[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

            Bug ID: 100726
           Summary: [REGRESSION][BISECTED] Severe flickering with an R9
                    290
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: hiwatari.seiji@gmail.com

As of the commit:
    d8d1721cfb3162abbda078d67a928792d6552b84 : A series of fixup patches meant
to fix the usage of DMA on stack, plus one warning fixup

My R9 290 produces heavy flickering artifacts in 1 of 3 or 4 cases when
starting Linux.
I am using the amdgpu kernel module, and have not tested this with radeon.
When the bug occurs, the system is completely unusable.

Since the occurence of this bug is not really deterministic, bisecting it was
not that easy. I hope I didn't make any mistake.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #1 from hiwatari.seiji@gmail.com ---
Created attachment 130926
  --> https://bugs.freedesktop.org/attachment.cgi?id=130926&action=edit
Short video showing the issue

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
It's unlikely that this is caused by the bisected commit. You'll need to test
longer before declaring a commit as good.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #3 from hiwatari.seiji@gmail.com ---
This seems to have been fixed somewhere between 4.10.8 and 4.10.11.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

hiwatari.seiji@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #4 from hiwatari.seiji@gmail.com ---
I was wrong, unfortunately. This error is still present.
A friend of mine is having the same problem with a Fury X card.

So I did another bisect, waiting longer before declaring a commit as good.
But at some point, the build always crashed with:

kernel/built-in.o: In function `update_wall_time':
(.text+0x52c37): undefined reference to `____ilog2_NaN'
make: *** [Makefile:961: vmlinux] Error 1

So I had to skip all remaining commits.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #5 from hiwatari.seiji@gmail.com ---
Created attachment 135725
  --> https://bugs.freedesktop.org/attachment.cgi?id=135725&action=edit
New Bisect log

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #135725|text/x-log                  |text/plain
          mime type|                            |

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
None of those commits look even remotely related, so I'm afraid you still
incorrectly labelled at least one bad commit as good.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #7 from hiwatari.seiji@gmail.com ---
I already waited at least 1 week, before marking a commit as good. I guess I
will have to try 2 weeks this time. This is going to take ages.

Are you sure, that b7d91c915290ab0bfbab84a0fb9c9eae57816982 is definitely not
the cause?

Maybe some helpful information regarding the bug:

- It appears noticably more often, when rebooting to Linux after gaming in a
dual-booted Windows.
- When booting, the virtual console disappears, the screen displays black, the
login-manager appears. When the flickering does not appear, the black-sequence
(mode-setting?) takes noticably longer, than when the flickering appears.
- We both have two displays. One connected through HDMI, one through
DisplayPort.
- I have two 2K screens, the Fury X-User has one 4K and one FullHD screen.
- We both have the login-manager SDDM
- For me, when booting the machine (BIOS) - the screen resolution of GRUB is
quite random. Sometimes, it's using the native screen resolution, sometimes it
is using a very reduced resolution. Sometimes, it's only displaying on one of
the two screens, sometimes it's displaying on both. But that wasn't a problem
before linux-4.9.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to hiwatari.seiji from comment #7)
> Are you sure, that b7d91c915290ab0bfbab84a0fb9c9eae57816982 is definitely
> not the cause?

At least 99% sure. Pure merge commits are almost never a correct bisection
result.


> - For me, when booting the machine (BIOS) - the screen resolution of GRUB is
> quite random. Sometimes, it's using the native screen resolution, sometimes
> it is using a very reduced resolution. Sometimes, it's only displaying on
> one of the two screens, sometimes it's displaying on both. But that wasn't a
> problem before linux-4.9.

This is before the Linux kernel is even loaded, so it can hardly be directly
related to it.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #9 from hiwatari.seiji@gmail.com ---
My last try of bisecting the error. I'm pretty sure I've got the correct commit
this time. I first ran 4 Weeks on the 4.9-rc1 without the error ever appearing,
upgraded to one or two release candidates higher, rebooted and instantly had
the error. I then did the bisecting in this window, waiting 3-4 Weeks for the
error to appear per commit, before flagging the kernel as ok.

Git then tells me, that 5f7f8f6edbf860abf18149a64be036d4be5e2993 is the first
bad commit.
I will attach the new bisect log. I don't know if the error might already have
been fixed, since I've been months on this ancient version. But I will try that
in the following weeks.

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #10 from hiwatari.seiji@gmail.com ---
Created attachment 138086
  --> https://bugs.freedesktop.org/attachment.cgi?id=138086&action=edit
Bisect Log 3

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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--- Comment #11 from hiwatari.seiji@gmail.com ---
I can confirm this is still a problem (tested 4.15.10).

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https://bugs.freedesktop.org/show_bug.cgi?id=100726

--- Comment #12 from Jan Vlug <jan.public@famvlug.nl> ---
Maybe related to:
https://gitlab.gnome.org/GNOME/mutter/issues/22

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[Bug 100726] [REGRESSION][BISECTED] Severe flickering with an R9 290

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Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|REOPENED                    |RESOLVED

--- Comment #13 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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You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/154.

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