Bug 187601 - Screen freezes on boot at "fb: switching to inteldrmfb from VESA VGA
Summary: Screen freezes on boot at "fb: switching to inteldrmfb from VESA VGA
Status: RESOLVED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(Other) (show other bugs)
Hardware: Intel Linux
: P1 normal
Assignee: drivers_video-other
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-11-14 15:16 UTC by A. Budden
Modified: 2016-11-16 15:32 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.8.7
Tree: Mainline
Regression: No


Attachments

Description A. Budden 2016-11-14 15:16:56 UTC
I think this is probably related to #86551, but that issue was fixed in 3.17/3.18 and my issue is still present in 4.8.0, 4.8.6 and 4.8.7.

When I recently installed Ubuntu 16.10 on a new machine (ASRock Z170 Gaming-ITX/AC S1151 M-ITX Intel Motherboard with Intel Core Skylake Processor i5-6500/3.2 GHz Processor CPU), I got a blank screen on first boot.  Removing "quiet splash" allows it to boot up until the message:

    fb: switching to inteldrmfb from VESA VGA

I can get it to boot with "nomodeset", but then the graphics options are very limited if I start X.  Some websites suggest removing the "vga=" bit of my boot line, but I don't have one to remove so I can't do that.

There is a full dmesg output for a non-nomodeset (blank screen) boot here: http://pastebin.com/HA8SNQJa and a full dmesg output for a nomodeset boot here: http://pastebin.com/gL5bvSXp (these were captured with 4.8.6, but I've noticed no difference with 4.8.7).

There is a lot more information about the various things I have tried (and some configuration files) in this askubuntu.com question (and in one or two of my comments in responses to the answers): 

http://askubuntu.com/questions/845842/intel-skylake-blank-screen-on-ubuntu-16-10/846865

I can obviously post more information as required.
Comment 1 A. Budden 2016-11-14 18:20:02 UTC
As discussed in the newy accepted answer to the askubuntu.com question, this appears to be fixed in the drm-intel nightly build on 2016-10-19 of 4.9.0.
Comment 2 Jani Nikula 2016-11-16 15:32:06 UTC
For future reference, please file drm/i915 bugs at https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel

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