[Bug 108773] i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108773

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |HSW

--- Comment #3 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Julius B. from comment #0)
> I was following the information on
> https://hansdegoede.livejournal.com/19224.html to enable flicker-free bot on
> Fedora 29.
> 
> However, enabling i915.fastboot=1 results in the screen staying black during
> and after boot. No login manager is shown, and I cannot switch VTs via
> CTRL+ALT+F keys (as usual).
> 
> This happens on a Thinkpad S1 Yoga (Haswell platform), which incidentally I
> know is one of the Haswell machines available for Intel employees.
> 
> Tested kernel versions:
> Fedora kernels 4.18.18/19, 4.19.2-200 and 4.20.0-0.rc2.git2.1. 
> 
> I havent tested any mainline or git build yet. I reported
> https://bugzilla.redhat.com/show_bug.cgi?id=1639437, and was referred to
> here.
> 
> I'll try to create a dmesg with debug information, and attach it here.

Dmesg log from boot with kernel parameters drm.debug=0x1e log_buf_len=4M are
needed from latest drm-tip.
This issue could be duplicate of
https://bugs.freedesktop.org/show_bug.cgi?id=104838

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