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.
> 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.
> 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.
> 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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