Bug 36817

Summary: RV670 - Kernel fails to enable acceleration when RAM greater than 32-bit limit
Product: DRI Reporter: Fraggle <reg>
Component: DRM/RadeonAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED INVALID QA Contact:
Severity: normal    
Priority: medium CC: christopher.m.penalver
Version: unspecified   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Fraggle 2011-05-03 16:57:01 UTC 
I sure hope I'm in the right place...

Using a Radeon HD3870 that works fine under Windows (64-bit).  After a supposed initial success using a pre-release version of KMS drivers (which may be a red herring), I have been unable to get 3D acceleration on any Ubuntu release from Lucid, unless I use a non-PAE kernel (I have 4GB RAM).

My Ubuntu bug ticket (including logs) is here: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/574884

Another bug that looks similar: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/657576

A similar looking bug with a similar workaround (which I'll shortly try on mine) on SUSE: http://web.archiveorange.com/archive/v/wmeLDauZzOL6SFQx1uKY
Comment 2 Christopher M. Penalver 2016-02-26 06:10:26 UTC 
Original reporter hasn't responded to downstream information request in 2 years.

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