Card capabilities changed between 87x and 9x

[Roderik]

I've got two similar pc's X2 4600+, Core 2 Duo with 2gb ram and ubuntu edgy. They run a 7600GS and a 6600GT dual DVI nvidia card.

The monitors attached are:
X2: Acer AL2021 (20" 1600x1200) and an Acer AL1721 (17" 1280x1024)
Core2: Acer AL2021 (20" 1600x1200) and a IIyama ProLite E481S (19" 1280x10024)

With the stock edgy drivers (dapper, breezy, idem) i can run in twin view with 1600x1200 + 1280x1024 without any problemes.

I've installed version 96 and as a result my 20" monitors won't go over 1280x1024.

(--) NVIDIA(0): Connected display device(s) on GeForce 6600 at PCI:5:0:0:
(--) NVIDIA(0):     Acer AL2021 (DFP-0)
(--) NVIDIA(0):     Acer AL1721 (DFP-1)
(--) NVIDIA(0): Acer AL2021 (DFP-0): 155.0 MHz maximum pixel clock
(--) NVIDIA(0): Acer AL2021 (DFP-0): Internal Single Link TMDS
(--) NVIDIA(0): Acer AL2021 (DFP-0): Native FlatPanel Scaling is supported
(--) NVIDIA(0): Acer AL2021 (DFP-0): DFP modes are not limited to 60 Hz
(--) NVIDIA(0):     refresh rate
(--) NVIDIA(0):
(--) NVIDIA(0): --- EDID for Acer AL2021 (DFP-0) ---
(--) NVIDIA(0): EDID Version                 : 1.3
(--) NVIDIA(0): Manufacturer                 : ACR
(--) NVIDIA(0): Monitor Name                 : Acer AL2021
(--) NVIDIA(0): Product ID                   : 2021
(--) NVIDIA(0): 32-bit Serial Number         : 210
(--) NVIDIA(0): Serial Number String         :
(--) NVIDIA(0): Manufacture Date             : 2005, week 18
(--) NVIDIA(0): DPMS Capabilities            : Active Off
(--) NVIDIA(0): Prefer first detailed timing : No
(--) NVIDIA(0): Supports GTF                 : No
(--) NVIDIA(0): Maximum Image Size           : 410mm x 310mm
(--) NVIDIA(0): Valid HSync Range            : 26 kHz - 79 kHz
(--) NVIDIA(0): Valid VRefresh Range         : 56 Hz - 75 Hz
(--) NVIDIA(0): EDID maximum pixel clock     : 162.0 MHz
(--) NVIDIA(0):
(--) NVIDIA(0): Established Timings:
(--) NVIDIA(0):   640  x 480  @ 60 Hz
(--) NVIDIA(0):   640  x 480  @ 72 Hz
(--) NVIDIA(0):   640  x 480  @ 75 Hz
(--) NVIDIA(0):   800  x 600  @ 56 Hz
(--) NVIDIA(0):   800  x 600  @ 60 Hz
(--) NVIDIA(0):   800  x 600  @ 72 Hz
(--) NVIDIA(0):   800  x 600  @ 75 Hz
(--) NVIDIA(0):   1024 x 768  @ 60 Hz
(--) NVIDIA(0):   1024 x 768  @ 70 Hz
(--) NVIDIA(0):   1024 x 768  @ 75 Hz
(--) NVIDIA(0):   1280 x 1024 @ 75 Hz
(--) NVIDIA(0):
(--) NVIDIA(0): Standard Timings:
(--) NVIDIA(0):   1280 x 1024 @ 60 Hz
(--) NVIDIA(0):   1600 x 1200 @ 60 Hz
(--) NVIDIA(0):   1152 x 864  @ 75 Hz
(--) NVIDIA(0):   640  x 400  @ 63 Hz
(--) NVIDIA(0):   640  x 400  @ 60 Hz
(--) NVIDIA(0):
(--) NVIDIA(0): --- End of EDID for Acer AL2021 (DFP-0) ---

