Hello,
> -----Ursprüngliche Nachricht-----
> Von: xorg [mailto:xorg-boun...@lists.x.org] Im Auftrag von Felix Miata
> Gesendet: Mittwoch, 13. Dezember 2017 11:31
> An: xorg@lists.x.org
> Betreff: Re: monitor hotplug resolution switch
>
> Johann Obermayr composed on 2017-12-13 08:36 (UTC:
>
> >> Johann Obermayr composed:
>
> >>> i have a x86 machine with i915 graphics.
>
> >>> With connected display (1920x1080) all is ok.
>
> >>> But if I disconnect the monitor, the resolution switch to 320x200.
>
> >>> How can I disable this ?
>
> >>> I will always have the same resolution (1920x1080)
>
> >>> How can I do this ?
>
> >> some more info is certainly necessary
>
> >> what OS?
> >> what remaining monitor?
>
> >> what do xrandr say?
>
> > yes, sorry.
> > X86 dualcore Intel(R) Celeron(R) CPU G1820 @ 2.70GHz With On board
> > graphics i915
>
> 'inxi -c0 -G' and/or 'lspci -nnk | grep -A4 VGA' would tell a bit more.
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell Integrated
Graphics Controller [8086:0402] (rev 06)
Subsystem: Intel Corporation Haswell Integrated Graphics Controller
[8086:0402]
Kernel driver in use: i915
>
> > Older Yocto build with Kernel 3.10.0
>
> That kernel version is older than your G1820 CPU.
>
> > X.Org X Server 1.14.0
> > Release Date: 2013-03-05
> > [1274713.521] X Protocol Version 11, Revision 0 [1274713.521] Build
> > Operating System: Linux 3.2.0-126-generic-pae i686 [1274713.521]
> > Current Operating System: Linux sigmatek-x86-mp 3.10.0 #48 SMP
> PREEMPT Wed Dec 6 18:30:54 CET 2017 i686
> > [1274713.521] Current version of pixman: 0.29.2
>
> Why did you omit the "Kernel command line:" line? What's on it might
> explain why falling back to 320x200, if the age of your hardware being newer
> than your software does not.
>
> > And using xf86-video-intel-2.21.3.tar.bz2
>
> That predates the release of your G1820 (Haswell) CPU by nearly a year.
Now i have compile version 2.99.917
This support virtual outputs. (with sna enabled)
Now I will make some test with this virtual outputs.
>
> > xorg.conf
> ...
> > Section "Screen"
> > Identifier "Screen0"
> > Monitor "Monitor0"
> > DefaultDepth 16
> > SubSection "Display"
> > Viewport 0 0
> > Depth 16
> > EndSubSection
> > EndSection
>
> > Yes we use 16 bit color depth.
>
> That's not as well tested as the higher depths, and may cause inexplicable
> trouble.
I think intel will wrap this.
Because if I ask framebuffer, it tell me that he has 32bit color.
But only x-server will work with 16 bit.
>
> > root@sigmatek-x86-mp:~# xrandr
> > Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
> > VGA1 disconnected
> > DP1 disconnected
> > HDMI1 disconnected
> > DP2 disconnected
> > HDMI2 disconnected
> > DP3 connected
> > 1920x1080 60.0 +
> > HDMI3 disconnected
>
> > But after disconnect the monitor, the driver will change resolution to
> 320x200.
> > But we will, that driver does not change the resolution. Or we can define
> the default resolution.
>
> Section "Monitor"
> ...
> Option "PreferredMode" "1920x1080"
> ...
> EndSection
>
> PreferredMode option should define resolution preferred, if the hardware is
> supported.
> --
> "Wisdom is supreme; therefore get wisdom. Whatever else you get, get
> wisdom." Proverbs 4:7 (New Living Translation)
>
> Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
>
> Felix Miata *** http://fm.no-ip.com/
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