Red Hat Bugzilla – Bug 97005
Video sync lost on IBM ThinkPad T30
Last modified: 2007-04-18 12:54:41 EDT
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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3.1) Gecko/20030527
Description of problem:
I am running a standard RH 9 installation on an IBM ThinkPad T30 Mod 2366-97G.
The grafics hardware is identified by lspci as:
ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]
When the system isn't touched for a while and the screen blanking kicks in then
when the mouse is moved or a key is pressed the video comes back out of sync.
The same effect can be forced by pressing Fn-F3 (which explicitly turns the LCD
Other than terminate/restart of X11 or rebooting the system the only method that
resyncs the screen is to go through a suspend/resume cycle via Fn-F4 key
In addition to this problem, the Fn-F7 that is supposed to cycle from LCD ->
LCD+CRT -> CRT is a dead key that does not have any effect. The video signal is
always sent to both, the LCD and the external CRT. Unfortunately switching to a
lower resolution does not seem to reduce the horizontal sync frequency at all
which is very bad if one needs to connect to a projector that doesn't sync at
the higher frequency.
Very interesting is that booting a Knoppix-3.2 CD which also comes with
XFree86-4.3.0 does _NOT_ exhibit this problem. Fn-F3 works just fine and so does
screen blanking as a result of being idle for a while.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
2. press Fn-F3 to turn the LCD off
3. press any key to turn the LCD back on
alternatively: just wait till screen blanks automatically
Actual Results: the result is a video screen that has lost synchronization
Expected Results: cleanly synced video display
Sounds like a non-XFree86 problem, possibly kernel, possibly
kernel/X/BIOS interaction. Please upgrade to Fedora Core 2
and if the problem persists, test xorg-x11 from rawhide. If it
still occurs, please file a bug report in upstream X.Org bugzilla
at http://bugs.freedesktop.org in the "xorg" component, and
if you paste the URL here, we will track the issue in upstream
Thanks in advance for testing rawhide xorg.
Setting status to "RAWHIDE"