I have a CentOS 4.3 workstation I use for experimentation on my desk at work. It was plugged into an old LG 14" monitor, and I switched the video cable to a Samsung 17" LCD without rebooting. The screen resolution was set to 800x600 on the 14" monitor, and the display worked fine at 800x600 after switching to the Samsung 17". When I changed the resolution to 1024x764, the screen went black and I haven't been able to get it back again. I hoped rebooting and having the system search for new hardware would adjust the display driver to the correct monitor but it didn't. I booted with CD1 in rescue mode and changed /etc/inittab to start in command line mode (3), but the screen still goes black after going through some initial boot processes. I suspect the issue is driver related, rather than screen resolution related. When I initially went to change the resolution, it recognized the monitor as a generic VGA, and I changed the monitor type to Samsung Syncmaster 711T at the same time as changing the resolution. How can I get the system to recognize the new monitor? Paul G.
On 3/6/07, techlists at comcast.net <techlists at comcast.net> wrote:> I have a CentOS 4.3 workstation I use for experimentation on my desk at work. It was plugged into an old LG 14" monitor, and I switched the video cable to a Samsung 17" LCD without rebooting. > > The screen resolution was set to 800x600 on the 14" monitor, and the display worked fine at 800x600 after switching to the Samsung 17". When I changed the resolution to 1024x764, the screen went black and I haven't been able to get it back again. > > I hoped rebooting and having the system search for new hardware would adjust the display driver to the correct monitor but it didn't. I booted with CD1 in rescue mode and changed /etc/inittab to start in command line mode (3), but the screen still goes black after going through some initial boot processes. > > I suspect the issue is driver related, rather than screen resolution related. When I initially went to change the resolution, it recognized the monitor as a generic VGA, and I changed the monitor type to Samsung Syncmaster 711T at the same time as changing the resolution. > > How can I get the system to recognize the new monitor?Did you try booting in runlevel <= 3 and then system-config-display --reconfig? If that works, you could set display as vanilla as you can and then start your customisation over. Also you can peek at several options with system-config-display --help -- Eduardo Grosclaude Universidad Nacional del Comahue Neuquen, Argentina
Yes, as mentioned below, I edited /etc/inittab from rescue mode, and changed it to run level 3. And the screen still went black upon reboot. -------------- Original message ---------------------- From: "Eduardo Grosclaude" <eduardo.grosclaude at gmail.com>> On 3/6/07, techlists at comcast.net <techlists at comcast.net> wrote: > > I have a CentOS 4.3 workstation I use for experimentation on my desk at work. > It was plugged into an old LG 14" monitor, and I switched the video cable to a > Samsung 17" LCD without rebooting. > > > > The screen resolution was set to 800x600 on the 14" monitor, and the display > worked fine at 800x600 after switching to the Samsung 17". When I changed the > resolution to 1024x764, the screen went black and I haven't been able to get it > back again. > > > > I hoped rebooting and having the system search for new hardware would adjust > the display driver to the correct monitor but it didn't. I booted with CD1 in > rescue mode and changed /etc/inittab to start in command line mode (3), but the > screen still goes black after going through some initial boot processes. > > > > I suspect the issue is driver related, rather than screen resolution related. > When I initially went to change the resolution, it recognized the monitor as a > generic VGA, and I changed the monitor type to Samsung Syncmaster 711T at the > same time as changing the resolution. > > > > How can I get the system to recognize the new monitor? > Did you try booting in runlevel <= 3 and then system-config-display > --reconfig? If that works, you could set display as vanilla as you can > and then start your customisation over. > Also you can peek at several options with system-config-display --help > > > -- > Eduardo Grosclaude > Universidad Nacional del Comahue > Neuquen, Argentina > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos
-------------- Original message ---------------------- From: Scott Silva <ssilva at sgvwater.com>> techlists at comcast.net spake the following on > 3/6/2007 10:38 AM: > > Yes, as mentioned below, I edited /etc/inittab from rescue mode, and changed > it to run level 3. And the screen still went black upon reboot. > > > Then it is not related to your x configs. Have you tried going back to the > other monitor to see if the newer monitor has some issue?I don't think it's the xconfigs, I think it's the driver for the monitor. There's nothing wrong with the monitor; the boot messages display on the screen until a certain point, and then the screen blacks out. How can I get the system to look at a different driver? Paul
techlists at comcast.net wrote:> I have a CentOS 4.3 workstation I use for experimentation on my desk at work. It was plugged into an old LG 14" monitor, and I switched the video cable to a Samsung 17" LCD without rebooting. > > The screen resolution was set to 800x600 on the 14" monitor, and the display worked fine at 800x600 after switching to the Samsung 17". When I changed the resolution to 1024x764, the screen went black and I haven't been able to get it back again. > > I hoped rebooting and having the system search for new hardware would adjust the display driver to the correct monitor but it didn't. I booted with CD1 in rescue mode and changed /etc/inittab to start in command line mode (3), but the screen still goes black after going through some initial boot processes. > > I suspect the issue is driver related, rather than screen resolution related. When I initially went to change the resolution, it recognized the monitor as a generic VGA, and I changed the monitor type to Samsung Syncmaster 711T at the same time as changing the resolution. > > How can I get the system to recognize the new monitor? >It's perhaps the refresh rate capability of the LCD. Just change manually the line in /etc/X11/xorg.conf so that the VertRefresh and the HorizSync match your LCD. Before you try, you can also go through any other resolution set for X11 to see whether that works. Press CRTL-ALT-+ (NUM-PLUS). Of course you should also have a look at the X log file /var/log/Xorg.0.log Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "Your Brand" DisplaySize 380 300 HorizSync 30.0 - 83.0 <- change these VertRefresh 55.0 - 76.0 <- change these Option "dpms" EndSection Can you switch to a virtual console with CRTL-ALT-F1 for instance? Theo