[Bug 57741] New: [regression] Resolution crippled for HD4870X2

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=57741

          Priority: medium
            Bug ID: 57741
          Assignee: dri-devel@lists.freedesktop.org
           Summary: [regression] Resolution crippled for HD4870X2
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: dev@blackshard.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 70837
  --> https://bugs.freedesktop.org/attachment.cgi?id=70837&action=edit
output of lspci -v

Using in-kernel DRM with my Radeon HD4870X2, resolutions above 1024x768 no
longer function.  Selecting a higher resolution results in a blank, black
screen.  Sometimes my monitor reports 'frequency out of range', but usually it
does not.  Xorg otherwise functions as normal - if I blindly pull up a terminal
and switch resolution via xrandr, I regain my display.  Various combinations of
xorg.conf options, including no xorg.conf at all, do not fix the problem.

This problem surfaced with v3.7.0-rc5, and is not fixed the version of DRM
present in current kernel git (3.7.0-rc7+).  The problematic file is
drivers/gpu/drm/radeon/atombios_crtc.c - using the version of this file
included in 3.7.0-rc4 resolves my problem.

Steps to Reproduce:
  Install kernel version > 3.7.0-rc4 on relevant hardware
  startx

Actual Results:
  Blank Screen

Expected Results:
  X should display my desktop, rather than shutting off my display.

Platform:
  Linux
  Xorg           1.8.2*
  xf86-video-ati 6.14.1*
  libdrm         2.4.26*
  mesalib        7.11.1*
  * Version of these packages does not appear relevant to this bug

Additional Information:
  See attached lscpi for my hardware
  dmesg and Xorg.0.log have not been attached, as their output is identical
between working and non-working versions of this file.
  I will happily provide any additional information or testing that would help
resolve this bug.

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