i915kms.ko: when loaded with Haswell HD4600, display goes blank

[NGie Cooper]

On Thu, Jan 29, 2015 at 11:18 AM, NGie Cooper <yaneurabeya at gmail.com> wrote:
> On Thu, Jan 29, 2015 at 10:52 AM, O. Hartmann
> <ohartman at zedat.fu-berlin.de> wrote:
>>
>> Having trouble with loading i915kms.ko on a Haswell-based Lenovo ThinkPad E540. The
>> laptop is equippted with a Intel i5-4200M CPU with integrated HD4600 iGPU. Recent update
>> of CURRENT and loading of i915kms.ko turns the display immediately blank. Laptop is
>> accessible via ssh and network. Only display is dead.
>>
>> I suppose this a bug?
>
> Yes, very much so. What's your svn revision and can you please create
> a bug for this issue?

Please also read the thread titled "drm2 regression: backlight
adjustment on ivybridge no longer works" first to see if the symptoms
describe there match your's.