[Intel-gfx] DP1 Monitor Flashes

[Raul Dias]

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?

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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