X can't run at full monitor res, but plymouth/rhgb can?

[Sam Varshavchik]

This one is very interesting.

I relocated my LCD monitor whose native resolution is 1920x1080. The video 
card is NV GTX 285, that outputs through a DVI port. The monitor has both a 
DVI and a D-SUB VGA plugs.

With either the standard DVI cable, or a standard VGA cable hooked up 
through a DVI-VGA adapter, everything works fine.

After I relocated the monitor, and attached a 35' long VGA cable via the 
DVI-VGA adapter, the X desktop, and only the X desktop, now comes up with an 
ugly maximum resolution of 1024x768. system-config-display gives me that as 
the max available resolution.

But here's the WTF:

At system boot, plymouth comes up without any issues at 1920x1080, spinning 
the solar theme over the VGA cable. But as soon as plymouth finishes its 
thing, and X takes over, X refuses to go beyond 1024x768. However, if I flip 
to an alternative ALT-VTx, the alternative system console display runs at 
1920x1080. Only X is having a cow here.

I see the following splat in /var/log/messages:

Oct 19 18:19:16 monster kernel: [drm] nouveau 0000:06:00.0: No native mode, forcing panel scaling
Oct 19 18:19:16 monster kernel: [drm] nouveau 0000:06:00.0: 0x125B: parsing clock script 0
Oct 19 18:19:22 monster kernel: [drm] nouveau 0000:06:00.0: No native mode, forcing panel scaling
Oct 19 18:19:22 monster kernel: i2c i2c-1: sendbytes: NAK bailout.
Oct 19 18:19:22 monster kernel: [drm] nouveau 0000:06:00.0: 0x125B: parsing clock script 0
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 254
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* Raw EDID:
Oct 19 18:19:22 monster kernel:
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 150
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* Raw EDID:
Oct 19 18:19:22 monster kernel:
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 186
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* Raw EDID:
Oct 19 18:19:22 monster kernel:
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 103
Oct 19 18:19:22 monster kernel: [drm:drm_edid_block_valid] *ERROR* Raw EDID:
Oct 19 18:19:22 monster kernel:
Oct 19 18:19:22 monster kernel: nouveau 0000:06:00.0: DVI-I-1: EDID block 0 invalid.
Oct 19 18:19:22 monster kernel: [drm] nouveau 0000:06:00.0: DDC responded, but no EDID for DVI-I-1

Obviously X has issues poking the monitor, however since both rhgb and the 
system console terminals are just peachy coming up at 1920x1080, I don't see 
why X should be having a cow, here.

I tried mucking around with xorg.conf (and experience flashbacks to the good 
ol' days). The results were …an "obvious" dead end.

I do have an extra-long DVI cable on order, hopefully this'll fix it. May 
be, may be not.

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