[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #12 from Chí-Thanh Christopher Nguyễn  ---
So, with the additional dmesg output from kernel 4.15, the following appeared
interesting:

[   43.356569] [drm] DC: create_links: connectors_num: physical:3, virtual:0
[   43.356583] [drm] Unsupported Connector type:14!
[   43.356588] [drm] Connector[1] description:signal 4
[   43.356617] [drm] Unsupported Connector type:5!

If I understand drivers/gpu/drm/amd/dal/dc/core/dc_link.c correctly, the
following connector types are supported in construct()

CONNECTOR_ID_HDMI_TYPE_A
CONNECTOR_ID_SINGLE_LINK_DVID
CONNECTOR_ID_SINGLE_LINK_DVII
CONNECTOR_ID_DUAL_LINK_DVID
CONNECTOR_ID_DUAL_LINK_DVII
CONNECTOR_ID_DISPLAY_PORT
CONNECTOR_ID_EDP

else the following code will print the above error message

dal_logger_write(dc_ctx->logger,
LOG_MAJOR_WARNING, LOG_MINOR_TM_LINK_SRV,
"Unsupported Connector type:%d!\n", link->link_id.id);

According to display/include/grph_object_id.h

CONNECTOR_ID_VGA = 5
CONNECTOR_ID_LVDS = 14

which would explain why no working connectors are found. I will try to find an
HDMI monitor to see if it lights up with amdgpu DC.

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #11 from Chí-Thanh Christopher Nguyễn  ---
Created attachment 138824
  --> https://bugs.freedesktop.org/attachment.cgi?id=138824=edit
dmesg from kernel 4.15 with cik_support=1 dc=1 dc_log=1

Going back to kernel 4.15 makes no difference for me. I think that the issue
reported in comment 8 is different and should be reported in a separate bug.

Though I noticed that in 4.15, dc_log=1 gives more output than in 4.16 where it
doesn't make any difference.

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #10 from Michel Dänzer  ---
(In reply to David Henningsson from comment #8)
> The regression is between 4.15rc2 and 4.15rc3

Any chance you can bisect between these two?

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #9 from David Henningsson  ---
Could add that my graphics card is an RX460:

23:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Device [1002:67ef] (rev cf) (prog-if 00 [VGA controller])
Subsystem: XFX Pine Group Inc. Device [1682:9460]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 
Kernel driver in use: amdgpu
Kernel modules: amdgpu

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

David Henningsson  changed:

   What|Removed |Added

 CC||di...@ubuntu.com

--- Comment #8 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 a703c55004e1c5076d57e43771b3e7796ea0
Author: Daniel Vetter 
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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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

shital kanoje  changed:

   What|Removed |Added

URL||http://

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #7 from Chí-Thanh Christopher Nguyễn  ---
The notebook also has HDMI and VGA connectors, but I do not use them currently.

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #6 from Chí-Thanh Christopher Nguyễn  ---
It is a notebook and I am using the internal LVDS panel.

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #5 from Alex Deucher  ---
What physical connectors are on your board and which one(s) are you using?

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

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https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #4 from Chí-Thanh Christopher Nguyễn  ---
Created attachment 138620
  --> https://bugs.freedesktop.org/attachment.cgi?id=138620=edit
dmest with cik_support=1 dc=1 dc_log=1

doesn't look all that different from the one without dc_log=1 to me

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #3 from Harry Wentland  ---
Looks like we don't detect a display. Can you capture dmesg with cik_support=1
dc=1 dc_log=1 to get more log info?

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #2 from Chí-Thanh Christopher Nguyễn  ---
Created attachment 138572
  --> https://bugs.freedesktop.org/attachment.cgi?id=138572=edit
dmesg with radeon

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

--- Comment #1 from Chí-Thanh Christopher Nguyễn  ---
Created attachment 138571
  --> https://bugs.freedesktop.org/attachment.cgi?id=138571=edit
dmesg with cik_support=1 dc=0

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[Bug 105880] [dc][kabini] Cannot find any crtc or sizes

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105880

Bug ID: 105880
   Summary: [dc][kabini] Cannot find any crtc or sizes
   Product: DRI
   Version: XOrg git
  Hardware: Other
OS: All
Status: NEW
  Severity: normal
  Priority: medium
 Component: DRM/AMDgpu
  Assignee: dri-devel@lists.freedesktop.org
  Reporter: chith...@gentoo.org

Created attachment 138570
  --> https://bugs.freedesktop.org/attachment.cgi?id=138570=edit
dmesg with cik_support=1 dc=1

When using kernel 4.16.0 and amdgpu with cik_support=1 dc=1 on Kabini (A4-1200)
the screen will become blank once the module is loaded.

dmesg has the following error:
[drm] Cannot find any crtc or sizes

With radeon or amdgpu.dc=0 the screen lights up, but I cannot use amdgpu for
daily work due to bug 101926.

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