Red Hat Bugzilla – Bug 715110
[Sandybridge] Intel driver reports failed to set mode: invalid argument with KMS enabled
Last modified: 2012-08-07 10:44:18 EDT
Created attachment 505893 [details]
Description of problem:
Booting a Thinkpad T520 with Kernel Mode Setting (KMS) enabled connected to a docking station with an external monitor results in X not starting and the intel driver reporting "failed to set mode: invalid argument".
Booting with KMS enabled with the laptop display or an external monitor connected directly to the laptop results in X starting.
Booting the same setup (Thinkpad T520 connected to a docking station with external monitor) boots correctly although uses the vesa driver.
Booting the Network Install CD with the laptop connected to the docking station results in a black screen when the graphical installer attempts to load.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install F15 when laptop is not connected to docking station
2. Connect the laptop to the docking station
X won't start
X will start
Created attachment 505895 [details]
Created attachment 505896 [details]
Created attachment 505897 [details]
Intel Core i7-2620M
Booting the same setup without KMS (Thinkpad T520 connected to a docking station with external monitor) boots correctly although uses the vesa driver.
I partially confirm this bug: on my MacBook Air 2011 11" I can start X only using 'nomodeset' option in grub2 and X starts with vesa driver. I can use 'fbdev' too, but with very strange results. Any attempt to use intel drivers, fails miserably...
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