| 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 | chithanh@gentoo.org |
Created attach= ment 138570 [details] dmesg with cik_support=3D1 dc=3D1 When using kernel 4.16.0 and amdgpu with cik_support=3D1 dc=3D1 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=3D0 the screen lights up, but I cannot use amdgpu = for daily work due to bug 101926.
Created attach=
ment 138571 [details]
dmesg with cik_support=3D1 dc=3D0
Created attachment 138572 =
[details]
dmesg with radeon
Looks like we don't detect a display. Can you capture dmesg wi= th cik_support=3D1 dc=3D1 dc_log=3D1 to get more log info?
Created attachment 138620 [details]<=
/a>
dmest with cik_support=3D1 dc=3D1 dc_log=3D1
doesn't look all that different from the one without dc_log=3D1 to me
What physical connectors are on your board and which one(s) ar= e you using?
It is a notebook and I am using the internal LVDS panel.
The notebook also has HDMI and VGA connectors, but I do not us= e them currently.
| What | Removed | Added |
|---|---|---|
| URL | http:// |
| What | Removed | Added |
|---|---|---|
| CC | diwic@ubuntu.com |
Hi, I'm getting the same or similar error: * Black screen, no plymouth * "Cannot find any crtc or sizes" error in dmesg * amdgpu.dc=3D0 works around the issue ...and I might have a lead on it. The regression is between 4.15rc2 and 4.1= 5rc3 (found by downloading kernels from http://kernel.ub= untu.com/~kernel-ppa/mainline/).=20 The only one commit I could see being relevant between 4.15rc2 and 4.15rc3 = is this one: commit a703c55004e1c5076d57e43771b3e11117796ea0 Author: Daniel Vetter <dan= iel.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 d= id not? It seems like this could be the case, but only if (obj->free_cb =3D= =3D 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_c= b is present or not. Does all this make sense, or am I out on deep water here?
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=3Dfast >TAbort-=
<TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 46
Region 0: Memory at e0000000 (64-bit, prefetchable) [size=3D256M]
Region 2: Memory at f0000000 (64-bit, prefetchable) [size=3D2M]
Region 4: I/O ports at f000 [size=3D256]
Region 5: Memory at fe900000 (32-bit, non-prefetchable) [size=3D256=
K]
Expansion ROM at 000c0000 [disabled] [size=3D128K]
Capabilities: <access denied>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
(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?
Created attachment 138824 [details] dmesg from kernel 4.15 with cik_support=3D1 dc=3D1 dc_log=3D1 Going back to kernel 4.15 makes no difference for me. I think that the issue reported in comment 8 is differ= ent and should be reported in a separate bug. Though I noticed that in 4.15, dc_log=3D1 gives more output than in 4.16 wh= ere it doesn't make any difference.
So, with the additional dmesg output from kernel 4.15, the fol=
lowing 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 =3D 5
CONNECTOR_ID_LVDS =3D 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.
| What | Removed | Added |
|---|---|---|
| Summary | [dc][kabini] Cannot find any crtc or sizes | [dc] No support for LVDS or VGA connectors (Cannot find any = crtc or sizes) |
Ok, so display connected via HDMI will light up with kernel 4.= 16. The issue is therefore that DC lacks LVDS and VGA support.
Please try attachment 138813 [details= ] [review] on bug 105996.
(In reply to Michel D=C3=A4nzer from comment #10) > (In reply to David Henningsson from comment #8) > > The regression is between 4.15rc2 and 4.15rc3 >=20 > Any chance you can bisect between these two? I can, but it'll take a week or two at current speed... Also because the original reporter now seem to refer to something specific = to LVDS we probably have different bugs, unfortunately.
I tried with 4.16, made no difference. But as dc_log=3D1 on 4.= 16 gives no helpful additional output, I will try on Monday with 4.15 again. It may also be possible that I am affected both by the issue in this bug and what was repo= rted in comment 8 (but discussion ab= out which should be continued in a separate bug report).
Created attachment 138863 [details] dmesg from kernel 4.15 with att= achment 138831 [details] applied So I applied this patch from bug 105596 The "Unsupported Connector type:14" message is gone, the "Un= supported Connector type:5" is still there (as expected). However the screen stays blank and the "[drm] Cannot find any crtc or = sizes" message sill comes.
| What | Removed | Added |
|---|---|---|
| See Also | https://bugs.freedesktop.org/show_bug.cgi?id=3D105596 |
| What | Removed | Added |
|---|---|---|
| See Also | https://bugs.freedesktop.org/show_bug.cgi?id=3D105596 | https://bugs.freedesktop.org/show_bug.cgi?id=3D105996 |
(In reply to Michel D=C3=A4nzer from comment #10) > (In reply to David Henningsson from comment #8) > > The regression is between 4.15rc2 and 4.15rc3 >=20 > Any chance you can bisect between these two? So I did the bisection (which took some time) and it turned out empty. What tricked me was the fact that Ubuntu changed their kernel configs between 4.15rc2 and 4.15rc3, mainly by enabling CONFIG_DRM_AMD_DC_PRE_VEGA and CONFIG_DRM_AMD_DC_DCN1_0. This was the cause of regression for me rather th= an patches between rc2 and rc3.=20 Anyhow, it's probably a separate bug from this one, so sorry for the confus= ion.