Bug 97005 - Video sync lost on IBM ThinkPad T30
Video sync lost on IBM ThinkPad T30
Product: Red Hat Linux
Classification: Retired
Component: XFree86 (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Mike A. Harris
David Lawrence
Depends On:
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Reported: 2003-06-08 12:38 EDT by baiti
Modified: 2007-04-18 12:54 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2004-09-01 13:04:14 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description baiti 2003-06-08 12:38:34 EDT
From Bugzilla Helper:
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):

How reproducible:

Steps to Reproduce:
1. startx
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

Additional info:
Comment 1 Mike A. Harris 2004-09-01 13:04:14 EDT
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"

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