[Bug 90128] Big monitor has blank display (HDMI or DVI) in any kernel since and including 3.13 (despite earlier fixes)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90128

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEEDINFO

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to philipmorant from comment #9)
> After
> git clone
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> and
> git clone  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> I am unable to find commit 0a03ea9496b49746b4964d05cc1f483385d1df8a
> However commit bc49a7831b1137ce1c2dda1c57e3631655f5d2ae comes a few days
> later than 0a03ea, and I can see that the problematic function
> hdmi_port_clock_limit() has been changed.  So I compiled it and tested.
> 
> The situation has not changed.  At boot up the WQHD monitor is switched off.
> I can call xrandr --newmode and xrandr --addmode and xrandr --output HDMI1
> ..., and xrandr (and also the ubuntu Display applet) report that they're
> happy, BUT the monitor is switched to standby mode, ie not showing anything.
> 
> Neither syslog nor xorg.log show any errors.  This is all:
> [  1566.989] (II) intel(0): resizing framebuffer to 4480x1440
> [  1567.034] (II) intel(0): switch to mode 1920x1080 at 60.0 on VGA1 using pipe
> 1, position (2560, 360), rotation normal, reflection none
> [  1567.153] (II) intel(0): switch to mode 2560x1440 at 29.9 on HDMI1 using
> pipe 0, position (0, 0), rotation normal, reflection none

Please attach a full dmesg from boot up to when you see the problem, with
drm.debug=0xe passed to the kernel command line. And if possible please do so
with a fresh kernel built from 'git://anongit.freedesktop.org/drm-tip drm-tip'

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