[Bug 74381] ASUS T100TA panel video cannot be reenabled after it is disabled

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=74381

--- Comment #4 from Adam Williamson <awilliam at redhat.com> ---
I think the fact that X fails to start correctly if I boot with Fedora
'graphical boot' enabled is the same bug as this, and it's also the same bug
that if I try to manipulate the screen with xrandr at all, the display dies.

When booting with 'graphical boot' (rhgb parameter) - both in broken (3.15) and
working (3.14) cases - there's this extra bit in the logs during X startup:

Apr 24 14:49:31 fedlet.happyassassin.net gdm-Xorg-:0[875]: (II) intel(0):
resizing framebuffer to 800x1280
Apr 24 14:49:31 fedlet.happyassassin.net gdm-Xorg-:0[875]: (II) intel(0):
switch to mode 800x1280 at 60.0 on pipe 0 using VGA1, position (0, 0), rotation
normal

presumably the framebuffer is set to something else during graphical boot
(which would explain why the graphical boot sequence is always corrupted), and
X realizes it has to reset it. When booting without rhgb, this doesn't happen.
The second operation there looks like an RandR operation.

So it looks like both waking from blank (or blanking itself, hard to tell
which) and any kind of RandR mode change operation make the display stop
working (go black).

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