[Intel-gfx] [PATCH] drm/edid: Adding common CVT inferred modes when monitor allows range limited ones trough EDID.

[Takashi Iwai]

At Fri, 13 Apr 2012 15:35:04 +0100,
Dave Airlie wrote:
> 
> > I don't think we need to support all wild modes, too.  But the _very_
> > common modes like 1366x768 and 1600x900 should be really supported as
> > default.
> 
> You guys still haven't answered the basic question, what HW is this broken?

The reported problem is about HP laptops with i915 driver (no matter
chip chip is) and several monitors with resolutions more than the
laptop panel.

The LVDS provides only the native resolution (either 1366x768 or
1600x900) and a few other VESA ones (1024x768, 800x600 and 640x480).
Meanwhile, the monitor EDID doesn't provide such laptop-native
resolutions.
Thus, in clone mode, the only possible resolution is 1024x768 or
lower.  That's the whole problem.  It's too low and doesn't match with
16:9 although both laptop and monitor panels are 16:9.

HP wants the clone mode of the laptop-native resolution and/or a
higher resolution with the right aspect ratio like 1280x720.  Neither
work as of now unless you add the extra mode manually.

> Can you provide some EDIDs?

OK, here we go.  Outputs of "xrandr --verbose" and EDID data from two
monitors.


thanks,

Takashi
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