https://bugs.freedesktop.org/show_bug.cgi?id=36817

Summary: RV670 - Kernel fails to enable acceleration when RAM greater than 32-bit limit Product: DRI Version: unspecified Platform: x86 (IA32) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: reg@achart.me.uk

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