Public bug reported:

The highest modes aren't detected by xresprobe, but are detected by the
ati driver:

[EMAIL PROTECTED]:~$ sudo xresprobe ati
Password:
id: DELL 2405FPW
res: 1680x1680 1600x1200 1280x1024 1152x864 1024x768 800x600 720x400 640x480
freq: 30-81 56-76
disptype: crt

/var/log/Xorg.0.log snippet:
(II) RADEON(0): I2C bus "DDC" initialized.
(II) RADEON(0): Legacy BIOS detected
(II) RADEON(0): Connector0: DDCType-2, DACType-1, TMDSType-0, ConnectorType-3
(II) RADEON(0): Connector1: DDCType-3, DACType-0, TMDSType--1, ConnectorType-2
(II) RADEON(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) RADEON(0): I2C device "DDC:ddc2" removed.
(II) RADEON(0): DDC Type: 2, Detected Type: 3
(II) RADEON(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) RADEON(0): I2C device "DDC:ddc2" removed.
(II) RADEON(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) RADEON(0): I2C device "DDC:ddc2" removed.
(II) RADEON(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) RADEON(0): I2C device "DDC:ddc2" removed.
(II) RADEON(0): DDC Type: 3, Detected Type: 0
(II) RADEON(0): EDID data from the display on port 1 ----------------------
(II) RADEON(0): Manufacturer: DEL  Model: a010  Serial#: 825512531
(II) RADEON(0): Year: 2006  Week: 4
(II) RADEON(0): EDID Version: 1.3
(II) RADEON(0): Digital Display Input
(II) RADEON(0): Max H-Image Size [cm]: horiz.: 52  vert.: 33
(II) RADEON(0): Gamma: 2.20
(II) RADEON(0): DPMS capabilities: StandBy Suspend Off; RGB/Color Display
(II) RADEON(0): Default color space is primary color space
(II) RADEON(0): First detailed timing is preferred mode
(II) RADEON(0): redX: 0.640 redY: 0.330   greenX: 0.300 greenY: 0.607
(II) RADEON(0): blueX: 0.149 blueY: 0.060   whiteX: 0.312 whiteY: 0.328
(II) RADEON(0): Supported VESA Video Modes:
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): [EMAIL PROTECTED]
(II) RADEON(0): Manufacturer's mask: 0
(II) RADEON(0): Supported Future Video Modes:
(II) RADEON(0): #0: hsize: 1280  vsize 1024  refresh: 60  vid: 32897
(II) RADEON(0): #1: hsize: 1600  vsize 1200  refresh: 60  vid: 16553
(II) RADEON(0): #2: hsize: 1152  vsize 864  refresh: 75  vid: 20337
(II) RADEON(0): #3: hsize: 1680  vsize 1050  refresh: 60  vid: 179
(II) RADEON(0): Supported additional Video Mode:
(II) RADEON(0): clock: 154.0 MHz   Image Size:  519 x 324 mm
(II) RADEON(0): h_active: 1920  h_sync: 1968  h_sync_end 2000 h_blank_end 2080 
h_border: 0
(II) RADEON(0): v_active: 1200  v_sync: 1203  v_sync_end 1209 v_blanking: 1235 
v_border: 0
(II) RADEON(0): Serial No: T613361N14RS
(II) RADEON(0): Monitor name: DELL 2405FPW
(II) RADEON(0): Ranges: V min: 56  V max: 76 Hz, H min: 30  H max: 81 kHz, 
PixClock max 170 MHz
(II) RADEON(0):
(II) RADEON(0): Primary:
 Monitor   -- TMDS
 Connector -- DVI-I
 DAC Type  -- TVDAC/ExtDAC
 TMDS Type -- Internal
 DDC Type  -- DVI_DDC
(II) RADEON(0): Secondary:
 Monitor   -- NONE
 Connector -- VGA
 DAC Type  -- Primary
 TMDS Type -- NONE
 DDC Type  -- VGA_DDC
(II) RADEON(0): PLL parameters: rf=2700 rd=12 min=20000 max=46909632846912; 
xclk=16600
(WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode disabled
(==) RADEON(0): Using gamma correction (1.0, 1.0, 1.0)
(II) RADEON(0): Validating modes on Primary head ---------
(II) RADEON(0): DFP table revision: 4
(II) RADEON(0): Panel infos found from DDC detailed: 1920x1200
(II) RADEON(0): Valid Mode from Detailed timing table: 1920x1200
(II) RADEON(0): Valid Mode from standard timing table: 1280x1024
(II) RADEON(0): Valid Mode from standard timing table: 1600x1200
(II) RADEON(0): Valid Mode from standard timing table: 1152x864
(II) RADEON(0): Valid Mode from standard timing table: 1680x1050
(II) RADEON(0): Valid Mode from established timing table: 1280x1024
(II) RADEON(0): Valid Mode from established timing table: 1024x768
(II) RADEON(0): Valid Mode from established timing table: 1024x768
(II) RADEON(0): Valid Mode from established timing table: 800x600
(II) RADEON(0): Valid Mode from established timing table: 800x600
(II) RADEON(0): Valid Mode from established timing table: 640x480
(II) RADEON(0): Valid Mode from established timing table: 640x480
(II) RADEON(0): Total of 12 mode(s) found.
(II) RADEON(0): Total number of valid DDC mode(s) found: 12

** Affects: xresprobe (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

-- 
xresprobe fails to detect some modes: ati radeon2 se + dell 2405FPW
https://launchpad.net/bugs/59298

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