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I am trynig to install Red Hat Linux 7.2. Everything goes fine, installation completes without any problem. Then in GRUB menu, I choose linux, everything loads up in command shell ...
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    Video Problem


    I am trynig to install Red Hat Linux 7.2. Everything goes fine, installation completes without any problem. Then in GRUB menu, I choose linux, everything loads up in command shell without any prob. But when it loads, after that there are no signals for my monitor, it just turns off. I am using LG StudioWorks 520si monitor. I would be grateful if someone can help.

  2. #2
    Linux Guru techieMoe's Avatar
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    I don't mean to sidestep your question, but is there a particular reason you're using Redhat 7.2? It's quite old. The last release Redhat made was 9.0, then Fedora picked it up and has since made 2 more releases: Fedora Core 1 and 2, with 3 on the way.

    Back to your question, when you say "when it loads" do you mean with X Windows tries to start up? If your monitor is turning off in that case it may be a problem with your refresh/sync rates. X Windows could be trying to display at a resolution/refresh rate/sync value that is incompatible with your monitor.
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    I am using 7.2 due to a certain techinical reason, sorry
    Well coming to point, yes the problem comes when XWindowsSsytem starts, I have tried to search for specificatiosn of my monitor, but i can't find it, can you guide me to a place where I can look for it?
    Thanks anyway for your time.

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    Linux Guru techieMoe's Avatar
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    Quote Originally Posted by kamran_pro
    I am using 7.2 due to a certain techinical reason, sorry
    Just checking. Wouldn't want you to be using an older version without knowledge that there was a newer one out there.

    Well coming to point, yes the problem comes when XWindowsSsytem starts, I have tried to search for specificatiosn of my monitor, but i can't find it, can you guide me to a place where I can look for it?
    Thanks anyway for your time.
    Is there any way for you to access the system files? The first thing I would do is keep X Windows from starting by default by editing your /etc/inittab. There is a section in there that says:

    Code:
    # 
    # Default runlevel.
    id:5:initdefault:
    Runlevel 5 boots into X Windows. To boot to a console (thus making your system easier to configure) change the 5 to a 3. This will boot you to a non-graphical console. Now, since you're having trouble booting into the system to begin with, getting to that file may prove difficult. I would recommend a LiveCD like Knoppix, which allows you to boot from the CD and edit that file without actually booting into the system on your harddrive.

    On the topic of your monitor sync ranges and refresh rates... I usually run the xf86config --textmode command and when it asks me to specify the refresh rate/sync range I just try one of the preset options and see what happens.. I wish I could say there's a more scientific way to do it, but I haven't found one yet. Do you have the manual for your monitor? Sync ranges and refresh rates are usually in there somewhere.
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    Thanks for your help, but from where and how can I change my run level to 3. As I am a total novie for linux i need a little more help.

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    Linux Guru techieMoe's Avatar
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    As I've said above, there's a file on your system called inittab that can be found in your /etc/ directory. To change it you'll need some way to access the file without booting into your system. See my above post.

    You can edit text files with just about any program, but to edit this particular file you'll need to be logged in as root (open a console, type su then your Administrator (root) password). Some common text editors are pico, nano, joe, jpico, emacs, and vi. I don't recommend the last two for a newbie; their learning curve is kind of steep, particularly vi.
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    I have installed linux again from scratch and provided accurate sync values in XConfiguration. I am able to login as root in text mode, but when I type xstart to start XWindow System, it gives many errors like "no screen found". Do I need to install driver of my monitor? if yes, then how do I install drivers through text-mode.
    Thanks again for your support.

  8. #8
    Linux Guru techieMoe's Avatar
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    "No screens found" means that your XFree86 (or Xorg) wasn't configured correctly. Post the contents of your /etc/X11/xorg.conf here. In particular, the section that starts with "Display".
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    Thanks, I am posting the file you specified here as soon as I manage to get it on Windows . In the meanwhile, please help me about a weirder problem, after I installed linux, whenever I shutdown Windows XP, the Windows is shutting down screen cotinues to display for infinite time, and CPU is turned off. The only way I got is to turn main power off. But any reason for this pecular behaviour?

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    I dont have xorg.cnf file in X11 directory but I have found this XF86config file. Maybe it would help you diagnose the problem.
    Code:
    # File generated by anaconda.
    # **********************************************************************
    # Refer to the XF86Config(4/5) man page for details about the format of 
    # this file.
    # **********************************************************************
    
    # **********************************************************************
    # Files section.  This allows default font and rgb paths to be set
    # **********************************************************************
    
    Section "Files"
    
    # The location of the RGB database.  Note, this is the name of the
    # file minus the extension (like ".txt" or ".db").  There is normally
    # no need to change the default.
    
