It would appear that the results are exactly the same when using Precise:
Code:
[email protected]:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
   1920x1080      60.0*+
   1680x1050      60.0  
   1600x900       60.0  
   1280x1024      60.0  
   1280x800       59.8  
   1280x720       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
DVI-1 disconnected (normal left inverted right x axis y axis)
[email protected]:~$ xrandr --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x55
	Timestamp:  124561
	Subpixel:   horizontal rgb
	Clones:    
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
HDMI-0 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x56
	Timestamp:  124561
	Subpixel:   horizontal rgb
	Clones:    
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
DVI-0 connected 1920x1080+0+0 (0x59) normal (normal left inverted right x axis y axis) 477mm x 268mm
	Identifier: 0x57
	Timestamp:  124561
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID:
		00ffffffffffff0009d1028045540000
		1015010380351e782eb7d5a456549f27
		0c5054210800810081c08180a9c0b300
		d1c001010101023a801871382d40582c
		4500dd0c1100001e000000ff00323442
		3031373030534c300a20000000fd0032
		4c1e5311000a202020202020000000fc
		0042656e5120424c323430300a200058
	load detection: 1 (0x00000001)	range:  (0,1)
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
  1920x1080 (0x59)  148.5MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
  1680x1050 (0x5a)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1600x900 (0x5b)  119.0MHz -HSync +VSync
        h: width  1600 start 1696 end 1864 total 2128 skew    0 clock   55.9KHz
        v: height  900 start  901 end  904 total  932           clock   60.0Hz
  1280x1024 (0x5c)  108.0MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
  1280x800 (0x5d)   83.5MHz +HSync -VSync
        h: width  1280 start 1352 end 1480 total 1680 skew    0 clock   49.7KHz
        v: height  800 start  803 end  809 total  831           clock   59.8Hz
  1280x720 (0x5e)   74.4MHz -HSync +VSync
        h: width  1280 start 1336 end 1472 total 1664 skew    0 clock   44.7KHz
        v: height  720 start  721 end  724 total  746           clock   60.0Hz
  1024x768 (0x5f)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0x60)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  640x480 (0x61)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   60.0Hz
DVI-1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x58
	Timestamp:  124561
	Subpixel:   horizontal rgb
	Clones:    
	CRTCs:      0 1 2 3 4 5
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	load detection: 1 (0x00000001)	range:  (0,1)
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
[email protected]:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 12.04 LTS
Release:	12.04
Codename:	precise
[email protected]:~$ uname -a
Linux ubuntu 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
[email protected]:~$ apt-cache policy xserver-xorg-video-radeon
xserver-xorg-video-radeon:
  Installed: 1:6.14.99~git20111219.aacbd629-0ubuntu2
  Candidate: 1:6.14.99~git20111219.aacbd629-0ubuntu2
  Version table:
 *** 1:6.14.99~git20111219.aacbd629-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status