Intel G41 doesn't see any screens connected after suspend/resume

[Jani Nikula]

On Sun, 16 Mar 2014, Nikolay Martynov <mar.kolya at gmail.com> wrote:
> Hi.
>
>   I've got Ubuntu Saucy on a desktop with Intel G41 chipset (Asus
> P5G41M LE/CSM). It exibits weird behaviour. Kernel: Linux kolya
> 3.11.0-18-generic.
>
>   When I boot system up, login into X session and run xrands I get this:
> Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
> VGA1 disconnected (normal left inverted right x axis y axis)
> HDMI1 connected 1920x1080+0+0 (normal left inverted right x axis y
> axis) 531mm x 299mm
>    1920x1080      60.0*+
>    1280x1024      75.0     60.0
>    1152x864       75.0
>    1024x768       75.1     60.0
>    800x600        75.0     60.3
>    640x480        75.0     60.0
>    720x400        70.1
> DP1 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
>
>   In this state I can switch to a text mode console and it works fine.
>
>   Then I suspend/resume machine and run xrandr again with following result:
> Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
> VGA1 disconnected (normal left inverted right x axis y axis)
> HDMI1 disconnected 1920x1080+0+0 (normal left inverted right x axis y
> axis) 0mm x 0mm
> DP1 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
>   1920x1080 (0x47)  148.5MHz
>         h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
>         v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
>
> Note, that all screens are in disconnected state. Fortunately I still
> see my desktop.
>
>   But unfortunately when I switch to a text console my monitor goes
> into power saving mode and doesn't return from it even if I type on
> keyboard. Also if I leave my X session (i.e. logout) my monitor goes
> into sleep on all virtual terminals and I have to reboot the box.
>
>   I've tried to 'redetect' screens in my X session but it doesn't help
> to fix the issue. Disconnecting/reconnecting screen doesn't help as
> well. Reboot helps.
>
>   Unfortunately I'm do not know details of Linux graphics system to be
> able to properly classify the issue. I would really appreciate some
> guidance here.
>   1) Is this some sort of a known issue with known solution?

Not that I can recall, but that doesn't prove anything...

>   2) Should I file a bug? If so - where and what additional
> information might be useful in that bug.

Please do, on DRM/Intel component at [1]. We'll tend to not forget stuff
so easy if they're filed as bugs. Please attach dmesg from early boot
with drm.debug=0xe module parameter enabled. Please see if running
drm-intel-nightly branch of [2] helps.

Thanks,
Jani.


[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
[2] http://cgit.freedesktop.org/drm-intel/

>
>   I would really appreciate any help and I'll gladly provide any
> additional information that might be required (or test things).
>
> Thanks!
>
> -- 
> Martynov Nikolay.
> Email: mar.kolya at gmail.com
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> dri-devel at lists.freedesktop.org
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-- 
Jani Nikula, Intel Open Source Technology Center