < resources->count_crtcs; i++) {
ret = drmModeSetCrtc(drm->fd, resources->crtcs[i], 0, 0, 0, nullptr, 0, nullptr);
if (ret != 0)
fprintf(stderr, "failed to disable CRTC %" PRIu32 ": %s", resources->crtcs[i], strerror(-ret));
}
drmModeFreeResources(resources); drmModeFreeResources(resources);
drm->connector_id = connector->connector_id; drm->connector_id = connector->connector_id;