        RgbPath	"/usr/X11R6/lib/X11/rgb"
    
    # Multiple FontPath entries are allowed (they are concatenated together)
    # By default, Red Hat 6.0 and later now use a font server independent of
    # the X server to render fonts.
    
        FontPath   "unix/:7100"
    
    EndSection
    
    # **********************************************************************
    # Server flags section.
    # **********************************************************************
    
    Section "ServerFlags"
        # Uncomment this to cause a core dump at the spot where a signal is 
        # received.  This may leave the console in an unusable state, but may
        # provide a better stack trace in the core dump to aid in debugging
    
        # NoTrapSignals
    
        # Uncomment this to disable the <Crtl><Alt><BS> server abort sequence
        # This allows clients to receive this key event.
    
        # DontZap
    
        # Uncomment this to disable the <Crtl><Alt><KP_+>/<KP_-> mode switching
        # sequences.  This allows clients to receive these key events.
    
        # DontZoom
    EndSection
    
    # Pointer section
    # **********************************************************************
    
    Section "Pointer"
        Protocol    "PS/2"
        Device      "/dev/psaux"
    
    #    For wheel support - can not be used with Emulate3Buttons
    #
    #    ZAxisMapping 4 5
    
    # When using XQUEUE, comment out the above two lines, and uncomment
    # the following line.
    #    Protocol	"Xqueue"
    
    # Baudrate and SampleRate are only for some Logitech mice
    #    BaudRate	9600
    #    SampleRate	150
    
    # Emulate3Buttons is an option for 2-button Microsoft mice
    # Emulate3Timeout is the timeout in milliseconds &#40;default is 50ms&#41;
    #   Emulate3Buttons
        Emulate3Timeout    50
    
    # ChordMiddle is an option for some 3-button Logitech mice
    #    ChordMiddle
    
    EndSection
    
    # **********************************************************************
    # Keyboard section
    # **********************************************************************
    
    Section "Keyboard"
        Protocol    "Standard"
    
        AutoRepeat	500 5
    
    # when using XQUEUE, comment out the above line, and uncomment the
    # following line
        # Protocol   "Xqueue"
    
    # Let the server do the NumLock processing.  This should only be 
    # required when using pre-R6 clients
        # ServerNumLock
    
    # Specify which keyboard LEDs can be user-controlled &#40;eg, with xset&#40;1&#41;&#41;
        # Xleds      1 2 3
    
    # To set the LeftAlt to Meta, RightAlt key to ModeShift, 
    # RightCtl key to Compose, and ScrollLock key to ModeLock&#58;
    
        LeftAlt         Meta
        RightAlt        Meta
        ScrollLock      Compose
        RightCtl        Control
    
    # To disable the XKEYBOARD extension, uncomment XkbDisable.
    #    XkbDisable
    
    # To customise the XKB settings to suit your keyboard, modify the
    # lines below &#40;which are the defaults&#41;.  For example, for a non-U.S.
    # keyboard, you will probably want to use&#58;
    #    XkbModel    "pc102"
    # If you have a US Microsoft Natural keyboard, you can use&#58;
    #    XkbModel    "microsoft"
    #
    # Then to change the language, change the Layout setting.
    # For example, a german layout can be obtained with&#58;
    #    XkbLayout   "de"
    # or&#58;
    #    XkbLayout   "de"
    #    XkbVariant  "nodeadkeys"
    #
    # If you'd like to switch the positions of your capslock and
    # control keys, use&#58;
    #    XkbOptions  "ctrl&#58;swapcaps"
    #
    # If you'd like to disable the capslock key, use&#58;
    #    XkbOptions  "ctrl&#58;nocaps"
    
    
         XkbRules    "xfree86"
         XkbModel    "pc105"
         XkbLayout   "us"     
         XkbVariant  "basic"
         #XkbOptions  ""
    EndSection
    
    # **********************************************************************
    # Monitor section
    # **********************************************************************
    
    # Any number of monitor sections may be present
    Section "Monitor"
        Identifier  "Generic Monitor"
        VendorName  "Unknown"
        ModelName   "Unknown"
    #    HorizSync   31.5
    #    VertRefresh 60
        HorizSync   35.15
        VertRefresh 55-65
    
    #    ModeLine  "640x480"   25.175  640 664 760 800
    #                                  480 491 493 525
    
    # 800x600 @ 56 Hz, 35.15 kHz hsync
        ModeLine "800x600"     36     800  824  896 1024
                                      600  601  603  625
    
    EndSection
    
    
    
    Section "Monitor"
        Identifier  "GSM3ad7"
        VendorName  "Unknown"
        ModelName   "Unknown"
    
    # HorizSync is in kHz unless units are specified.
    # HorizSync may be a comma separated list of discrete values, or a
    # comma separated list of ranges of values.
    # NOTE&#58; THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
    # USER MANUAL FOR THE CORRECT NUMBERS.
    
