[Bug 34212] New: radeon: 3650 AGP lockup on radeon.ko load

[<bug...@bu...>]

https://bugzilla.kernel.org/show_bug.cgi?id=34212

           Summary: radeon: 3650 AGP lockup on radeon.ko load
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.39-rc5 + drm-next 1794d25
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: dri...@ke...
        ReportedBy: det...@gm...
        Regression: No


Hardware:
2x 1.7GHz Xeon (Foster) on a SuperMicro P4DC6 workstation board
RadeonHD 3650 AGP (built by VisionTek)

Radeon board has 1x VGA, 1x DVI, and 1x S-Video ports.  A TV is attached to the
S-Video port through a generic S-Video multiplexer, the others are not
connected.  TV is a US/NTSC standard definition CRT.

System boots into a VGA text console with no problem.  When attempting
"modprobe radeon", the system switches to graphics mode, then prints a
backtrace on the framebuffer and hangs (no keyboard response, no ping, ssh
dies).  A mostly-solid stripe of green pixel noise can be seen across the
bottom 2 or 3 scanlines of the TV.

The setup works when using the fglrx driver.  An NV31+nouveau arrangement also
seems to work, so I don't think the motherboard is at fault.  This isn't really
a "regression" per-se, as it has never worked in any vendor- or self-compiled
kernel I've tried (since about July 2010).

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