The following along with an update to xf86-video-ati-6.14.1 gets me some very 
sexy 1920x1080 on my Radeon HD5450

xrandr(1) hangs (no mouse movement, etc) when running. also, i have some weird 
pixel activity, but it's still sexy

i5.peoples$ xrandr                                                             
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 1920 x 1920
DisplayPort-0 connected 1920x1080+0+0 (normal left inverted right x axis y 
axis) 531mm x 298mm
   1920x1080      60.0*+   60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
   720x400        70.1  
DVI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm 
x 298mm
   1920x1080      60.0 +   60.0* 
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
   720x400        70.1  
DVI-0 disconnected (normal left inverted right x axis y axis)

diffs to pcidevs and drm/radeon_drv.c below, as well as dmesg with the patches. 
the diff is only for the video part. the kernel already picked up an azalia(4)

i5.peoples$ cd /usr/src/sys/dev/pci/
i5.peoples$ cvs diff -u pcidevs drm/radeon_drv.c
Index: drm/radeon_drv.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/radeon_drv.c,v
retrieving revision 1.51
diff -u drm/radeon_drv.c
--- drm/radeon_drv.c    29 Sep 2010 13:32:22 -0000      1.51
+++ drm/radeon_drv.c    3 Apr 2011 12:23:45 -0000
@@ -526,6 +526,8 @@
            CHIP_RS880|RADEON_NEW_MEMMAP|RADEON_IS_IGP},
        {PCI_VENDOR_ATI, PCI_PRODUCT_ATI_RADEON_HD4200_M,
            CHIP_RS880|RADEON_IS_MOBILITY|RADEON_NEW_MEMMAP|RADEON_IS_IGP},
+       {PCI_VENDOR_ATI, PCI_PRODUCT_ATI_RADEON_HD5450,
+           CHIP_RS880|RADEON_NEW_MEMMAP},
         {0, 0, 0}
 };

Index: pcidevs
===================================================================
RCS file: /cvs/src/sys/dev/pci/pcidevs,v
retrieving revision 1.1592
diff -u pcidevs
--- pcidevs     23 Mar 2011 21:55:09 -0000      1.1592
+++ pcidevs     3 Apr 2011 12:23:41 -0000
@@ -1206,6 +1206,7 @@
 product ATI RADEON_HD5700      0x68b8  Radeon HD 5700
 product ATI RADEON_HD5670      0x68d8  Radeon HD 5670
 product ATI MOBILITY_HD5470    0x68e0  Radeon Mobility HD 5470
+product ATI RADEON_HD5450      0x68f9  Radeon HD 5450
 product ATI RS100_PCI          0x700f  RS100 PCI
 product ATI RS200_PCI          0x7010  RS200 PCI
 product ATI RADEON_X1800A      0x7100  Radeon X1800

