From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.2) Gecko/20040803 Description of problem: LCD screen flickers badly in graphics mode and all resolutions when running xorg X. This problem is only observed when using a SIS M650. I have not seen it on other graphics chips. The problem is first seen during installtion and persists after installation. In particular, fc2 was installed on dell inspiron 1000, which has a sis m650 chip, and manifests the above problem. But redhat 9, or EL-WS run OK, which may indicate that the problem is with xorg, as the other products use xfree86. When first the graphic mode is entered everything is OK, but after about a second or so flicker starts at a rate of about .5 seconds. Sometimes the vertical sync is lost completely and the screen becomes totally corrupted Version-Release number of selected component (if applicable): xorg 6.7 How reproducible: Always Steps to Reproduce: 1. Install in graphic mode 2. Run X 3. Actual Results: screen flickers, and if the mouse pointer is moved during the switch to graphic mode, sometimes the vetical sync is lost and screen moves vertially. Additional info: As I indicated this problem does not show up in xfree86, using seemingly the same sis driver for (sis m650) chip running under RH9 or EL-WS. Also note that this is new laptop from dell, so I am not sure if anyone else has oberved this yet.
I should also add that when screen flickers as described above, mouse does not respond properly either. Its response is slow and somewhat jerky, and not smooth.
Since this bugzilla report was filed, there have been several major updates to the X Window System, which may resolve this issue. Users who have experienced this problem are encouraged to upgrade to the latest version of Fedora Core, which can be obtained from: http://fedora.redhat.com/download If this issue turns out to still be reproduceable in the latest version of Fedora Core, please file a bug report in the X.Org bugzilla located at http://bugs.freedesktop.org in the "xorg" component. Once you've filed your bug report to X.Org, if you paste the new bug URL here, Red Hat will continue to track the issue in the centralized X.Org bug tracker, and will review any bug fixes that become available for consideration in future updates. Setting status to "CURRENTRELEASE".