Perhaps X is rejecting your desired modes, and falling back to the next available standard mode which it likes. Did you check your log in /var/log/Xorg.0.log for lines like "not using mode " pertaining to your mode?
Yes, actually I do have these entries:
(II) NVIDIA(0): Not using mode "1280x720" (no mode of this name)
(II) NVIDIA(0): Not using default mode "1024x768" (width too large for virtual size)
(II) NVIDIA(0): Not using default mode "800x600" (width too large for virtual size)
(WW) NVIDIA(0): Not using mode "720x480":
(WW) NVIDIA(0): horizontal blanking width ((max(858,798) - min(720,736) =
(WW) NVIDIA(0): 138) not a multiple of 8
(WW) NVIDIA(0): horizontal sync width (798 - 736 = 62) not a multiple of 8
(WW) NVIDIA(0): horizontal frame length (858) not a multiple of 8
(**) NVIDIA(0): Validated modes for display device DFP-0:
(**) NVIDIA(0): Default mode "640x480": 25.2 MHz, 31.5 kHz, 60.0 Hz
(**) NVIDIA(0): Default mode "512x384": 32.5 MHz, 48.4 kHz, 60.0 Hz (D)
(**) NVIDIA(0): Default mode "400x300": 20.0 MHz, 37.9 kHz, 60.3 Hz (D)
(**) NVIDIA(0): Default mode "320x240": 12.6 MHz, 31.5 kHz, 60.1 Hz (D)
I'm running this remotely, so I can't actually see it, but xvidtune is telling me it's running at 640x480 right now:
GetModeLine - scrn: 0 clock: 25200
GetModeLine - hdsp: 640 hbeg: 656 hend: 752 httl: 800
vdsp: 480 vbeg: 490 vend: 492 vttl: 525 flags: 10I'm guessing that the sync width not being a multiple of 8 is my main culrpit right now. I'll try tweaking that a bit and get back to the list with my results. Thanks for pointing those entries out. Just knowing where to look in the first place is half the battle!
# Option "TVStandard" "HD720p" Option "TVStandard" "HD1080i" Option "TVOverscan" "0.0"I wasn't aware that TVStandard or TVOverscan worked via Nvidia DVI. I thought that was a tv-out sort of thing only. Do they do anything?
No, they don't do anything. Nor do I have any overscan option when using nvidia-settings. That's just a legacy setting hanging around from my older S-VIDEO configurations. :)
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