Running Ubuntu dapper, with the latest CVS version of
http://webcvs.freedesktop.org/xorg/driver/xf86-video-ati/ installed. The PCI ID
of my graphics card is (1002:)5d4f, which should be supported. The
manufacturer/model is Sapphire's X800 GTO Ultimate 256MB. The motherboard is a
RS482-based ATI board.

With "ati" driver (default after ubuntu's gfx detection), X doesn't start at
all. With "radeon" specified, X starts but only with 640x480 resolution whatever
I do.

This bug's aim would probably to have at least 2D working at higher resolutions,
and also have "ati" driver working correctly, ie. delegating the handling of gfx
to "radeon" driver. I can also get some debug output about eg. some variables at
some point in the driver code, if someone would like to know something more
specific. I've only casually looked at the driver code (and X is quite unknown
to me in other ways too), so I would need some specific points to study to
continue myself.

uname -a: Linux test-desktop 2.6.15-21-amd64-generic #1 SMP PREEMPT Fri Apr 21
16:42:20 UTC 2006 x86_64 GNU/Linux

lsmod:
Module                  Size  Used by
rfcomm                 45600  0
l2cap                  30464  5 rfcomm
bluetooth              59268  4 rfcomm,l2cap
radeon                116768  0
drm                    95656  1 radeon
powernow_k8            12992  1
cpufreq_powersave       3328  0
cpufreq_stats           8264  0
cpufreq_userspace       9184  1
cpufreq_ondemand        9768  0
cpufreq_conservative    10984  0
freq_table              6464  2 powernow_k8,cpufreq_stats
tc1100_wmi              9096  0
video                  18824  0
acpi_sbs               24600  0
battery                12296  1 acpi_sbs
i2c_acpi_ec             7040  1 acpi_sbs
container               6272  0
button                  8864  0
pcc_acpi               16128  0
sony_acpi               7060  0
ac                      7176  1 acpi_sbs
dev_acpi               15364  0
hotkey                 13768  0
ext3                  145936  1
jbd                    70952  1 ext3
ipv6                  300416  8
dm_mod                 63176  1
md_mod                 76792  0
af_packet              28172  2
tuner                  46244  0
tvaudio                28316  0
msp3400                36300  0
bttv                  201296  0
video_buf              27012  1 bttv
i2c_algo_bit           11144  1 bttv
v4l2_common             9088  1 bttv
btcx_risc               6792  1 bttv
tveeprom               19344  1 bttv
i2c_core               26624  7
i2c_acpi_ec,tuner,tvaudio,msp3400,bttv,i2c_algo_bit,tveeprom
tsdev                  10240  0
videodev               13696  1 bttv
snd_hda_intel          21664  0
8139too                31744  0
8139cp                 26880  0
snd_hda_codec         170952  1 snd_hda_intel
floppy                 74120  0
mii                     7680  2 8139too,8139cp
snd_pcm_oss            59424  0
snd_mixer_oss          20608  1 snd_pcm_oss
ohci1394               37452  0
ieee1394              369688  1 ohci1394
snd_pcm               104712  3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer              29064  1 snd_pcm
snd                    68576  6
snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore              13216  1 snd
snd_page_alloc         13968  2 snd_hda_intel,snd_pcm
rtc                    16760  0
pcspkr                  3592  0
psmouse                40452  0
serio_raw               9732  0
shpchp                 51360  0
pci_hotplug            33168  1 shpchp
sg                     43568  0
sr_mod                 19748  0
cdrom                  41144  1 sr_mod
evdev                  14464  1
reiserfs              257904  3
ide_generic             2816  0
ehci_hcd               34568  0
ohci_hcd               23684  0
usbcore               145980  3 ehci_hcd,ohci_hcd
atiixp                  8464  1
sd_mod                 21504  6
sata_sil               12292  10
libata                 82328  1 sata_sil
scsi_mod              160248  4 sg,sr_mod,sd_mod,libata
generic                 7300  0
thermal                16524  0
processor              29224  2 powernow_k8,thermal
fan                     6408  0
capability              7176  0
commoncap               9728  1 capability
vga16fb                14864  1
cfbcopyarea             5120  1 vga16fb
vgastate               10368  1 vga16fb
cfbimgblt               4224  1 vga16fb
cfbfillrect             5760  1 vga16fb
fbcon                  43136  72
tileblit                4096  1 fbcon
font                    9984  1 fbcon
bitblit                 7424  1 fbcon
softcursor              3712  1 bitblit