[Intel-gfx] DP1 Monitor Flashes

[Raul Dias]

I will put into a few scenarios:


1 - LVDS1 + DP1

Dell U2713HM using a Display Port cable (display) to a Mini Display Port
(Notebook).
No adapters.

This is where the logs belongs to.

Some random  time after boot (15min, 1hour), the DP1 screen will blank for
a period between 2s to 5s and come back again.
This will keep repeating for 5 to 15 min endless.



2 - LVDS1 + HDMI1

In this case, the U2713M display is using the HDMI port and a HDMI do mini
Display Port adapter.

I can get the 2560x1440 resolution only if I lower the frequence to 41hz or
lower (which I believe is a HDMI limitation).

No problem at all.


3 - LVDS1 + DP1 + VIRTUAL2

Same as (1) with and extra screen on bumblebee: intel-virtual-output -b

This time the U2713M display enters in sleep mode instead of blanking and
does not come back (by itself).
I believe this is the same trigger from (1), but for some reason it is not
just blanking.

To revert this, I have to use xrandr to turn the display off and on
(--auto).


4 - LVDS1 + HDMI1 + VIRTUAL2

Same as (2) with bumblebee.
No problem at all too.


I am not sure if this could be a faulty display or cable if not the driver.
(or how to detect it).


Thanks again.
-rsd





2013/12/11 Jani Nikula <jani.nikula at linux.intel.com>

> On Tue, 10 Dec 2013, Raul Dias <raul at dias.com.br> wrote:
> > Hello,
> >
> > The dmesg for the boot is this:
> > http://pastebin.com/aXJQiprL
>
> I was hoping for the dmesg from the start (which lets me check the
> kernel command line and i915 initialization).
>
> > The dmesg when the flashing started to occur:
> > http://pastebin.com/GkRcpK80
>
> I don't see anything particularly wrong with that. There's the
> occasional dimming of the backlight - that's not what you're referring
> to is it?
>
> Could you describe the problem a bit more please?
>
> BR,
> Jani.
>
>
> > I kept the config a simple as possible.  No bumblebee, just LVDS1 and DP1
> > without adaptors.
> >
> > my Xorg.0.log is this:
> > http://pastebin.com/2vK37TNr
> >
> >
> >
> > Thanks!
> > -rsd
> >
> >
> > 2013/12/10 Jani Nikula <jani.nikula at linux.intel.com>
> >
> >> On Mon, 09 Dec 2013, Raul Dias <raul at 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
> >> > _______________________________________________
> >> > Intel-gfx mailing list
> >> > Intel-gfx at lists.freedesktop.org
> >> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >>
> >> --
> >> Jani Nikula, Intel Open Source Technology Center
> >>
>
> --
> Jani Nikula, Intel Open Source Technology Center
>
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