[SOLVED] Cannot change screen resolution on unknown display in Centos7
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Cannot change screen resolution on unknown display in Centos7
I am running a fresh version of CentOS Linux release 7.2.1511 on an HP 640 G2 laptop and the screen resolution settings are defaulting to "Unknown Display" at 1024x768 (4:3). I know that the screen is actually 1920x1080.
When I run xrandr to try and change the modes available, i receive:
Code:
$xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
1024x768 76.00*
Take a look into /var/log/Xorg.0.log (or _whereever_ that is now with systemd...). In there you can see with the (W) or (E) where the xorg system found warnings or errors. I guess your graphics hardware isn't detected properly or a driver is missing.
Take a look into /var/log/Xorg.0.log (or _whereever_ that is now with systemd...). In there you can see with the (W) or (E) where the xorg system found warnings or errors. I guess your graphics hardware isn't detected properly or a driver is missing.
Thanks for letting me know to look for WW and EE, otherwise it's a hard file to navigate! There were a couple of errors and warnings, but it is focussed around one area. It looks like you may be right that a driver is missing, after looking at the following snippet of /var/log/Xorg.0.log
Code:
[ 16.254] (II) VESA: driver for VESA chipsets: vesa
[ 16.254] (++) using VT number 1
[ 16.262] (EE) open /dev/dri/card0: No such file or directory
[ 16.262] (WW) Falling back to old probe method for modesetting
[ 16.262] (EE) open /dev/dri/card0: No such file or directory
[ 16.262] (II) Loading sub module "fbdevhw"
[ 16.262] (II) LoadModule: "fbdevhw"
[ 16.263] (II) Loading /usr/lib64/xorg/modules/libfbdevhw.so
[ 16.263] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 16.263] compiled for 1.17.2, module version = 0.0.2
[ 16.263] ABI class: X.Org Video Driver, version 19.0
[ 16.263] (**) FBDEV(1): claimed PCI slot 0@0:2:0
[ 16.263] (II) FBDEV(1): using default device
[ 16.263] (WW) Falling back to old probe method for vesa
[ 16.263] (EE) Screen 0 deleted because of no matching config section.
What graphics card do you have? How can we tell what driver to use if you do not let us know what card you have. I expected you to put the entire log into a pastebin site using pastebinit utility (or similar).
What graphics card do you have? How can we tell what driver to use if you do not let us know what card you have. I expected you to put the entire log into a pastebin site using pastebinit utility (or similar).
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