Re: DP1 Monitor Flashes

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 09 Dec 2013, Raul Dias <raul@dias.com.br> wrote:
> Hello,
>
> I have a Dell L502x which have a optimus Graphic Pack:
>
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
> Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
> controller])
>         Subsystem: Dell Device 050e
>         Flags: bus master, fast devsel, latency 0, IRQ 51
>         Memory at f1400000 (64-bit, non-prefetchable) [size=4M]
>         Memory at e0000000 (64-bit, prefetchable) [size=256M]
>         I/O ports at 4000 [size=64]
>         Expansion ROM at <unassigned> [disabled]
>         Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
>         Capabilities: [d0] Power Management version 2
>         Capabilities: [a4] PCI Advanced Features
>         Kernel driver in use: i915
>
>
> Using driver:
>          2.99.905+git20131023.b70390b4
>
> When I use a DELL U2713HM Monitor on the DisplayPort,  it will flash blank
> for 5 seconds in a 10 minutes interval.
> The monitor is at 2560x1440 (60hz).
>
> This is not ideal, but I can live with.
>
>
> The big problem is when using bumblebee with intel-virtual-output -b.
>
> In this case the monitor will enter in energy save state instead.
>
> The only way back is to turn it off and on with xrandr:
>
>      xrandr --output DP1 --off
>      xrandr --output DP1 --auto
>
> The odd thing is if I use instead a Mini DisplayPort  adapter to a Dual DVI
> output, this problem will not happen.
>
> The downside of this solution is that I will need to add a new mode at 41hz
> with:
>
>      xrandr --newmode "2560x1440_41"    162.00 2560 2608 2640 2720 1440
> 1443 1448 1468 +hsync +vsync
>
>
> So, What I am looking at is the source of the problem:
>
> If the source of the problem is the driver, which debug information should
> I provide?

Please provide dmesg with drm.debug=0xe module parameter from early boot
to the problem. If the problem takes a long time to reproduce, you can
provide two dmesgs, one from early boot and another covering the
problem.

BR,
Jani.


>
> Or is it a problem with the DP of the monitor?
>
> Or a problem with the Display Card?
>
> Or should I lower the frequency in the DisplayPort (as with the DVI)?
>
>
> thanks
> -rsd
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-- 
Jani Nikula, Intel Open Source Technology Center