[Intel-gfx] atom D525 trouble

[Chris Wilson]

On Tue, Apr 28, 2015 at 11:46:59AM +0100, Patrick Welche wrote:
> In ancient pre-KMS times, I was able to get a particular pineview-based
> (Atom D525) desktop computer & monitor to run at decent resolutions.
> Recently, I have tried the 2.99.917 snapshot, and the best I can
> manage is 1024x768.
> 
> Bad parts of the system are:
> - the monitor's EDID is invalid
> - it presents a
>   - low resolution LVDS connected to a DVI socket(!)
>   - a high resolution VGA connector
> 
> It used to be sufficient simply to
> 
> Section "Monitor"
>         Identifier      "VGA"
>         Option "Ignore" "false"
> EndSection
> 
> Section "Monitor"
>         Identifier      "LVDS"
>         Option "Ignore" "true"
> EndSection
> 
> Section "Monitor"
>         Identifier      "LVDS-1"
>         Option "Ignore" "true"
> EndSection
> 
> in xorg.conf.
> 
> 
> How is the connector / resolution meant to be selected (what are the rules)?

If we cannot inherit a config, one is chosen such that a similar pixel
size is presented across all outputs - a "cloned" config.
 
> Any hints on where to look / how to improve the situation?

First try kernel cmdline video=LVDS-1:d to disable the spurious LVDS-DVI
connection (I am sorry it will never work with the current code without
some hacks as we stongly expect a LVDS connection to be a laptop panel).

To fixup the missing EDID, either find a genuine one for your panel (or
fake one) and use drm_kms_helper.edid_firmware=VGA-1:my-edid.bin or
provide sufficent Modelines in either your xorg.conf or through xrandr.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre