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On 2015-02-12T16:39:02+00:00 Sitsofe Wheeler wrote:

Created attachment 113413
EeePC dmesg

Description of the problem:
When I boot up a v3.19 kernel on my EeePC 900 I get various drm_wait_one_vblank 
warnings.

Steps to reproduce:
1. Boot a v3.19 Linux kernel on an EeePC 900.

Expected results:
No warnings

Actual results:
Warnings like:
[    0.516749] WARNING: CPU: 0 PID: 10 at drivers/gpu/drm/drm_irq.c:1121 
drm_wait_one_vblank+0x138/0x170()
[    0.516754] vblank not available on crtc 0, ret=-22

How reproducible is the problem?
It is reproducible every time.

Additional information:
Might be related to https://lkml.org/lkml/2015/1/31/198 .

Version information:
Ubuntu 14.04
EeePC 900
xorg 1:7.7+1ubuntu8
xserver-xorg 1:7.7+1ubuntu8
xserver-xorg-video-intel 2:2.99.910-0ubuntu1.4
Linux kernel 3.19

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/0

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On 2015-02-12T17:04:48+00:00 Jani-nikula wrote:

Please try drm-intel-nightly branch of http://cgit.freedesktop.org/drm-
intel

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/1

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On 2015-02-12T17:36:19+00:00 Sitsofe Wheeler wrote:

Sadly that kernel doesn't boot at all - just an empty black screen.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/2

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On 2015-02-13T07:17:00+00:00 Jani-nikula wrote:

(In reply to Sitsofe Wheeler from comment #2)
> Sadly that kernel doesn't boot at all - just an empty black screen.

Meh. What if you cherry pick

commit f9b61ff6bce9a44555324b29e593fdffc9a115bc
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date:   Wed Jan 7 13:54:39 2015 +0100

    drm/i915: Push vblank enable/disable past encoder->enable/disable

on top of v3.19?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/3

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On 2015-02-13T15:36:44+00:00 Sitsofe Wheeler wrote:

Created attachment 113465
EeePC dmesg

f9b61ff6bce9a44555324b29e593fdffc9a115bc solves the drm_wait_one_vblank
warning but check_crtc_state (pipe state doesn't match!) still remains.
Do you want a separate bug for that?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/4

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On 2015-02-18T16:11:04+00:00 Jani-nikula wrote:

(In reply to Sitsofe Wheeler from comment #4)
> Created attachment 113465 [details]
> EeePC dmesg
> 
> f9b61ff6bce9a44555324b29e593fdffc9a115bc solves the drm_wait_one_vblank
> warning but check_crtc_state (pipe state doesn't match!) still remains. Do
> you want a separate bug for that?

Sorry for the delay - yes please. I'll try to get the referenced commit
backported to v3.19 stable kernels.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/5

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On 2015-02-18T18:17:17+00:00 Sitsofe Wheeler wrote:

New issue filed as #89209 . Feel free to close this issue as resolved
when you're ready Jani!

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/6

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On 2015-03-02T10:27:37+00:00 Jani-nikula wrote:

http://mid.gmane.org/874mq3oif5....@intel.com

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/7

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On 2015-03-02T10:27:59+00:00 Jani-nikula wrote:

Thanks for the report.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432405/comments/8


** Changed in: linux
       Status: Unknown => Fix Released

** Changed in: linux
   Importance: Unknown => Medium

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Title:
  [Toshiba Equium A100-306] WARNING: CPU: 0 PID: 968 at
  /build/buildd/linux-3.19.0/drivers/gpu/drm/drm_irq.c:1121
  drm_wait_one_vblank+0x170/0x180 [drm]()

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