[Bug 88449] [hsw hdmi] display not detected in low ambient temperature

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88449

--- Comment #16 from samuelchueh <samuelchueh at asustor.com> ---
Below(==>) is my answers for your question:

Do you get a picture on screen from BIOS when you boot up, before the kernel
and i915 are loaded, in the non-working conditions?
==> Yes, I can see the picture on screen from BIOS when boot up, in the non-  
working conditions. And no signal output on monitor after i915 driver loaded. 

Is the display in the same ambient temperature as the machine?
==> In the working conditions, it can output the 1080p resolution.

Can you try the machine with another display, or another machine with the same
display, in the non-working conditions?
Can you try having the machine in the non-working temperature and the display
in the working temperature, and vice versa?
==> We had tried the another monitor. And the test result is fail in the
non-working conditions. All test monitors are normal in other machines. 

Does the problem go away if you let the machine and display warm up in the low
ambient temperature? (You can e.g. unplug and replug the monitor, or just
reboot, to retry.)
==> Yes the problem go away when the machine warm up.  
==> It can display to 1024x768 resolution when unplug and replug the HDMI
cable. 
==> Can the i915 driver fix the issue? 
==> If we want to work around this issue. Do you know how to let the i915/drm
driver reset or re-detect the Edid using the linux command line?

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