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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: jan.burgmeier at 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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