F16: second monitor is not detected.

Chris Bredesen cbredesen at redhat.com
Thu Nov 17 06:55:16 UTC 2011

On 11/17/2011 10:26 AM, Steven F. LeBrun wrote:
> Recently updated my laptop to Fedora 16. Fedora 16 is not detecting my
> second, external, monitor. The Monitor connects with an HDMI connector
> or a DVI connector through a USB docking station. Connecting it either
> way does not make a difference. What is strange is that during the boot
> process, the system will display the flash screen on the second monitor.
> There was a bug filed about this before Fedora 15 was released. Does
> this bug still exist in Fedora 16? Does anyone know if any work has been
> done on it? The bug deals with the Intel Sandybridge chipset. Note that
> the laptop screen works fine.
>     OS: Fedora 16 x86_64
>     Kernel: 3.1.1-1.fc16.x86_64
>     Desktop: Gnome 3.0.1
>     System: Dell XPS 15R (i5-2410M CPU @ 2.30GHz x 4)
>     Graphics: Intel Sandybridge Mobile
>     Memory: 8 GB
> Bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=40592

Same problem here, no resolution that I have seen.  Plenty of bugs open 
in Fedora complaining of this and related issues:


Love to have some attention on this but I can only guess that not 
everyone is seeing this.  It's the only major usability issue I have 
with Fedora these days but it's a big one.

I work around the issue by using the keyboard shortcut to toggle to the 
mirrored mode and then once the ext display is up, I can turn off LVDS 
and fix the resolution.

In related news, you might find that once this is working, it fails to 
wake up after suspend and you have to do the dance again.


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