Red Hat Bugzilla – Bug 505835
External Monitor Constantly Flickers on ThinkPad T43
Last modified: 2010-06-28 08:59:12 EDT
Description of problem:
When using an external LCD monitor on the ThinkPad T43, it constantly flickers. The flickering is not huge (one can still read from the screen), but it is very unpleasant. When passing 'nomodeset' as a kernel argument at startup, this problem disappears. However, this is just a workaround that indicates that there is a bug with kernel modesetting.
Steps to Reproduce:
1. Install Fedora 11 on ThinkPad T43
2. Boot the T43 with an external monitor plugged in.
The external monitor (LCD) constantly flickers.
The external monitor (LCD) does not flicker.
As mentioned in the introduction, passing 'nomodeset' as kernel argument is a temporary workaround for this problem.
Reassigning to kernel as per comment #0.
Can you attach the contents of /var/log/dmesg after booting with modesetting enabled, and also /var/log/Xorg.0.log from booting with it enabled and also with it disabled? (separate attachments, plain text)
No problem, I will supply the contents of /var/log/dmesg and /var/log/Xorg.0.log as soon as I have access to the T43 again, but it might take a little while. Sorry for the delay.
Created attachment 375593 [details]
File /var/log/dmesg after starting T43 with 'nomodeset' argument
Created attachment 375594 [details]
File /var/log/dmesg after starting T43 without 'nomodeset' argument
Created attachment 375595 [details]
File /var/log/Xorg.0.log after starting T43 with 'nomodeset' argument
Created attachment 375596 [details]
File /var/log/Xorg.0.log after starting T43 without 'nomodeset' argument
I have just uploaded the requested files. To avoid misunderstandings, I should make two comments:
1) I obtained the uploaded files without an external monitor plugged in. If you want the files with external monitor plugged in let me know.
2) The T43 is in the same configuration as on 2009-06-14 (when I filed the bug report). That is, I have not updated (yum update) it in between (because I had no access to it and nobody else had either). I am going to update the T43 tomorrow, so if you still want me to do something with the T43 in the unchanged configuration let me know by tomorrow.
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