Bug 63211

Summary:	triple monitor support broken
Product:	Drivers	Reporter:	gibheer
Component:	Video(DRI - Intel)	Assignee:	intel-gfx-bugs (intel-gfx-bugs)
Status:	RESOLVED CODE_FIX
Severity:	high	CC:	daniel, intel-gfx-bugs
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	>=3.11	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	complete dmesg with debug output

Description gibheer 2013-10-18 05:23:27 UTC

Hi,

after the upgrade to Linux 3.11 triple monitor support does not work anymore with intel graphics card.
My machine is a dell latitude e6230 and triple monitor support works good with 3.10.9. With 3.11 or higher the third monitor doesn't display anything at boot time and xrandr breaks with the message "Configure crtc 2 failed".

Graphics Card from lscpi
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

Comment 1 Daniel Vetter 2013-10-18 14:23:49 UTC

Can you please retest with latest drm-intel-nightly from

http://cgit.freedesktop.org/~danvet/drm-intel/

If that's still broken please boot with drm.debug=0xe (with all three outputs connected) and attach the complete dmesg to the bug report.

Comment 2 gibheer 2013-10-23 12:03:01 UTC

Created attachment 112061 [details]
complete dmesg with debug output

It works with that branch. I also activated the flag in /etc/modprobe.d/modules.conf with the following line

options i915 drm.debug=0x

Comment 3 Daniel Vetter 2013-10-27 19:16:22 UTC

Can you please do a reverse bisect to figure out which patch to send to stable kernels?

Comment 4 gibheer 2013-10-27 19:25:04 UTC

I will try to do that in the next week.

Comment 5 Daniel Vetter 2013-12-04 09:36:12 UTC

Any updates for the bisect result? Or should we close this one, now that 3.12 is out?

Comment 6 gibheer 2013-12-04 15:42:10 UTC

I will be able to try it on Tuesday. I was not at my workplace with
the other two monitors for the last couple weeks. Sorry.

On Wed, Dec 4, 2013 at 10:36 AM,  <bugzilla-daemon@bugzilla.kernel.org> wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=63211
>
> --- Comment #5 from Daniel Vetter <daniel@ffwll.ch> ---
> Any updates for the bisect result? Or should we close this one, now that 3.12
> is out?
>
> --
> You are receiving this mail because:
> You reported the bug.

Comment 7 gibheer 2013-12-10 08:01:45 UTC

Hi,

I have booted 3.12.3 and multi monitor support is back.

Thank you very much

On Wed, Dec 4, 2013 at 4:41 PM, Gibheer <gibheer@gmail.com> wrote:
> I will be able to try it on Tuesday. I was not at my workplace with
> the other two monitors for the last couple weeks. Sorry.
>
> On Wed, Dec 4, 2013 at 10:36 AM,  <bugzilla-daemon@bugzilla.kernel.org>
> wrote:
>> https://bugzilla.kernel.org/show_bug.cgi?id=63211
>>
>> --- Comment #5 from Daniel Vetter <daniel@ffwll.ch> ---
>> Any updates for the bisect result? Or should we close this one, now that
>> 3.12
>> is out?
>>
>> --
>> You are receiving this mail because:
>> You reported the bug.

Comment 8 Daniel Vetter 2013-12-10 09:46:17 UTC

I know that 3.12 is fixed, the outstanding request was only for the bisect so that we can backport it to older kernels. But it looks like of the 3 bug reporters no one cared enough for this, so I'll close them all.