Created attachment 120833 [details]
good dmesg with debug
This is a followon to meiling list bug report with subject
bisected: i915 modeset broken in ac9b8236551d1177fd07b56aef9b565d1864420d
Between 4.4-rc3 and 4.4-rc4, i915 modesetting broke on my i5-2400 PC.
Instead of seeing the new dense graphics mode, I see the last VGA text
lines and no X appears either.
I saw something similar on I865G but have not had time to check if it is
the same issue.
ac9b8236551d1177fd07b56aef9b565d1864420d is the first bad commit
Author: Ville Syrjälä <firstname.lastname@example.org>
Date: Fri Nov 27 18:55:26 2015 +0200
drm/i915: Introduce a gmbus power domain
Currently the gmbus code uses intel_aux_display_runtime_get/put in an
effort to make sure the hardware is powered up sufficiently for gmbus.
That function only takes the runtime PM reference which on VLV/CHV/BXT
is not enough. We need the disp2d/pipe-a well on VLV/CHV and power well
2 on BXT. So add a new power domnain for gmbus and kill off the now
unused intel_aux_display_runtime_get/put. And change
intel_hdmi_set_edid() to use the gmbus power domain too since that's all
we need there.
Also toss in a BUILD_BUG_ON() to catch problems if we run out of
bits for power domains. We're already really close to the limit...
[Patrik: Add gmbus string to debugfs output]
Signed-off-by: Ville Syrjälä <email@example.com>
Reviewed-by: Patrik Jakobsson <firstname.lastname@example.org>
[Cherry-picked from drm-intel-next-queued f0ab43e6 (Imre)]
Signed-off-by: Imre Deak <email@example.com>
Signed-off-by: Jani Nikula <firstname.lastname@example.org>
:040000 040000 39379146d7e6dda8a4d5f8781ee3d307cce8c47e f4f09fae0485ad6263d31d425296fa9cd7de343b M drivers
As per Ville Syrjäläs suggestion, attached are boot logs with drm.debug=0xe.
Monitor is connected via DVI.
Created attachment 120834 [details]
bad dmesg with debug
Author: Daniel Vetter <email@example.com>
Date: Wed Jan 13 11:55:28 2016 +0100
drm/i915: Init power domains early in driver load