        HorizSync   54
    
    # VertRefresh is in Hz unless units are specified.
    # VertRefresh may be a comma separated list of discrete values, or a
    # comma separated list of ranges of values.
    # NOTE&#58; THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
    # USER MANUAL FOR THE CORRECT NUMBERS.
    
        VertRefresh 90
    
    # Modes can be specified in two formats.  A compact one-line format, or
    # a multi-line format.
    
    # These two are equivalent
    
    #    ModeLine "1024x768i" 45 1024 1048 1208 1264 768 776 784 817 Interlace
    
    #    Mode "1024x768i"
    #        DotClock	45
    #        HTimings	1024 1048 1208 1264
    #        VTimings	768 776 784 817
    #        Flags		"Interlace"
    #    EndMode
    
    # This is a set of standard mode timings. Modes that are out of monitor spec
    # are automatically deleted by the server &#40;provided the HorizSync and
    # VertRefresh lines are correct&#41;, so there's no immediate need to
    # delete mode timings &#40;unless particular mode timings don't work on your
    # monitor&#41;. With these modes, the best standard mode that your monitor
    # and video card can support for a given resolution is automatically
    # used.
    
    # Low-res Doublescan modes
    # If your chipset does not support doublescan, you get a 'squashed'
    # resolution like 320x400.
    
    # --320x200--
    # 320x200 @ 70 Hz, 31.5 kHz hsync, 8&#58;5 aspect ratio
        Modeline "320x200"     12.588 320  336  384  400
                                      200  204  205  225 Doublescan
    # 320x240 @ 60 Hz, 31.5 kHz hsync, 4&#58;3 aspect ratio
        Modeline "320x240"     12.588 320  336  384  400
                                      240  245  246  262 Doublescan
    # 320x240 @ 72 Hz, 36.5 kHz hsync
        Modeline "320x240"     15.750 320  336  384  400
                                      240  244  246  262 Doublescan
    # --400x300--
    # 400x300 @ 56 Hz, 35.2 kHz hsync, 4&#58;3 aspect ratio
        ModeLine "400x300"     18     400  416  448  512
                                      300  301  302  312 Doublescan
    # 400x300 @ 60 Hz, 37.8 kHz hsync
        Modeline "400x300"     20     400  416  480  528
                                      300  301  303  314 Doublescan
    # 400x300 @ 72 Hz, 48.0 kHz hsync
        Modeline "400x300"     25     400  424  488  520
                                      300  319  322  333 Doublescan
    # 480x300 @ 56 Hz, 35.2 kHz hsync, 8&#58;5 aspect ratio
        ModeLine "480x300"     21.656 480  496  536  616
                                      300  301  302  312 Doublescan
    # 480x300 @ 60 Hz, 37.8 kHz hsync
        Modeline "480x300"     23.890 480  496  576  632
                                      300  301  303  314 Doublescan
    # 480x300 @ 63 Hz, 39.6 kHz hsync
        Modeline "480x300"     25     480  496  576  632
                                      300  301  303  314 Doublescan
    # 480x300 @ 72 Hz, 48.0 kHz hsync
        Modeline "480x300"     29.952 480  504  584  624
                                      300  319  322  333 Doublescan
    
    # Normal video modes
    
    # -- 512x384
    # 512x384 @ 78 Hz, 31.50 kHz hsync
        Modeline "512x384"    20.160 512  528  592  640
                                     384  385  388  404 -HSync -VSync
    # 512x384 @ 85 Hz, 34.38 kHz hsync
        Modeline "512x384"    22     512  528  592  640
                                     384  385  388  404 -HSync -VSync
    
    # -- 640x400 --
    # 640x400 @ 70 Hz, 31.5 kHz hsync
        Modeline "640x400"     25.175 640  664  760  800
                                      400  409  411  450
    # 640x400 @ 85 Hz, 37.86 kHz hsync
        Modeline "640x400"     31.5   640  672 736   832
                                      400  401  404  445 -HSync +VSync
    