OpenBSD 4.9-current (GENERIC.MP) #3: Sun Apr  3 03:58:50 EDT 2011
    [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
RTC BIOS diagnostic error 11<memory_size>
real mem = 8445030400 (8053MB)
avail mem = 8206192640 (7826MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.6 @ 0xf0450 (87 entries)
bios0: vendor Dell Inc. version "A07" date 01/21/2011
bios0: Dell Inc. OptiPlex 980
acpi0 at bios0: rev 2
acpi0: sleep states S0 S1 S3 S4 S5
acpi0: tables DSDT FACP SSDT APIC BOOT ASF! MCFG HPET DMAR SLIC SSDT
acpi0: wakeup devices VBTN(S4) PCI0(S5) PCI4(S5) PCI2(S5) PCI3(S5) PCI1(S5) 
PCI5(S5) MOU_(S3) EHC1(S3) EHC2(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i5 CPU 680 @ 3.60GHz, 3591.55 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: apic clock running at 132MHz
cpu1 at mainbus0: apid 4 (application processor)
cpu1: Intel(R) Core(TM) i5 CPU 680 @ 3.60GHz, 3591.00 MHz
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG
cpu1: 256KB 64b/line 8-way L2 cache
cpu2 at mainbus0: apid 1 (application processor)
cpu2: Intel(R) Core(TM) i5 CPU 680 @ 3.60GHz, 3591.00 MHz
cpu2: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG
cpu2: 256KB 64b/line 8-way L2 cache
cpu3 at mainbus0: apid 5 (application processor)
cpu3: Intel(R) Core(TM) i5 CPU 680 @ 3.60GHz, 3591.00 MHz
cpu3: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,S
S,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,AES,NXE,LONG
cpu3: 256KB 64b/line 8-way L2 cache
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 8
acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 4 (PCI4)
acpiprt1 at acpi0: bus 2 (PCI2)
acpiprt2 at acpi0: bus -1 (PCI3)
acpiprt3 at acpi0: bus 1 (PCI1)
acpiprt4 at acpi0: bus 3 (PCI5)
acpiprt5 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C3, C2, C1, PSS
acpicpu1 at acpi0: C3, C2, C1, PSS
acpicpu2 at acpi0: C3, C2, C1, PSS
acpicpu3 at acpi0: C3, C2, C1, PSS
acpibtn0 at acpi0: VBTN
cpu0: Enhanced SpeedStep 3591 MHz: speeds: 3592, 3591, 3458, 3325, 3192, 3059, 
2926, 2793, 2660, 2527, 2394, 226
1, 2128, 1995, 1862, 1729, 1596, 1463, 1330, 1197 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core Host" rev 0x02
ppb0 at pci0 dev 1 function 0 "Intel Core PCIE" rev 0x02: apic 8 int 16 (irq 11)
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "ATI Radeon HD 5450" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
radeondrm0 at vga1: apic 8 int 16 (irq 11)
drm0 at radeondrm0
azalia0 at pci1 dev 0 function 1 "ATI Radeon HD 5470 Audio" rev 0x00: apic 8 
int 17 (irq 5)
azalia0: no supported codecs
azalia0: initialization failure, detaching
"Intel 3400 MEI" rev 0x06 at pci0 dev 22 function 0 not configured
pciide0 at pci0 dev 22 function 2 vendor "Intel", unknown product 0x3b66 rev 
0x06: DMA (unsupported), channel 0 
wired to native-PCI, channel 1 wired to native-PCI
pciide0: using apic 8 int 18 (irq 10) for native-PCI interrupt
pciide0: channel 0 ignored (not responding; disabled or no drives?)
pciide0: channel 1 ignored (not responding; disabled or no drives?)
"Intel 3400 KT" rev 0x06 at pci0 dev 22 function 3 not configured
em0 at pci0 dev 25 function 0 "Intel 82578DM" rev 0x05: apic 8 int 21 (irq 9), 
address 78:2b:cb:7c:e3:cd
ehci0 at pci0 dev 26 function 0 "Intel 3400 USB" rev 0x05: apic 8 int 16 (irq 
11)
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
azalia1 at pci0 dev 27 function 0 "Intel 3400 HD Audio" rev 0x05: apic 8 int 16 
(irq 11)
azalia1: codecs: Realtek ALC269
audio0 at azalia1
ppb1 at pci0 dev 28 function 0 "Intel 3400 PCIE" rev 0x05: apic 8 int 16 (irq 
11)
pci2 at ppb1 bus 2
ppb2 at pci0 dev 28 function 4 "Intel 3400 PCIE" rev 0x05: apic 8 int 16 (irq 
11)
pci3 at ppb2 bus 3
ehci1 at pci0 dev 29 function 0 "Intel 3400 USB" rev 0x05: apic 8 int 23 (irq 5)
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb3 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xa5
pci4 at ppb3 bus 4
pcib0 at pci0 dev 31 function 0 "Intel Q57 LPC" rev 0x05
ahci0 at pci0 dev 31 function 2 "Intel 3400 AHCI" rev 0x05: apic 8 int 18 (irq 
10), AHCI 1.3
ahci0: PHY offline on port 1
scsibus0 at ahci0: 32 targets
sd0 at scsibus0 targ 0 lun 0: <ATA, ST9250410AS, D005> SCSI3 0/direct fixed
sd0: 238475MB, 512 bytes/sec, 488397168 sec total
cd0 at scsibus0 targ 2 lun 0: <HL-DT-ST, DVD+-RW GT32N, A102> ATAPI 5/cdrom 
removable
ichiic0 at pci0 dev 31 function 3 "Intel 3400 SMBus" rev 0x05: apic 8 int 18 
(irq 10)
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-10600
spdmem1 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-10600
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
mtrr: Pentium Pro MTRR support
uhub2 at uhub0 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uhub3 at uhub1 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uhidev0 at uhub3 port 6 configuration 1 interface 0 "Dell Dell QuietKey 
Keyboard" rev 1.10/1.77 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
root on sd0a swap on sd0b dump on sd0b

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