* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #1 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140840
--> https://bugs.freedesktop.org/attachment.cgi?id=140840&action=edit
Display mirroring available on 4.16.9 kernel
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--- Comment #2 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140841
--> https://bugs.freedesktop.org/attachment.cgi?id=140841&action=edit
417.png display mirroring unavailable in 4.17+ kernels
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--- Comment #3 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140842
--> https://bugs.freedesktop.org/attachment.cgi?id=140842&action=edit
Philips 55PUS6401 (4k TV) EDID dump
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--- Comment #4 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140843
--> https://bugs.freedesktop.org/attachment.cgi?id=140843&action=edit
BenQ G2420HDBL (monitor) EDID dump
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
Justinas Narusevicius <junaru@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #140840|Display mirroring available |416.png Display mirroring
description|on 4.16.9 kernel |available on 4.16.9 kernel
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Justinas Narusevicius <junaru@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #140841|417.png display mirroring |417.png Display mirroring
description|unavailable in 4.17+ |unavailable in 4.17+
|kernels |kernels
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
Alex Deucher <alexdeucher@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #140839|text/x-log |text/plain
mime type| |
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
did you find ac916c914c3156e53505e9ea3a9d1495518bf873 as the problematic by
bisection? If so, does reverting it fix the problem? If not, can you bisect
and verify that this is the actual commit that causes the problem?
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #6 from Justinas Narusevicius <junaru@gmail.com> ---
Hey Alex,
Yes ac916c914c3156e53505e9ea3a9d1495518bf873 was found by bisecting mainline
kernel between tags of v4.16 (0adb32858b0bddf4ada5f364a84ed60b196dbcda good)
and v4.17-rc1 (60cc43fc888428bb2f18f08997432d426a243338 bad)
I can confirm that reverting ac916c914c3156e53505e9ea3a9d1495518bf873 via the
attached patch on current mainline kernel HEAD
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cd3f77d74ac31b4627cdfa70812338076a1ea475)
fixes all three issues.
* Mirroring is available once again.
* Extended desktop mode can now use all the resolutions up to and including 4K.
* There's no 3rd erroneous display on HDMI-A-2 anymore.
Should i test this against
https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next or any
other specific branch?
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #7 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140853
--> https://bugs.freedesktop.org/attachment.cgi?id=140853&action=edit
Patch to revert the problematic commit
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
Alex Deucher <alexdeucher@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |harry.wentland@amd.com,
| |sunpeng.li@amd.com
--- Comment #8 from Alex Deucher <alexdeucher@gmail.com> ---
Harry, Leo, any objections to reverting this?
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--- Comment #9 from Harry Wentland <harry.wentland@amd.com> ---
That commit is correct. I don't think we should revert it. That said I don't
quite understand why it leads to issues.
Are you able to take another set of kernel logs from amd-staging-drm-next, both
with the regression commit and without, with drm.debug=0x4 set both times?
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--- Comment #10 from dwagner <jb5sgc1n.nya@20mm.eu> ---
(In reply to Harry Wentland from comment #9)
> That commit is correct. I don't think we should revert it. That said I don't
> quite understand why it leads to issues.
Isn't it strange that dc_link_detect goes on when
edid_status==EDID_BAD_CHECKSUM but does return when
edid_status==EDID_NO_RESPONSE? In both cases, one cannot expect to have read a
valid EDID from the display at hand, but if it's ok to continue with an invalid
EDID, why not also continue without one having been received?
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #11 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to dwagner from comment #10)
> (In reply to Harry Wentland from comment #9)
> > That commit is correct. I don't think we should revert it. That said I don't
> > quite understand why it leads to issues.
> Isn't it strange that dc_link_detect goes on when
> edid_status==EDID_BAD_CHECKSUM but does return when
> edid_status==EDID_NO_RESPONSE? In both cases, one cannot expect to have read
> a valid EDID from the display at hand, but if it's ok to continue with an
> invalid EDID, why not also continue without one having been received?
Harry, is the expert, but a lot of times, especially with TVs or receivers,
when adding the audio information, they forget to update the checksum, so the
data is actually good even if the checksum is bad.