    # --- 640x480 ---
    # 640x480 @ 60 Hz, 31.5 kHz hsync
        Modeline "640x480"     25.175 640  664  760  800
                                      480  491  493  525
    # 640x480 @ 72 Hz, 36.5 kHz hsync
        Modeline "640x480"     31.5   640  680  720  864
                                      480  488  491  521
    # 640x480 @ 75 Hz, 37.50 kHz hsync
        ModeLine  "640x480"    31.5   640  656  720  840
                                      480  481  484  500 -HSync -VSync
    # 640x480 @ 85 Hz, 43.27 kHz hsync
        Modeline "640x480"     36     640  696  752  832
                                      480  481  484  509 -HSync -VSync
    # 640x480 @ 100 Hz, 53.01 kHz hsync
        Modeline "640x480"     45.8   640  672  768  864
                                      480  488  494  530 -HSync -VSync
    
    # --- 800x600 ---
    # 800x600 @ 56 Hz, 35.15 kHz hsync
        ModeLine "800x600"     36     800  824  896 1024
                                      600  601  603  625
    # 800x600 @ 60 Hz, 37.8 kHz hsync
        Modeline "800x600"     40     800  840  968 1056
                                      600  601  605  628 +hsync +vsync
    # 800x600 @ 72 Hz, 48.0 kHz hsync
        Modeline "800x600"     50     800  856  976 1040
                                      600  637  643  666 +hsync +vsync
    # 800x600 @ 85 Hz, 55.84 kHz hsync
        Modeline  "800x600"    60.75  800  864  928 1088
                                      600  616  621  657 -HSync -VSync
    # 800x600 @ 100 Hz, 64.02 kHz hsync
        Modeline  "800x600"    69.65  800  864  928 1088
                                      600  604  610  640 -HSync -VSync
    
    # --- 1024x768 ---
    # 1024x768 @ 60 Hz, 48.4 kHz hsync
        Modeline "1024x768"    65    1024 1032 1176 1344
                                     768  771  777  806 -hsync -vsync
    # 1024x768 @ 70 Hz, 56.5 kHz hsync
        Modeline "1024x768"    75    1024 1048 1184 1328
                                     768  771  777  806 -hsync -vsync
    # 1024x768 @ 76 Hz, 62.5 kHz hsync
        Modeline "1024x768"    85    1024 1032 1152 1360
                                     768  784  787  823
    # 1024x768 @ 85 Hz, 70.24 kHz hsync
        Modeline "1024x768"   98.9  1024 1056 1216 1408
                                    768 782 788 822 -HSync -VSync
    # 1024x768 @ 100Hz, 80.21 kHz hsync
        Modeline "1024x768"   115.5  1024 1056 1248 1440
                                     768  771  781  802 -HSync -VSync
    
    # --- 1152x864 ---
    # 1152x864 @ 60 Hz, 53.5 kHz hsync
        Modeline  "1152x864"   89.9  1152 1216 1472 1680
                                     864  868  876  892 -HSync -VSync
    # 1152x864 @ 70 Hz, 62.4 kHz hsync
        Modeline  "1152x864"   92    1152 1208 1368 1474
                                     864  865  875  895
    # 1152x864 @ 78 Hz, 70.8 kHz hsync
        Modeline "1152x864"   110   1152 1240 1324 1552
                                    864  864  876  908
    # 1152x864 @ 84 Hz, 76.0 kHz hsync
        Modeline "1152x864"   135    1152 1464 1592 1776
                                     864  864  876  908
    # 1152x864 @ 100 Hz, 89.62 kHz hsync
        Modeline "1152x864"   137.65 1152 1184 1312 1536
                                     864  866  885  902 -HSync -VSync
    
    # -- 1280x1024 --
    # 1280x1024 @ 61 Hz, 64.2 kHz hsync
        Modeline "1280x1024"  110    1280 1328 1512 1712
                                     1024 1025 1028 1054
    # 1280x1024 @ 70 Hz, 74.59 kHz hsync
        Modeline "1280x1024"  126.5 1280 1312 1472 1696
                                    1024 1032 1040 1068 -HSync -VSync
    # 1280x1024 @ 74 Hz, 78.85 kHz hsync
        Modeline "1280x1024"  135    1280 1312 1456 1712
                                     1024 1027 1030 1064
    # 1280x1024 @ 76 Hz, 81.13 kHz hsync
        Modeline "1280x1024"  135    1280 1312 1416 1664
                                     1024 1027 1030 1064
    # 1280x1024 @ 85 Hz, 91.15 kHz hsync
        Modeline "1280x1024"  157.5  1280 1344 1504 1728
                                     1024 1025 1028 1072 +HSync +VSync
    # 1280x1024 @ 100 Hz, 107.16 kHz hsync
        Modeline "1280x1024"  181.75 1280 1312 1440 1696
                                     1024 1031 1046 1072 -HSync -VSync
    
