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Re: Blank screen bug




On Saturday 23 September 2017 10:49:44 Cindy-Sue Causey wrote:

> On 9/23/17, Roberto C. Sánchez <roberto@xxxxxxxxxx> wrote:
> > On Sat, Sep 23, 2017 at 12:01:31PM +0200, Tim wrote:
> >> Hi,
> >>
> >> I would like to report a bug for Debian stretch, however, I'm not
> >> sure which package I should file the bug against. Moreover, I
> >> haven't found a way to debug the issue either.
> >>
> >> I've recently done a fresh installed of stretch on an HP EliteBook
> >> 840 notebook. Since then, the laptop's screen sometimes turns
> >> blank, i.e., as if there is no input to the screen. Strangely
> >> enough, whenever I attach another display, the other display
> >> doesn't go blank: It's only the internal display of the laptop
> >> itself that turns completely black.
> >>
> >> I've tried to debug the issue by looking a various log files (e.g.,
> >> ~/.local/share/xorg/Xorg.0.log, /var/log/kern.log, running
> >> `journalctl`), but nothing would show up in these logs whenever it
> >> occurs. I also tried to install `firmware-linux-nonfree` but that
> >> didn't help either. Before, I was using jessy without the bug.
> >>
> >> I hope you can tell me which package I should file the bug to, or
> >> how to proceed from here.
> >
> > 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.
> >
> > I am not sure if the problem is that X.org needs to be told which
> > hardware inverts the meaning of the brightness control value, but I
> > suspect that is root cause.
> >
> > I apologize that I don't have any links, but it has been several
> > years since I dealt with this problem.  Perhaps this is enough to
> > get you pointed in the right direction.
>
> Based on both of your posts, I took a quick peek at "apt-listbugs list
> -s all xorg"..
>
> #778573 xorg: Xorg shows blank black screen at startup instead of a
> Display Manager.
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=778573
>
> That references....
>
> #775012 nvidia-driver: startx initializes nvidia driver but kdm does
> not https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775012
>
> May not be exact same thing, especially since they're speaking of boot
> and this thread sounds like it snaps off mid successful usage. But
> maybe you all have come up with something no one thought of or
> possibly even knew was possible.... or not. You never know. :)
>
> Me? Never would have thought about manufacturers reversing how things
> work. That's a very not user friendly twist on proprietary....... :)
>
> A PS is that one poster got fussed at for allegedly hijacking a bug
> report, was told to file their own report. It kind of sounded like the
> "hijacker" was attempting to support, confirm the existence of the bug
> by supplying their own experience so... I guess this is just a heads
> up that this occurred in that arena.
>
> Maybe there was prior history as to why that exchange occurred. One
> last peek at it shows it didn't follow normal list rules, and that
> made it harder to follow the intent. They did sound like they
> encountered the bootup blank screen, did some manipulating, and got
> something to work, although still not quite as expected. :)
>
> Couldn't help it, looked one more allegedly "last time"... The reason
> the comment didn't follow protocol was because it was entered via
> *reportbug*. It wasn't the fault of the alleged "hijacker" that there
> was no previous quote to follow in their post.
>
> The alleged "hijacker" found a bug that matched theirs so they did as
> would be expected per reportbug methodology. They simply addended
> their experience to a bug subject line that matched their
> experience... and then got "blessed" for doing so. I genuinely hate
> when that happens... because that sounds exactly like something I
> would do under the same circumstances. :)
>
> Cindy

Which I've also done, and been yelled at for doing. ReportBug simply 
drops the ball AFAIAC.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>