Red Hat Bugzilla – Bug 1030541
Hang if booted with multiple monitors connected
Last modified: 2015-06-29 08:55:11 EDT
Description of problem:
I have two external monitors connected to the T500 dock (one through DVI, the other through DSUB). The internal intel graphics doesn't seem to be able to handle these two together with the LCD. Previously, for a very long time (IIRC since f14), if booted with the lid closed, the two external monitors were used. After some very recent update (which I am currently trying to trace down) this stopped working on f19 and still doesn't work on f20 (to which I upgraded the machine recently). The boot process now hangs in very near where it should start the GDM and the machine stops responding.
The only way how to use it now is to boot with the lid open outside the dock, then, after the X starts, return it to the dock and then manually disable the LCD and enable the two external monitors through the xrandr. Then it works correctly till next reboot. This is very annoying.
The only relevant things that I was able to dig from the logs is the following snippet from the Xorg.log:
[ 115.078] (--) intel(0): Integrated Graphics Chipset: Intel(R) GM45
[ 115.078] (EE) intel(0): [drm] failed to set drm interface version.
[ 115.078] (EE) intel(0): Failed to become DRM master.
[ 115.078] (II) UnloadModule: "intel"
[ 115.078] (EE) Screen(s) found, but none have a usable configuration.
[ 115.078] (EE).
Fatal server error:
[ 115.078] (EE) no screens found(EE).
[ 115.078] (EE).
There are no visible problems, back traces, in the /var/log/messages / journal
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot the machine inside dock with lid closed and connected two external monitors
The machine hangs
This worked correctly in the past and stopped working now after the system was updated. This may be not xorg bug, I am trying to trace the problem down. Booting with older kernel doesn't seems to resolve the problem.
It is Intel GMA 4500MHD.
I have a very similar problem with just one screen of a ThinkPad T500.
With kernel 3.13.10-200.fc20.i686, the desktop boots fine, but with any kernel 3.14.x the boot hangs and the failure messages as provided comment #0 are found in the Xorg.log.
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