[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

            Bug ID: 97896
           Summary: RADEON DisplayPort - Monitor shows out of range in
                    some modes
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: jan.burgmeier@unicon-software.com

Created attachment 126733
  --> https://bugs.freedesktop.org/attachment.cgi?id=126733&action=edit
dmesg output with drm.debug=0x1e log_buf_len=1M

Hi,

I have two monitors connected to my PC one via DVI and one via DP. The monitor
connected via DP shows "frequency out of range" when some modes including the
preferred one are used. This happens in X and in the KMS framebuffer. For
example on the attached logs the preferred mode of 1680x1050 does not work
where as 1680x945 works perfectly fine.

Kernel: 4.4.11
Xorg: 1.18.2
xf86-video-radeon: 7.7.0

Last working kernel: 3.19
First broken kernel: 4.0

Here is the bisect info, the 4.0 release segfaulted in the radeon driver but
the change which broke this was before so I hope the bisect is right:

# first bad commit: [e55bca26188e45f209597abf986c87cc5a49894a] radeon/audio:
enable DP audio

After finding the bad commit I tried booting with radeon.audio=0 this made the
display work for 3.19 kernel with that commit but did not work for the 4.4.11
kernel.

Attached log files:
 - dmesg output with drm.debug=0x1e log_buf_len=1M
 - lspci -vv output
 - video card bios
 - Xorg.0.log
 - xrander --verbose output

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

--- Comment #1 from Jan Burgmeier <jan.burgmeier@unicon-software.com> ---
Created attachment 126734
  --> https://bugs.freedesktop.org/attachment.cgi?id=126734&action=edit
lspci -vv

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

--- Comment #2 from Jan Burgmeier <jan.burgmeier@unicon-software.com> ---
Created attachment 126735
  --> https://bugs.freedesktop.org/attachment.cgi?id=126735&action=edit
video card bios rom

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

--- Comment #3 from Jan Burgmeier <jan.burgmeier@unicon-software.com> ---
Created attachment 126736
  --> https://bugs.freedesktop.org/attachment.cgi?id=126736&action=edit
Xorg log

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

--- Comment #4 from Jan Burgmeier <jan.burgmeier@unicon-software.com> ---
Created attachment 126737
  --> https://bugs.freedesktop.org/attachment.cgi?id=126737&action=edit
xrandr --verbose output

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

--- Comment #5 from Stefan Müller-Klieser <stefan.mueller-klieser@web.de> ---
I have probably the same issue on 4.14.5. My setup works fine with Redmond OS.
This thread helped me to find the workaround under Linux with radeon.audio=0.
One additional information about the issue:
The out of range error probably comes from a complete miscalculation of the
pixel clock. Edid of the monitor is fine, but in the error case, every pixel
clock, the radeon wants to setup, is completely off from the edid modes. I
checked by comparing the pixel clocks reported by the monitor with the one
radeon reports. I can test patches or post more debug info. Cheers.

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[Bug 97896] RADEON DisplayPort - Monitor shows out of range in some modes

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https://bugs.freedesktop.org/show_bug.cgi?id=97896

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

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

--- Comment #6 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/744.

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