I'm also having this problem on my 14" Lenovo Thinkpad T61p (with Nvidia Quadro 
FX 570M video card, LCD native resolution is 1400x1050), and since it's a 
laptop, I can not get informations like bandwidth/frequencies of the LCD. 
Although I did find something that may be interesting: when running the open 
source mesa driver, I can set the monitor into 1400x1050, 1024x768, 800x600, 
640x480, however the resolution 1280x960 is missing, on the other hand, when I 
use the restricted driver (both 169.12 and 173.14.05 via EnvyNG), both 
1400x1050 and 1280x960 is selectable, but the resolution of 1024x768 and 
800x600 is missing, instead I see some weird resolutions like 800x512 or 
something. 
Anyway, attached here is a bug report log file that I generated using "startx 
-- -logverbose 6" and "nvidia-bug-report.sh" (comes with the restricted Nvidia 
driver ), and part of it reads:
(--) NVIDIA(0): Raw EDID bytes:
(--) NVIDIA(0): 
(--) NVIDIA(0):   00 ff ff ff ff ff ff 00  30 ae 22 40 00 00 00 00
(--) NVIDIA(0):   22 11 01 03 80 1d 15 78  ea 6f 95 9c 54 4c 87 26
(--) NVIDIA(0):   21 50 54 00 00 00 01 01  01 01 01 01 01 01 01 01
(--) NVIDIA(0):   01 01 01 01 01 01 30 2a  78 20 51 1a 10 40 30 70
(--) NVIDIA(0):   13 00 1f d7 10 00 00 18  25 23 78 20 51 1a 10 40
(--) NVIDIA(0):   30 70 13 00 1f d7 10 00  00 18 00 00 00 0f 00 90
(--) NVIDIA(0):   43 32 90 43 28 0f 01 00  30 64 00 55 00 00 00 fe
(--) NVIDIA(0):   00 4c 54 44 31 34 31 45  4e 39 42 0a 20 20 00 f7
(--) NVIDIA(0): 
(--) NVIDIA(0): --- End of EDID for LEN (DFP-0) ---
(--) NVIDIA(0): 
(II) NVIDIA(0): Frequency information for LEN (DFP-0):
(II) NVIDIA(0):   HorizSync   : 53.299-63.981 kHz
(II) NVIDIA(0):   VertRefresh : 50.000-60.000 Hz
(II) NVIDIA(0):     (HorizSync from EDID)
(II) NVIDIA(0):     (VertRefresh from EDID)
I suspect the HorizSync value is wrong, but I don't know much about the EDID 
stuff. The detailed bug log file is attached.

** Attachment added: "nvidia-bug-report.log.gz"
   http://launchpadlibrarian.net/15618006/nvidia-bug-report.log.gz

-- 
EDID fail
https://bugs.launchpad.net/bugs/194760
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