[Bug 83742] New: [radeonsi KMS] Monitors on DP outputs not enabled

[Bug 83742] New: [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

          Priority: medium
            Bug ID: 83742
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [radeonsi KMS] Monitors on DP outputs not enabled
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: RalfPeter.Rohbeck@quantum.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

I've been running with 4 monitors on my 7850 for a long time but after a Debian
jessie upgrade the two monitors on the DP outputs are no longer enabled.

Please see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=760881

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
Can you bisect?

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #2 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
I can but I don't think it's caused by the kernel driver alone since even older
kernels like 3.14 do this now and it used to work in the past with 3.14 through
3.16.

Maybe somebody can give me a hint as to what to look for and have a look at the
logs.

I also want to run a jessie fresh install and see if a fresh start will make a
difference.

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #3 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
Looking for older kernels I found 3.13-0.bpo.1-amd64 and voila, it fixed the
behavior.
Then I booted 3.14-2 and 3.16-1 and both worked again!
I compared the initramfs for 3.16-1 before and after and the only changes were
in etc/modprobe.d/radeon-kms.conf and etc/boottime.kmap.gz but copying those
changes by hand into the now-working initramfs did not duplicate the failure.

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #4 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
Resolution to the mystery: It seems that I had changed /etc/default/grub before
today's testing but not run update-grub. When I installed the 3.13-0.bpo.1
kernel the kernel command lines were fixed.

What caused the original failure were the explicit mode settings I had on the
kernel command line, namely "video=DP-1:2560x1440-24@60e
video=DP-2:2560x1440-24@60e video=DVI-0:2560x1440-24@60e". I had to add those
settings in the past (see https://bugs.freedesktop.org/show_bug.cgi?id=72167.)
Without them settings it works.

I'll attach some kern.logs - there all sorts of interesting things going on
that are apparently needed to get the DP outputs up and running with my DP->DVI
converters. Setting the resolutions explicitly keeps those interesting things
from happening.

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #5 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
Created attachment 106309
  --> https://bugs.freedesktop.org/attachment.cgi?id=106309&action=edit
kern.log with explicit settings; monitors don't work

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #6 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
Created attachment 106310
  --> https://bugs.freedesktop.org/attachment.cgi?id=106310&action=edit
kern.log without explicit mode settings on kernel line; monitors work

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

--- Comment #7 from Ralf-Peter Rohbeck <RalfPeter.Rohbeck@quantum.com> ---
I can reproduce this at will now; let me know if I should run more tests.

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[Bug 83742] [radeonsi KMS] Monitors on DP outputs not enabled

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https://bugs.freedesktop.org/show_bug.cgi?id=83742

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

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

--- Comment #8 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
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/529.

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