On Thu, Feb 21, 2019 at 8:00 PM Warren Young <warren@xxxxxxxxxxx> wrote:
> We had a complaint recently from a customer that received a server we
> shipped out that their monitor just showed a black screen. It turns out
> that they’d hooked it up to an ancient POS with 800x600 as its best
> resolution, and gdm in CentOS 7 apparently assumes at least 1024x768. It
> was apparently a major hassle for them to hunt down a reasonable monitor
> for us.
>
>
Hi, I would try the old days way at a lower level..
Create a file 00-monitor.conf under /etc/x11/xorg.conf.d
Something like this below, using conservative range values for horiz and
vert syncs
[root@desktop xorg.conf.d]# cat 00-monitor.conf
Section "Device"
Identifier "Default Video Device"
EndSection
Section "Monitor"
Identifier "Default Monitor"
HorizSync 30.0-62.0
VertRefresh 50.0-70.0
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Default Monitor"
Device "Default Video Device"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "800x600"
EndSubSection
EndSection
[root@desktop xorg.conf.d]#
This way it should be forced to use 800x600 resolution, also because of
conservative values the vesa settings for higher resolutions should be out
of range.
I tried with a CentOS 7 VM in oVirt where by default it gets 1024x768 and
after these settings and reboot, both gdm and graphical sessions got 800x600
In Xorg.0.log I get
[ 15.554] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 15.554] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 15.558] (==) No Layout section. Using the first Screen section.
[ 15.558] (**) |-->Screen "Default Screen" (0)
[ 15.558] (**) | |-->Monitor "Default Monitor"
[ 15.559] (**) | |-->Device "Default Video Device"
[ 15.559] (==) Automatically adding devices
[ 15.559] (==) Automatically enabling devices
[ 15.559] (==) Automatically adding GPU devices
. . .
[ 15.659] (II) qxl(0): Not using mode "1920x1200" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "1920x1080" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "1600x1200" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "1680x1050" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "1400x1050" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "1280x1024" (hsync out of range)
[ 15.659] (II) qxl(0): Not using mode "640x480" (hsync out of range)
[ 15.659] (II) qxl(0): Printing probed modes for output Virtual-0
[ 15.659] (II) qxl(0): Modeline "800x600"x59.9 38.25 800 832 912
1024 600 603 607 624 -hsync +vsync (37.4 kHz UP)
[ 15.659] (II) qxl(0): Modeline "1024x768"x59.9 63.50 1024 1072 1176
1328 768 771 775 798 -hsync +vsync (47.8 kHz P)
. . .
[ 15.659] (--) Depth 24 pixmap format is 32 bpp
[ 15.662] (II) UXA(0): Driver registered support for the following
operations:
[ 15.662] (II) solid
[ 15.662] (II) copy
[ 15.662] (II) composite (RENDER acceleration)
[ 15.662] (II) put_image
[ 15.663] (II) qxl(0): RandR 1.2 enabled, ignore the following RandR
disabled message.
[ 15.664] resizing primary to 1024x768
HIH,
Gianluca
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
https://lists.centos.org/mailman/listinfo/centos
