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Re: Blank screen bug

On Tue, 2017-10-10 at 14:17 -0500, Nicholas Geovanis wrote:
> On Sat, Sep 23, 2017 at 7:48 AM, Roberto C. Sánchez <roberto@debian.org>
> wrote:
> > I had this exact same problem with Jessie on an HP ProBook 650.  The bug
> > was in X.org and was fixed when I upgraded to Stretch.  The problem, as
> > I recall, was that certain display hardware inverts the sense of the
> > intensity, so that instead of it going from 0 (dark) to max (bright) it
> > goes from 0 (bright) to max (dark).  X.org sets the display brightness
> > to what it thinks is max on the log in screen to compensate for the
> > possibility that was turned all the way down by a previous user.
> >
> > What I found as a "workaround" was that I could log in as normal and
> > then by using the brightness control function keys I could increase the
> > display brightness after logging in.
> >
> Just confirming that apparently I had this same issue with jessie 8.4 on
> Dell hardware.
> The problem only occurred if a second monitor was connected prior to boot.
> Only the
> second monitor's brightness was dialed-up at boot, the primary (laptop)
> screen would
> be dialed down to 0 brightness. Unfortunately the login prompt was on the
> laptop screen.
> Simply dialing-up the brightness was the fix, but it took me a while to
> realize it.

I experience this bug in jessie as well. However, that bug got fixed in
stretch. The bug I'm now facing is random (short) periods of a
black/blank screen. Just as anxiousmac nicely summarized said before:

On Sun, 2017-10-08 at 04:42 -0700, anxiousmac@gmail.com wrote:
> I have exactly the same problem with the same model of laptop ( HP EliteBook 840)
> > From time to time the screen goes blank for 2-6 or so seconds. Pressing random keys may accelerate return, it's hard to say. Certainly those key presses appear to be acted upon in whatever window has the input focus. My BIOS is the most up to date one from the HP website.
> It's irritating but not a show stopper. Would be nice to know how to investigate.

On Sun, 2017-10-08 at 04:05 -0700, Jimmy Johnson wrote:
> Can you see the position of the screens?  Maybe install package "aranr", 
> it's a small GUI to setup the screens.

I will try this, although I'm not exactly sure how this would help as
90% of the time the screen display works fine.

By now I also have a bit more experience with switching to a virtual
console when this occurs, but alas, this doesn't seem to influence the
blank screen in any way.


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