after getting the kernel message "[drm] GMBUS [i915 gmbus vga] timed out, falling back to bit banging on pin 2" internal and external monitor stay dark Asus Aspire Timeline X 3820TG 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M]
Seems to be a duplicate of bug 65761 - setting bootparameter radeon.runpm=0 is a usefull workaround
(In reply to Michael from comment #0) > after getting the kernel message "[drm] GMBUS [i915 gmbus vga] timed out, > falling back to bit banging on pin 2" internal and external monitor stay dark Usually not a bug. (In reply to Michael from comment #1) > Seems to be a duplicate of bug 65761 - setting bootparameter radeon.runpm=0 > is a usefull workaround I'll trust this assesment. *** This bug has been marked as a duplicate of bug 65761 ***