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #12 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140916
--> https://bugs.freedesktop.org/attachment.cgi?id=140916&action=edit
amd-staging-drm-next-5bb19d15d8f2-boot.log
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #13 from Justinas Narusevicius <junaru@gmail.com> ---
Created attachment 140917
--> https://bugs.freedesktop.org/attachment.cgi?id=140917&action=edit
amd-staging-drm-next-5bb19d15d8f2-with-revert-patch-boot.log
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--- Comment #14 from Justinas Narusevicius <junaru@gmail.com> ---
(In reply to Harry Wentland from comment #9)
> That commit is correct. I don't think we should revert it.
You are probably correct. Some more things i have noticed:
When using Gnome Display Manager on pre
ac916c914c3156e53505e9ea3a9d1495518bf873 kernels my displays would always loose
signal for half a second after login and then come right back up.
Same 'signal flicker' (atleast form users perspective) could be observed on one
display when other was being turned on or powered off.
This no longer happens post ac916c914c3156e53505e9ea3a9d1495518bf873. The
transition form GDM login to desktop is smooth and i can even see the desktop
fadein animation.
> Are you able to take another set of kernel logs from amd-staging-drm-next,
> both with the regression commit and without, with drm.debug=0x4 set both
> times?
Logs are attached. Please let me know if i can do anything more to help.
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #15 from Harry Wentland <harry.wentland@amd.com> ---
Can you try passing this on your kernel command line (with the bad commit):
"video=HDMI-A-2:d"?
This will force HDMI-A-2 to report disconnected. I wonder if that helps.
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* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
2018-07-26 18:10 [Bug 107390] [BISECTED] EDID read failure breaks display mirroring bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #16 from Justinas Narusevicius <junaru@gmail.com> ---
(In reply to Harry Wentland from comment #15)
> Can you try passing this on your kernel command line (with the bad commit):
> "video=HDMI-A-2:d"?
>
> This will force HDMI-A-2 to report disconnected. I wonder if that helps.
It does! After forcefully disabling HDMI-A-2 everything looks to be working the
same way as on pre ac916c914c3156e53505e9ea3a9d1495518bf873 kernels.
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* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
2018-07-26 18:10 [Bug 107390] [BISECTED] EDID read failure breaks display mirroring bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #17 from Harry Wentland <harry.wentland@amd.com> ---
Looks like a faulty board that reports a port as connected when it shouldn't.
Windows driver has a policy to only report that as connected if it's DP, but
not for HDMI, which is likely why we've never spotted this before.
Do you have more information on your graphics card (manufacturer/model)?
Can you also print vbios_version?
As sudo:
cd /sys
cat $(find -name 'vbios_version')
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* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #18 from Harry Wentland <harry.wentland@amd.com> ---
Created attachment 140922
--> https://bugs.freedesktop.org/attachment.cgi?id=140922&action=edit
[PATCH] drm/amd/display: Report non-DP display as disconnected without EDID
Try this
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* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
2018-07-26 18:10 [Bug 107390] [BISECTED] EDID read failure breaks display mirroring bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
--- Comment #19 from Justinas Narusevicius <junaru@gmail.com> ---
(In reply to Harry Wentland from comment #17)
> Do you have more information on your graphics card (manufacturer/model)?
Its ASUS DUAL-RX580-O8G
https://www.asus.com/Graphics-Cards/DUAL-RX580-O8G/specifications/
> Can you also print vbios_version?
# cat $(find -name 'vbios_version')
115-D009PI2-101
# lspci|grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Ellesmere [Radeon RX 470/480/570/570X/580/580X] (rev e7)
> Try this
This solves the problem! Everything looks to be working fine again. Thank you!
If you need any more info I'll gladly help.
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* [Bug 107390] [BISECTED] EDID read failure breaks display mirroring
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https://bugs.freedesktop.org/show_bug.cgi?id=107390
Martin Peres <martin.peres@free.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |MOVED
Status|NEW |RESOLVED
--- Comment #20 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been
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