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Bug#766049: xserver-xorg-core: Blank primary screen when seocndary attached



Control: severity -1 normal
Control: tag -1 moreinfo

On Mon, Oct 20, 2014 at 23:18:14 +1100, Takis Diakoumis wrote:

> Package: xserver-xorg-core
> Version: 2:1.16.1-1
> Severity: grave
> 
> Dear Maintainer,
> 
> [ issues with reportbug #758619 prevented me from using it completely
> to send this report so I generated using reportbug --template ]
> 
> Since upgrading from 2.:1.16.0.901-1 to the above version I have been
> unable to use a second screen attached to my laptop. During this
> update, I also went from linux-image-amd64 (3.14+59) to 3.16+61 – not
> sure if its relevant.
> 
Actually this seems more likely to be a kernel issue than an X one.

> I have Debian Jessie on a Thinkpad T440s.
> 
> I normally boot with the second monitor attached and it boots fine
> into gdm. Since the update, booting with the monitor attached blanks
> the laptop screen (primary screen) as X starts. The second screen
> works fine as a second screen – as in the primary display is off but
> it behaves as if it is there. The only way out here is to ctrl-alt-f1
> to a terminal and reboot.
> 
Is the screen actually dead, or does it "just" reset the brightness to
minimum?  I.e. do the brightness keys or poking
/sys/class/backlight/*/brightness work?

Cheers,
Julien

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