Red Hat Bugzilla – Bug 810192
[snb] non-VGA outputs will not work in Optimus configs
Last modified: 2014-09-14 20:03:30 EDT
Description of problem:
Docking station DVI output doesn't work on Lenovo ThinkPad T520 with two GPUs while using only Intel HD3000. VGA port works fine.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
0. Disable nVidia GPU in BIOS or force kernel to use i965 driver instead of nouveau.
1. Attach notebook to docking station.
2. Connect monitor to DVI port.
Monitor is not recognized on DVI.
VGA works fine.
i965 driver should support DVI port.
Using docking station ThinkPad Mini Doc Series 3.
T520 with 2 GPUs: Intel HD3000 and nVidia NVS 4200M. nVidia was disabled in BIOS.
T520 Smolt profile: http://www.smolts.org/client/show/pub_443763e9-7509-4924-9a32-3a94212f0bfd
The "two GPUs" part is why this is tragic, and not going to work until we have proper Optimus support. Digital outputs besides the laptop panel are simply not connected to the i915 chip on a machine like this.
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