(--) NVIDIA(0): Acer AL1721 (DFP-1): 155.0 MHz maximum pixel clock
(--) NVIDIA(0): Acer AL1721 (DFP-1): Internal Single Link TMDS
(--) NVIDIA(0): Acer AL1721 (DFP-1): Native FlatPanel Scaling is supported
(--) NVIDIA(0): Acer AL1721 (DFP-1): DFP modes are not limited to 60 Hz
(--) NVIDIA(0):     refresh rate
(--) NVIDIA(0):
(--) NVIDIA(0): --- EDID for Acer AL1721 (DFP-1) ---
(--) NVIDIA(0): EDID Version                 : 1.3
(--) NVIDIA(0): Manufacturer                 : ACR
(--) NVIDIA(0): Monitor Name                 : Acer AL1721
(--) NVIDIA(0): Product ID                   : 44292
(--) NVIDIA(0): 32-bit Serial Number         : 3490087
(--) NVIDIA(0): Serial Number String         : ETL0408012
(--) NVIDIA(0): Manufacture Date             : 2003, week 49
(--) NVIDIA(0): DPMS Capabilities            : Active Off
(--) NVIDIA(0): Prefer first detailed timing : Yes
(--) NVIDIA(0): Supports GTF                 : No
(--) NVIDIA(0): Maximum Image Size           : 340mm x 270mm
(--) NVIDIA(0): Valid HSync Range            : 30 kHz - 83 kHz
(--) NVIDIA(0): Valid VRefresh Range         : 55 Hz - 75 Hz
(--) NVIDIA(0): EDID maximum pixel clock     : 140.0 MHz
(--) NVIDIA(0): Established Timings:
(--) NVIDIA(0):   640  x 480  @ 60 Hz
(--) NVIDIA(0):   640  x 480  @ 75 Hz
(--) NVIDIA(0):   1024 x 768  @ 70 Hz
(--) NVIDIA(0):
(--) NVIDIA(0): Standard Timings:
(--) NVIDIA(0):   1280 x 1024 @ 75 Hz
(--) NVIDIA(0):   1024 x 768  @ 75 Hz
(--) NVIDIA(0):   1024 x 768  @ 60 Hz
(--) NVIDIA(0):   800  x 600  @ 75 Hz
(--) NVIDIA(0):   800  x 600  @ 60 Hz
(--) NVIDIA(0):
(--) NVIDIA(0): Detailed Timings:
(--) NVIDIA(0):   1280 x 1024 @ 60 Hz
(--) NVIDIA(0):     Pixel Clock      : 108.00 MHz
(--) NVIDIA(0):     HRes, HSyncStart : 1280, 1328
(--) NVIDIA(0):     HSyncEnd, HTotal : 1440, 1688
(--) NVIDIA(0):     VRes, VSyncStart : 1024, 1025
(--) NVIDIA(0):     VSyncEnd, VTotal : 1028, 1066
(--) NVIDIA(0):     H/V Polarity     : +/+
(--) NVIDIA(0):

(II) NVIDIA(0):   Validating Mode "1600x1200":
(II) NVIDIA(0):     1600 x 1200 @ 60 Hz
(II) NVIDIA(0):     Mode Source: VESA
(II) NVIDIA(0):       Pixel Clock      : 162.00 MHz
(II) NVIDIA(0):       HRes, HSyncStart : 1600, 1664
(II) NVIDIA(0):       HSyncEnd, HTotal : 1856, 2160
(II) NVIDIA(0):       VRes, VSyncStart : 1200, 1201
(II) NVIDIA(0):       VSyncEnd, VTotal : 1204, 1250
(II) NVIDIA(0):       H/V Polarity     : +/+
(WW) NVIDIA(0):     Mode is rejected: Mode (1600 x 1200) is too large for DFP
(WW) NVIDIA(0):     Native Resolution (Max: 1280 x 1024).

Reverting to the 8x driver gets me my 1600x1200 twin view setup back. So i was wondering why changing drivers has this effect?

[pe1chl]

Originally Posted by Roderik

So i was wondering why changing drivers has this effect?

Because in the new driver, assumptions were added that are not valid.
Like, that the native resolution field of DFP EDID data is always correct, and that nobody would ever want to use a higher resolution than the native resolution.

Both are of course not true. But it will require many reports like yours to convince NVIDIA, it seems.

[netllama]

Please try adding the following to xorg.conf:
Option "ModeValidation" "NoDFPNativeResolutionCheck"

[Roderik]

that fixed it, thx!