changed xorg.conf FC12 wont start

[Cyb3r]

Hi every one i wanted to change screen resolution manually from xorg.conf and apparently a missed it up and my fedora core stucks and wont start, how can i start fedora in command line (so that i can remove xorg.conf), i tryed ctrl+alt+f1, ctrl+alt+backspace and still cant start in command prompt, i appreciate any help

[David Batson]

Boot to runlevel 3. See "Changing your runlevel at boot time. (aka Grub Method)" on the following webpage.

http://fedorasolved.org/post-install-solutions/runlevel

[Cyb3r]

the earlier problem was solved thanx alot, im now in FC12 ,, but i still cant change resolution to 1024x768 my screen is Acer AL1717 and my Graphic Controller as appeared in my Windows Partition is "Intel(R) 82865G Graphics Controller", how can i edit xorg.conf properly?
it is like this
===============================================
[root@l33t X11]# cat xorg.conf
# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"
# keyboard added by system-config-display
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105+inet"
Option "XkbLayout" "us"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "intel"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "640x480"
EndSubSection
EndSection

[root@l33t X11]#

===============================================

[David Batson]

I think I would try to use xrandr. Here are a couple of links with some tips.

http://forum.mandriva.com/viewtopic.php?t=116643

http://www.thinkwiki.org/wiki/Xorg_RandR_1.2

[MNKyDeth]

If what Batson linked you doesn't fix the issue try changing the modes line to something like this.

Modes "1024x768" "800x600" "640x480"

That should give the option of all three of the resolutions in the GUI.

[Cyb3r]

i checked the links, i followed the tips in the first link and i might have added the new resolution but cant pick it to be used

==============
[root@l33t ~]# gtf 1400 1050 75

# 1400x1050 @ 75.00 Hz (GTF) hsync: 82.20 kHz; pclk: 155.85 MHz
Modeline "1400x1050_75.00" 155.85 1400 1496 1648 1896 1050 1051 1054 1096 -HSync +Vsync

[root@l33t ~]# xrandr --newmode "1400x1050_75.00" 155.85 1400 1496 1648 1896 1050 1051 1054 1096 -HSync +Vsync
[root@l33t ~]# xrandr --size "1400x1050_75.00"
Size 1400x1050 not found in available modes
[root@l33t ~]# xrandr -q
Screen 0: minimum 320 x 200, current 800 x 600, maximum 2048 x 2048
VGA1 connected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
800x600 60.3* 56.2
640x480 59.9
1400x1050_75.00 (0x101) 155.9MHz
h: width 1400 start 1496 end 1648 total 1896 skew 0 clock 82.2KHz
v: height 1050 start 1051 end 1054 total 1096 clock 75.0Hz

==============

[David Batson]

What does xrandr -q give you?

Does monitor-edid -v as root give any useful output?

---------- Post added at 06:53 AM CST ---------- Previous post was at 06:45 AM CST ----------

I think you might need a section such as the following in /etc/X11/xorg.conf with the modes as applicable to your monitor. If you make changes to xorg.conf, you will need to logout/login for changes to take effect.

       SubSection "Display"
           Depth		24
           Modes		"1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
           # ADD A VIRTUAL LINE TO PROVIDE FOR THE LARGEST SCREENS YOU WILL HOTPLUG 
           Virtual              2048 2048 
       EndSubSection

[Cyb3r]

the resolution 1024x768 was working flawlessly in my previous fedora12> installations, below is what xrandr -q and monitor-edid -v give me, BTW MNKyDeth does not add anything to the GUI
===============================================

[root@l33t dripkg]# monitor-edid -v
probing EDID using VBE (port 0)
anonymous map: Permission denied
Retrying with old LRMI interface
mmap: Permission denied
VBE: could not initialize LRMI
probing EDID using VBE (port 1)
anonymous map: Permission denied
Retrying with old LRMI interface
mmap: Permission denied
VBE: could not initialize LRMI
probing EDID using VBE (port 2)
anonymous map: Permission denied
Retrying with old LRMI interface
mmap: Permission denied
VBE: could not initialize LRMI
[root@l33t dripkg]# xrandr -q
Screen 0: minimum 320 x 200, current 800 x 600, maximum 2048 x 2048
VGA1 connected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
800x600 60.3* 56.2
640x480 59.9
1400x1050_75.00 (0x101) 155.9MHz
h: width 1400 start 1496 end 1648 total 1896 skew 0 clock 82.2KHz
v: height 1050 start 1051 end 1054 total 1096 clock 75.0Hz
1400x1050 (0x102) 155.9MHz
h: width 1400 start 1496 end 1648 total 1896 skew 0 clock 82.2KHz
v: height 1050 start 1051 end 1054 total 1096 clock 75.0Hz
[root@l33t dripkg]#
================================================== ============

[David Batson]

Those "Permission denied" messages look suspicious to me, but I don't really know what to expect. I did not get any "Permission denied" messages when I ran monitor-edid -v.

Was the following added to xorg.conf by xrandr?

1400x1050_75.00 (0x101) 155.9MHz
h: width 1400 start 1496 end 1648 total 1896 skew 0 clock 82.2KHz
v: height 1050 start 1051 end 1054 total 1096 clock 75.0Hz
1400x1050 (0x102) 155.9MHz
h: width 1400 start 1496 end 1648 total 1896 skew 0 clock 82.2KHz
v: height 1050 start 1051 end 1054 total 1096 clock 75.0Hz

If so, I would remove those lines then try the following.

Why not try manually adding the 1400x1050 mode as per my previous post in xorg.conf?

[Cyb3r]

the permession denied problem might because DRI is not enabled in my kernel (a thing that denied the installation of Intel Graphic),
i tried adding
==========
SubSection "Display"
Depth 24
Modes "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
# ADD A VIRTUAL LINE TO PROVIDE FOR THE LARGEST SCREENS YOU WILL HOTPLUG
Virtual 2048 2048
EndSubSection
==========
but it caused X to not work properly, and no xrandr did not add to xorg.conf!

---------- Post added at 08:31 AM CST ---------- Previous post was at 06:49 AM CST ----------

Thank you David, i've found the solution in the Hardware section merely adding a line to grub.conf solved it

[David Batson]

If this is an external monitor, Google the make and model of it to get the resolution modes supported. If this is a laptop, then Google that make and model. Also you need to consider your video card in a desktop PC that it also supports the same resolutions that your monitor does (this is not generally an issue in a laptop).

Only put the resolutions supported in the mode line.