[Bug 77137] [PNV] drm/i915: VGA cannot be turned on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77137

--- Comment #7 from Uwe Geuder <bugs-freedesktop-ugeuder at snkmail.com> ---
(In reply to comment #6)
> FWIW I just tried my PNV, a trusty Lenovo s10-3t work horse, err, pony, with
> 3.12 and VGA seemed to work somewhat fine at 1920x1200 @ 60 Hz. Only

Hmmm, I have a S10-3t, too. Did you check from my logs whether we have exactly
the same hardware? (No idea whether this model was delivered in different
configurations.)

Anyway, your report that everything works (well, as far VGA output is
concerned...) made me a bit suspicious whether I could just have broken
hardware.

So I got my hands dirty and booted windows. There are 4 applications to control
display stuff: 2 x Microsoft, Intel, and Lenovo. 1 Microsoft and Intel clearly
read EDID from the external monitor, but none of them succeeds to turn VGA
output on. The other Microsoft and the Lenovo app give little feedback so they
are rather useless for troubleshooting, but they don't succeed to turn on VGA
output either.

Extensively tested with one projector and one cable. Basic tests also with a
monitor and another cable. Both do work with another laptop (Nvidia HW /
nouveau driver). And earlier tests under Linux also made with a 3rd cable and
projector. So if there is a hardware problem, it is in my S10-3t.

Is there anything I can still do to confirm or rule out a HW problem? How
likely is it that EDID works but no signal goes the other direction? (I might
try to have a look with the oscilloscope if somebody can point me to
instructions basic enough to follow for a software guy...)

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