Comment 0 for bug 805211

I'm trying to use a AMD RADEON HD 6450 video card, but it fails to show a login screen, see screen photo attached.
I've tried different kernel (2.6.38-8, 2.6.38-10, 2.6.39-3) and driver versions (from main repository and from xorg-edgers ppa), no success.
The fglrx drivers makes a SegFault on my system. I tried to use vesa and removed packages, related to radeon, but it still does not show the login screen correctly, see the same screen photo.
In kern.log I see:

kernel: [ 6.345573] [drm:r600_ring_test] *ERROR* radeon: ring test failed (scratch(0x8504)=0xCAFEDEAD)
...
kernel: [ 8.981011] ------------[ cut here ]------------
kernel: [ 8.981032] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_gart.c:176 radeon_gart_bind+0x1ab/0x1c0 [radeon]()
kernel: [ 8.981034] Hardware name:
kernel: [ 8.981035] trying to bind memory to unitialized GART !
kernel: [ 8.981036] Modules linked in: snd_hda_codec_hdmi snd_usb_audio snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm snd_hwdep snd_usbmidi_lib snd_seq_midi snd_rawmidi hwmon_vid snd_seq_midi_event lm75 snd_seq coretemp snd_timer snd_seq_device radeon ttm drm_kms_helper keucr(C) snd psmouse usb_storage drm soundcore uas uvcvideo videodev xhci_hcd v4l2_compat_ioctl32 snd_page_alloc i2c_algo_bit serio_raw joydev lp shpchp parport usbhid hid ahci e1000e libahci
kernel: [ 8.981053] Pid: 298, comm: plymouthd Tainted: G C 2.6.38-10-generic #46-Ubuntu
kernel: [ 8.981054] Call Trace:
kernel: [ 8.981059] [<ffffffff81065cbf>] ? warn_slowpath_common+0x7f/0xc0
kernel: [ 8.981061] [<ffffffff81065db6>] ? warn_slowpath_fmt+0x46/0x50
kernel: [ 8.981066] [<ffffffffa018dd65>] ? ttm_mem_global_alloc_page+0x55/0x60 [ttm]
kernel: [ 8.981073] [<ffffffffa02124fb>] ? radeon_gart_bind+0x1ab/0x1c0 [radeon]
kernel: [ 8.981080] [<ffffffffa020fe82>] ? radeon_ttm_backend_bind+0x32/0x90 [radeon]
kernel: [ 8.981083] [<ffffffffa018e858>] ? ttm_tt_bind+0x58/0x80 [ttm]
kernel: [ 8.981086] [<ffffffffa0190904>] ? ttm_bo_handle_move_mem+0x194/0x3d0 [ttm]
kernel: [ 8.981089] [<ffffffff81155501>] ? kmem_cache_alloc_trace+0x61/0x120
kernel: [ 8.981092] [<ffffffffa0191982>] ? ttm_bo_move_buffer+0x142/0x160 [ttm]
kernel: [ 8.981101] [<ffffffffa011d69a>] ? drm_mm_get_block_generic+0x4a/0xb0 [drm]
kernel: [ 8.981104] [<ffffffffa0191a36>] ? ttm_bo_validate+0x96/0x120 [ttm]
kernel: [ 8.981106] [<ffffffffa0191c78>] ? ttm_bo_init+0x1b8/0x260 [ttm]
kernel: [ 8.981113] [<ffffffffa02111f7>] ? radeon_bo_create+0x147/0x2a0 [radeon]
kernel: [ 8.981119] [<ffffffffa0210f50>] ? radeon_ttm_bo_destroy+0x0/0xc0 [radeon]
kernel: [ 8.981127] [<ffffffffa022833c>] ? radeon_gem_object_create+0x8c/0x120 [radeon]
kernel: [ 8.981135] [<ffffffffa0228788>] ? radeon_gem_create_ioctl+0x58/0xd0 [radeon]
kernel: [ 8.981137] [<ffffffff811309aa>] ? handle_pte_fault+0xfa/0x210
kernel: [ 8.981141] [<ffffffffa0112384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
kernel: [ 8.981148] [<ffffffffa0228730>] ? radeon_gem_create_ioctl+0x0/0xd0 [radeon]
kernel: [ 8.981151] [<ffffffff815c6f78>] ? do_page_fault+0x258/0x540
kernel: [ 8.981153] [<ffffffff81134a58>] ? unmap_region+0x158/0x170
kernel: [ 8.981156] [<ffffffff811764cf>] ? do_vfs_ioctl+0x8f/0x360
kernel: [ 8.981158] [<ffffffff81176831>] ? sys_ioctl+0x91/0xa0
kernel: [ 8.981160] [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
kernel: [ 8.981161] ---[ end trace e4f80f4306a25281 ]---
kernel: [ 8.981163] [drm:radeon_ttm_backend_bind] *ERROR* failed to bind 2025 pages at 0x00000000
kernel: [ 8.981341] radeon 0000:01:00.0: object_init failed for (8294400, 0x00000002)
kernel: [ 8.981343] [drm:radeon_gem_object_create] *ERROR* Failed to allocate GEM object (8294400, 2, 4096, -22)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xserver-xorg-video-radeon (not installed)
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Sun Jul 3 23:01:07 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc NI Caicos [AMD RADEON HD 6450] [1002:6779] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:03dc]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-10-generic root=UUID=ca260b9b-380b-4b09-9c78-54901c6bb687 ro quiet splash vt.handoff=7
Renderer: Unknown
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2011
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BLH6710H.86A.0110.2011.0415.1506
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DH67BL
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG10189-205
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrBLH6710H.86A.0110.2011.0415.1506:bd04/15/2011:svn:pn:pvr:rvnIntelCorporation:rnDH67BL:rvrAAG10189-205:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.4+bzr20110606-0ubuntu1~natty1
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7