Description of problem:
xrandr --ouput VGA1 --mode 1920x1200
after plugging in an external monitor that supports that resolution (tested on an F11 installation on a different machine), the entire system freezes, i.e. nothing moves, no sound and no reaction to keyboard input.
However, "xrandr -q" works and prints 1920x1200 as a possible resolution.
It also lists other resolutions, and I tried several, which also lead to the same result.
Version-Release number of selected component (if applicable):
Note that with a newer kernel (I tried 18.104.22.168-127.fc12 as well as upgrading to fc13) even the built-in monitor does not work and the system freezes right during the installation of the OS (see Bug 607864).
With 1920x1200 the freeze occurred every time I tried. With a lower resolution, it happened once that the system did not freeze, but the external monitor was not activated either.
Steps to Reproduce:
1. Start the system and log on
2. Then plug in the monitor
3. Run the xrandr command (alternatively, use System Settings -> Display) to enable the external monitor
Note that plugging in the monitor before starting up the computer, or during boot, causes the log-in screen not to be displayed, the system apparently freezing before log-in is possible.
Activation of the external monitor
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.
Please add drm.debug=0x04 to the kernel command line, restart computer, and attach
* your X server config file (/etc/X11/xorg.conf, if available),
* X server log file (/var/log/Xorg.*.log)
* output of the dmesg command, and
* system log (/var/log/messages)
to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Sorry I am confused about where to add "drm.debug=0x04". In the Grub menu I get with F12, there are two things that can be changed: The boot commands ('e') and the Kernel arguments ('a').
I tried both, but when the booting sequence started, I got an error message both times, saying that "drm.debug=0x04" was an unknown argument and would be ignored.
The problem is solved by applying the two patches below to the 22.214.171.124-127.fc12 kernel sources, rebuilding, and installing the new kernel.
Using the new kernel does not only allow me to plug-in an external monitor and use it, but also helps to accelerate graphic rendering enormously. Switching between windows is a lot faster now.
Note that I plug the external monitor in after starting X. According to somebody else's report, plugging in the monitor before starting X sometimes still causes problems.
It would be very nice if the patch could be included in an updated kernel version for yum.
Regarding the final remark above: Indeed X does not start up when the monitor is plugged in at boot time. But plugging later and using xrandr works without problems.
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