* Regression in drm-intel caused by d91a2cb8e510
@ 2014-09-01 20:19 Alan Stern
2014-09-01 22:13 ` [Intel-gfx] " Damien Lespiau
0 siblings, 1 reply; 3+ messages in thread
From: Alan Stern @ 2014-09-01 20:19 UTC (permalink / raw)
To: Daniel Vetter; +Cc: intel-gfx, Kernel development list
Daniel:
I'm encountering a problem with the drm-intel-nightly branch in your
drm-intel repository. The symptom is that when I boot my laptop, at
some point during the start-up procedure the screen goes totally blank,
as though the backlight were turned off, and it remains that way. I
can't tell if the backlight really is off -- it may be that there's
just nothing being displayed -- and playing with the screen-brightness
function keys doesn't help.
Git bisect located the source of the problem as commit d91a2cb8e510
(drm/i915: Add 180 degree primary plane rotation support). The problem
occurs when I boot a kernel built from that commit, and it doesn't
occur when I boot a kernel built from the preceding commit
(19ac737dc3c3).
If necessary, I can get debugging info by logging in over a network
connection. Tell me what you need.
Alan Stern
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Intel-gfx] Regression in drm-intel caused by d91a2cb8e510
2014-09-01 20:19 Regression in drm-intel caused by d91a2cb8e510 Alan Stern
@ 2014-09-01 22:13 ` Damien Lespiau
2014-09-02 1:23 ` Alan Stern
0 siblings, 1 reply; 3+ messages in thread
From: Damien Lespiau @ 2014-09-01 22:13 UTC (permalink / raw)
To: Alan Stern; +Cc: Daniel Vetter, intel-gfx, Kernel development list
On Mon, Sep 01, 2014 at 04:19:23PM -0400, Alan Stern wrote:
> Daniel:
>
> I'm encountering a problem with the drm-intel-nightly branch in your
> drm-intel repository. The symptom is that when I boot my laptop, at
> some point during the start-up procedure the screen goes totally blank,
> as though the backlight were turned off, and it remains that way. I
> can't tell if the backlight really is off -- it may be that there's
> just nothing being displayed -- and playing with the screen-brightness
> function keys doesn't help.
>
> Git bisect located the source of the problem as commit d91a2cb8e510
> (drm/i915: Add 180 degree primary plane rotation support). The problem
> occurs when I boot a kernel built from that commit, and it doesn't
> occur when I boot a kernel built from the preceding commit
> (19ac737dc3c3).
>
> If necessary, I can get debugging info by logging in over a network
> connection. Tell me what you need.
It seems like Ville and Mika already caught a similar bug today, could
you give Ville's patch a go (available on the intel-gfx):
drm/i915: Don't call intel_plane_restore() when the prop value didn't change
Thanks,
--
Damien
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Intel-gfx] Regression in drm-intel caused by d91a2cb8e510
2014-09-01 22:13 ` [Intel-gfx] " Damien Lespiau
@ 2014-09-02 1:23 ` Alan Stern
0 siblings, 0 replies; 3+ messages in thread
From: Alan Stern @ 2014-09-02 1:23 UTC (permalink / raw)
To: Damien Lespiau; +Cc: Daniel Vetter, intel-gfx, Kernel development list
On Mon, 1 Sep 2014, Damien Lespiau wrote:
> On Mon, Sep 01, 2014 at 04:19:23PM -0400, Alan Stern wrote:
> > Daniel:
> >
> > I'm encountering a problem with the drm-intel-nightly branch in your
> > drm-intel repository. The symptom is that when I boot my laptop, at
> > some point during the start-up procedure the screen goes totally blank,
> > as though the backlight were turned off, and it remains that way. I
> > can't tell if the backlight really is off -- it may be that there's
> > just nothing being displayed -- and playing with the screen-brightness
> > function keys doesn't help.
> >
> > Git bisect located the source of the problem as commit d91a2cb8e510
> > (drm/i915: Add 180 degree primary plane rotation support). The problem
> > occurs when I boot a kernel built from that commit, and it doesn't
> > occur when I boot a kernel built from the preceding commit
> > (19ac737dc3c3).
> >
> > If necessary, I can get debugging info by logging in over a network
> > connection. Tell me what you need.
>
> It seems like Ville and Mika already caught a similar bug today, could
> you give Ville's patch a go (available on the intel-gfx):
>
> drm/i915: Don't call intel_plane_restore() when the prop value didn't change
Yes, that patch fixed the problem. Thank you.
Tested-by: Alan Stern <stern@rowland.harvard.edu>
Alan Stern
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-09-01 20:19 Regression in drm-intel caused by d91a2cb8e510 Alan Stern
2014-09-01 22:13 ` [Intel-gfx] " Damien Lespiau
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