[Bug 26942] New: radeon: screen distortion on resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=26942

           Summary: radeon: screen distortion on resume
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: spoonb at exherbo.org
        Regression: Yes


With v2.6.37, the radeon KMS drivers, and my RV730 I get a distorted screen
when resuming from suspend to ram. This does not occur with v2.6.36 and I have
bisected to this commit:

-----------------------------------------------------------------------------

>From ba032a58d1f320039e7850fb6e8651695c1aa571 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexdeucher at gmail.com>
Date: Mon, 4 Oct 2010 17:13:01 -0400
Subject: [PATCH] drm/radeon/kms: rework spread spectrum handling

This patch reworks spread spectrum handling to enable it
properly on lvds and DP/eDP links.  It also fixes several
bugs in the old spread spectrum code.

-----------------------------------------------------------------------------

lspci -v

-----------------------------------------------------------------------------
03:00.0 VGA compatible controller: ATI Technologies Inc RV730 PRO [Radeon HD
4650] (prog-if 00 [VGA controller])
    Subsystem: PC Partner Limited Device 9498
    Flags: bus master, fast devsel, latency 0, IRQ 40
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at fb9e0000 (64-bit, non-prefetchable) [size=64K]
    I/O ports at ee00 [size=256]
    [virtual] Expansion ROM at fb900000 [disabled] [size=128K]
    Capabilities: [50] Power Management version 3
    Capabilities: [58] Express Legacy Endpoint, MSI 00
    Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
    Kernel driver in use: radeon

03:00.1 Audio device: ATI Technologies Inc RV710/730
    Subsystem: PC Partner Limited R700 Audio Device [Radeon HD 4000 Series]
    Flags: bus master, fast devsel, latency 0, IRQ 44
    Memory at fb9fc000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: [50] Power Management version 3
    Capabilities: [58] Express Legacy Endpoint, MSI 00
    Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
    Kernel driver in use: HDA Intel
-----------------------------------------------------------------------------

Let me know what else I can provide.

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