[Bug 329266] [NEW] tiiling is never enabled reducing video performance

[Luis Silva]

Public bug reported:

In jaunty there was a video performance regression relatively to gutsy. Looking at the output of dmesg I found:
[   31.371230] [drm] Initialized drm 1.1.0 20060810
[   31.392534] [drm:i915_gem_detect_bit_6_swizzle] *ERROR* Couldn't read from MCHBAR.  Disabling tiling.
[   31.392773] [drm] Initialized i915 1.6.0 20080730 on minor 0

and from grep '(EE)' /var/log/Xorg.0.log I get:
[    2.679616] (EE) intel(0): Failed to set tiling on front buffer: rejected by kernel
[    2.682539] (EE) intel(0): Failed to set tiling on back buffer: rejected by kernel
[    2.682660] (EE) intel(0): Failed to set tiling on depth buffer: rejected by kernel
[   21.951492] (EE) intel(0): Mode 1280x1024 does not fit virtual size 800x800 - internal error
[  741.801804] (EE) intel(0): Mode 1280x1024 does not fit virtual size 800x800 - internal error

This is an asus eeepc 701 4G.
>lsb_release -rd
Description:    Ubuntu jaunty (development branch)
Release:        9.04

>uname -a
Linux neo 2.6.28-7-generic #20-Ubuntu SMP Mon Feb 9 15:43:21 UTC 2009 i686 GNU/Linux

Relevant part of lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 04)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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tiiling is never enabled reducing video performance
https://bugs.launchpad.net/bugs/329266
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