Comment 5 for bug 351756

Created an attachment (id=24805)
xorg.0.log

System Environment:
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Host: x-aspire1
Arch: i386
Platform: acer aspire1
Kernel_version: 2.6.29.1
Libdrm: (master)07646002c6835537c6ae44ef9b3f8480762279b8
Mesa: (mesa_7_4_branch)de197cf991416f0cd65ad2e2d2ca9aa599b52075
Xserver: (server-1.6-branch)60c161545af80eb78eb790a05bde79409dfdf16e
Xf86_video_intel: (2.7)121bd7ff7cfd9a43fbb61fa56f06ba2d2b55035e
Kernel: (drm-intel-2.6.29)0aa7e8a61658193f90198d579c5ef8297b45be9b

Bug detailed description:
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If I start X with the virtual size (>2048x2048) on i915 platfroms,it crashes with errors as below:

(EE) intel(0): Cannot support > 2048 vertical lines. disabling acceleration.
(EE) intel(0): Failed to init memory manager
Setting master
failed to add fb

Dmesg shows:
[drm:drm_mode_addfb] *ERROR* mode new framebuffer width not within limits

this issue happens on 855gm,915gm,945gm and aspire1. but works well on g45,gm965 and gm45.

reproduce steps:
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1.xinit&