| What | Removed | Added |
|---|---|---|
| CC | diwic@ubuntu.com |
Comment # 8
on bug 105880
from David Henningsson
Hi, I'm getting the same or similar error: * Black screen, no plymouth * "Cannot find any crtc or sizes" error in dmesg * amdgpu.dc=0 works around the issue ...and I might have a lead on it. The regression is between 4.15rc2 and 4.15rc3 (found by downloading kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/). The only one commit I could see being relevant between 4.15rc2 and 4.15rc3 is this one: commit a703c55004e1c5076d57e43771b3e11117796ea0 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Dec 4 21:48:18 2017 +0100 drm: safely free connectors from connector_iter ...it seems relevant because the error I get is "Cannot find any crtc or sizes", and the code emitting this error message (in drivers/gpu/drm/drm_fb_helper.c) deals with connectors. So could this commit cause connectors to be freed where the previous code did not? It seems like this could be the case, but only if (obj->free_cb == NULL) - drm_connector_put checks for a obj->free_cb being null whereas drm_connector_put_safe decrements a refcount regardless of whether a free_cb is present or not. Does all this make sense, or am I out on deep water here?
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