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I recently installed FC7 on my desktop machine, an Intel Celeron 2.6 with ATI Radeon 9550 and an Acer LCD AL1716 19" monitor.
As Fedora installs, all is fine, but as soon as it tries to start X when it reboots a little box starts floating around the screen saying "Input Not Supported".
I fetched an old 12" CRT monitor from my garage and plugged it in and it worked straight up, and after I log into Fedora I can swap the monitor plugs to the Acer LCD and it displays perfectly, however when I try to restart X or reboot my computer, it comes up with "Input Not Supported" again.
Howcome it works until I restart?
I've tried editing xorg.conf with my monitors h & v settings, but it still occurs (tried installing ATI drivers which crashed X so I replaced the xorg.conf with the backup and it booted fine on the CRT.
The "input not supported" is a message from the monitor telling you that it's receiving an invalid input. This is typically caused by an invalid refresh rate or screen size setting. Sometimes by an invalid color rendition setting.
Try your "switch the monitor" thing to get your 19" monitor working and then go to system-config-display to set (and save) your default values. That should fix your problem.
Note that, when you change the display settings, you get a pop-up giving you a few seconds to accept the new settings before reverting to the older (presumably, working) settings, so entering an invalid setting combination will just display the "input not supported" for a while and then revert to the previous settings, so you can try anything you want to try without too many problems.
When I used system-config-display, it allowed me to change resoulutions and colour depths but instead of previewing them and reverting, it just wrote the changes to xorg.conf, and I had to restart X, which didn't work for any combination of resolutions and colour depths.
After I receive the "Input Not Supported" message on the 19", and try to plug it into the old CRT again, I get it's equivilent of the error, ie: a blank screen and the light flashing, and have to restart X again for that monitor to display.
If I go into System > Preferences > Hardware > Screen Resolution I get a small box that has Default Settings, and is set to 1024x768, 60Hz which I can change and it reverts if it fails on the CRT, if I do it on the 19" LCD it Auto-Configures itself to suit.
This is really getting on my nerves, its been 4 days now that I've been trying to fix this.
Have you tried the aticonfig command? An aticonfig --help | less should give you several screens of command line options. Perhaps an aticonfig --initial might get you going.
By the way, most ATI boards support "dual head" operation, so you might be able to run your old monitor and your new one at the same time. (I've got an old ATI chipset in this laptop, and sometimes have it connected to my LCD TV as a second screen.)
I seem to be experiencing it as well on a HP dc5750 with Acer AL1716 LCD monitor. Shortly after the beginning of the boot process, Fedora switches to graphics mode, and all I see on my screen is "Input Not Supported". Once I successfully log in (which I do by help of an old CRT monitor sitting next to AL1716 on my desk), the system works fine in 1280x1024 mode @ 75 Hz.
HP dc5750 is supposedly using ATI Xpress 1150 chipset.
Thanks everybody. As I have never tinkered with rhgb options before, I decided to try the second solution first, and it works! In my case (Acer AL1716), the winning combination seems to be "1280x1024_72".
Once again, thank you for your help!
Last edited by peterlin; 09-13-2007 at 03:53 AM.
Reason: more detailed information on hardware used