[Bug 97857] card detects non-existent monitor on display port

[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/Radeon               |DRM/Radeon
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
         QA Contact|xorg-team@lists.x.org       |
            Product|xorg                        |DRI

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
I'm seeing this as well (on mobile Kaveri), but I think it's more likely a
kernel driver issue. E.g. I only noticed this a few months ago, but I can
reproduce it with xf86-video-ati 7.6.1, which was released almost a year ago.

Can you try older kernels? If it doesn't happen with an older kernel, can you
narrow it down to at least the kernel version which introduced it, or ideally
bisect the Git commit which did?

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #7 from Daniel <danadam7@gmail.com> ---
> can you narrow it down to at least the kernel version which introduced it

But I did, in my description: "Since kernel 4.5.0-2 my Xorg.0.log shows that
something is also connected to display port...".

Up to 4.5.0-1 everything was fine.

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Daniel from comment #7)
> But I did, in my description: "Since kernel 4.5.0-2 my Xorg.0.log shows that
> something is also connected to display port...".
> 
> Up to 4.5.0-1 everything was fine.

Oops, sorry, I somehow missed that before. :(

I think the most likely culprit is

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ff0bd441bdfbfa09d05fdba9829a0401a46635c1

then, or maybe

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a738347df2ee4977459a8776fe2c62196bdcb1b

Can you try if reverting either of those fixes the problem?

Alex, any ideas?

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #9 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Michel Dänzer from comment #8)
> (In reply to Daniel from comment #7)
> > But I did, in my description: "Since kernel 4.5.0-2 my Xorg.0.log shows that
> > something is also connected to display port...".
> > 
> > Up to 4.5.0-1 everything was fine.
> 
> Oops, sorry, I somehow missed that before. :(
> 
> I think the most likely culprit is
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> ?id=ff0bd441bdfbfa09d05fdba9829a0401a46635c1
> 

I doubt this is the culprit.  The link training parameters aren't used until a
monitor is already detected.  This wouldn't result in a fake monitor showing
up.

> then, or maybe
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> ?id=1a738347df2ee4977459a8776fe2c62196bdcb1b

That is a possibility.

> 
> Can you try if reverting either of those fixes the problem?
> 
> Alex, any ideas?

Maybe some core drm/dp change?  Any chance you could bisect?

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #10 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Alex Deucher from comment #9)
> Maybe some core drm/dp change?  Any chance you could bisect?

I can try, but probably not before next week.

FWIW, according to the attached dmesg outputs, the regression happened between
upstream versions 4.5.1 and 4.5.5.

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Alex Deucher from comment #9)
> > [...] or maybe
> > 
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
> > ?id=1a738347df2ee4977459a8776fe2c62196bdcb1b
> 
> That is a possibility.

Indeed, reverting just this change fixes the problem for me.

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[Bug 97857] card detects non-existent monitor on display port

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https://bugs.freedesktop.org/show_bug.cgi?id=97857

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
Fixed in
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9dc79965b21967caebde575f5f5d8bf1aa2c23ab
.

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