[Bug 28016] New: [REGR] RV635 GPU lockup after enabling unmappable VRAM V2 (KMS, Radeon)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28016

           Summary: [REGR] RV635 GPU lockup after enabling unmappable VRAM
                    V2 (KMS, Radeon)
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: astronomo at op.pl


Created an attachment (id=35492)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35492)
kernel log with the backtrace

I have tested recent branches drm-radeon-testing (last commit
7a1ffce50373c177d3f6eecce52badc40c90e1dd) and drm-next (last commit
9e51159c14c29ebd485a45ba56f148e180d62c29) from
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git.  These branches
contain patches for enabling unmappable VRAM. However, soon after booting I am
getting a GPU lockup and corrupted console and X.

My hardware is laptop ASUS M50SA with 4GB system memory, and graphics 1GB
Mobility Radeon HD 3650.

I am attaching the kernel output with the backtrace and lspci -v output.

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