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Re: Blank screen bug

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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.

-Roberto
>
> --
> Roberto C. Sánchez
>
>

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Thread

Blank screen bug Tim <debian-bugreport@quuck.eu> - 2017-09-23 12:30 +0200
  Re: Blank screen bug Richard Owlett <rowlett@cloud85.net> - 2017-09-23 13:00 +0200
  Re: Blank screen bug Roberto C. Sánchez <roberto@debian.org> - 2017-09-23 14:50 +0200
    Re: Blank screen bug Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-09-23 17:00 +0200
      Re: Blank screen bug Gene Heskett <gheskett@shentel.net> - 2017-09-23 17:10 +0200
      Re: Blank screen bug David Wright <deblis@lionunicorn.co.uk> - 2017-09-24 04:00 +0200
    Re: Blank screen bug Tim <debian-bugreport@quuck.eu> - 2017-10-13 00:50 +0200
    Re: Blank screen bug Nicholas Geovanis <nickgeovanis@gmail.com> - 2017-10-13 01:10 +0200
  Re: Blank screen bug David Wright <deblis@lionunicorn.co.uk> - 2017-09-24 03:30 +0200
    Re: Blank screen bug Tim <debian-bugreport@quuck.eu> - 2017-10-08 12:10 +0200
      Re: Blank screen bug Jimmy Johnson <field.engineer@gmail.com> - 2017-10-08 13:10 +0200
      Re: Blank screen bug anxiousmac@gmail.com - 2017-10-08 14:10 +0200
      Re: Blank screen bug David Wright <deblis@lionunicorn.co.uk> - 2017-10-13 00:10 +0200
  Re: Blank screen bug Jimmy Johnson <field.engineer@gmail.com> - 2017-09-24 07:20 +0200

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