Am i correct (CVT is broken!)

well   over the past few days ive been spending alot of time getting a new display to operate under linux.  the problem with it is this display REQUIRES 1366x768   ive seen other DFPs that have the same requirement or even a more exotic resolutions    and the CVT utility is unable to calculate resolution for 1366x768 and rounded to 1368x768 and it didnt work with the panel     so my solution was to explore the web and i found this website with tons of modelines   so after 2.5 hours of trial and error  i found a modeline that actually worked for this DFP    and it was a 1366x768 resolution  anyways   this raises question to me   about the CVT utility  and if it can create resolutions such as this    and it cannot   it appears that it only generates resolutions that are multiples of eight     therefor there are many resolutions that cannot be generated with it      so im posing the point that the utility may need modification or rewriting     not saying im right   but just posing an theory and idea i have.

Lone_Wolf wrote:CVT is intended to generate modelines for CRT devices
Nope, you're thinking of GTF (general timing formula). CVT (coordinated video timing) is meant for both CRT and DFP displays. However, it's still about analog signals (VGA), not digital ones (DVI). You're right that the correct modeline should come from the display's EDID. By the way, CRTs have an EDID too
@fenntech: Specifying your own modelines shouldn't be necessary, so the solution to your problem isn't hunting down random modelines, it's figuring out why the EDID isn't being read by the system. It is possible that your display doesn't have a valid EDID, but that's rare. Usually the problem is a flaky VGA cable or the nvidia proprietary driver being weird, but you haven't provided any info about your setup so it's impossible to tell where the issue is. The X log contains clues whether the EDID was read correctly.
BTW, sometimes the GPU or the display can only handle VGA resolutions that are multiples of 8, that's why CVT rounds to that. For example, our TV at home can do 1366x768 over digital connections, but 1360x768 over VGA. In contrast, an Asus display I have only has VGA input, but it can handle 1366x768 through it.

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