    # -- 1400x1050 --
    # 1400x1050 @ 60Hz, 65.8 kHz hsync
        Modeline "1400x1050"  129   1400 1464 1656 1960
                                  1050 1051 1054 1100 +HSync +VSync
    
    # 1400x1050 @ 70Hz, 76.8 kHz hsync
        Modeline "1400x1050"  151   1400 1464 1656 1960
                                  1050 1051 1054 1100 +HSync +VSync
    
    # 1400x1050 @ 75Hz, 82.3 kHz hsync
        Modeline "1400x1050"  162   1400 1464 1656 1960
                                  1050 1051 1054 1100 +HSync +VSync
    
    # 1400x1050 @ 85Hz, 93.2 kHz hsync
        Modeline "1400x1050"  184   1400 1464 1656 1960
                                  1050 1051 1054 1100 +HSync +VSync
    
    # -- 1600x1200 --
    # 1600x1200 @ 60Hz, 75.00 kHz hsync
        Modeline "1600x1200"  162   1600 1664 1856 2160
                                    1200 1201 1204 1250 +HSync +VSync
    # 1600x1200 @ 70 Hz, 87.50 kHz hsync
        Modeline "1600x1200"  189    1600 1664 1856 2160
                                     1200 1201 1204 1250 -HSync -VSync
    # 1600x1200 @ 75 Hz, 93.75 kHz hsync
        Modeline "1600x1200"  202.5  1600 1664 1856 2160
                                     1200 1201 1204 1250 +HSync +VSync
    # 1600x1200 @ 85 Hz, 105.77 kHz hsync
        Modeline "1600x1200"  220    1600 1616 1808 2080
                                     1200 1204 1207 1244 +HSync +VSync
    
    # -- 1800x1400 -- 
    
    # 1800x1440 @ 64Hz, 96.15 kHz hsync 
        ModeLine "1800X1440"  230    1800 1896 2088 2392
                                     1440 1441 1444 1490 +HSync +VSync
    # 1800x1440 @ 70Hz, 104.52 kHz hsync 
        ModeLine "1800X1440"  250    1800 1896 2088 2392
                                     1440 1441 1444 1490 +HSync +VSync
    
    # -- 1920x1200 --
    
    # 1920x1200 @ 70Hz, 87.50 KHz hsync
        Modeline "1920x1200"  230    1920 1936 2096 2528
                                     1200 1201 1204 1250 +HSync +VSync
    
    EndSection
    
    # **********************************************************************
    # Graphics device section
    # **********************************************************************
    
    Section "Device"
        Identifier        "Generic VGA Card"
        VendorName        "Unknown"
        BoardName         "Unknown"
        Chipset           "generic"
    EndSection
    
    
    Section "Device"
        Identifier         "Intel 815"
        VendorName         "Intel&#40;R&#41; 815 Chipset Video BIOS"
        VideoRam           4096
    EndSection
    
    
    # **********************************************************************
    # Screen section
    # **********************************************************************
    
    # The kernel framebuffer server
    Section "Screen"
        Driver      "fbdev"
        Device      "Generic VGA Card"
        Monitor     "GSM3ad7"
        Subsection  "Display"
    #        Depth       16
            Depth      16
            Modes       "default"
        EndSubsection
    EndSection
    
    # The 16-color VGA server
    Section "Screen"
        Driver      "vga16"
        Device      "Generic VGA Card"
        Monitor     "GSM3ad7"
        Subsection "Display"
            Modes       "640x480" "800x600"
            ViewPort    0 0
        EndSubsection
    EndSection
    
    # The Mono server
    Section "Screen"
        Driver      "vga2"
        Device      "Generic VGA Card"
        Monitor     "GSM3ad7"
        Subsection "Display"
            Modes       "640x480" "800x600"
            ViewPort    0 0
        EndSubsection
    EndSection
    
    
    # The svga server
    Section "Screen"
        Driver      "svga"
        Device      "Intel 815"
        Monitor     "GSM3ad7"
        DefaultColorDepth 16
    
        Subsection "Display"
            Depth       16
            Modes       "1024x768" 
            ViewPort    0 0
        EndSubsection
    EndSection
    
    # The accel server
    Section "Screen"
        Driver      "accel"
        Device      "Intel 815"
        Monitor     "GSM3ad7"
        DefaultColorDepth 16
    
        Subsection "Display"
            Depth       16
            Modes       "1024x768" 
            ViewPort    0 0
        EndSubsection
    EndSection

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