ThinkPad T420 + kernel 3.8.x + external VGA display == wrong resolution

[Daniel Vetter]

On Mon, Mar 4, 2013 at 10:47 PM, Toralf Förster <toralf.foerster at gmx.de> wrote:
> It is a (small) regression to 3.7.10 with intel integrated graphics i915
> - but nevertheless :
>
> With an external VGA display (1680x1050) and a closed internal LVDS1
> display (1440x900) the external display starts X11 with 1440x900 - for
> kernel 3.7.x.
>
> With 3.8.2 (and .1) now the external display is driven with just 800x600.

Hm, sounds like we fail to properly read the EDID. Can you please boot
both the working and broken kernel with drm.debug=0xe and attach the
complete dmesg?

To keep everything together please file a bug on bugs.freedesktop.org
against DRI -> DRM(Intel) and attach the files there together with
your quick description of the regression above.

Thanks, Daniel
>
>
> --
> MfG/Sincerely
> Toralf Förster
> pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch