[Bug 106181] New: Laptop with i915 GPU hangs changing screen brightness with kernel 4.16.x, 4.15 fine.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106181

            Bug ID: 106181
           Summary: Laptop with i915 GPU hangs changing screen brightness
                    with kernel 4.16.x, 4.15 fine.
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: oyvinds at everdot.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

My laptop has the 
VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
on the Intel(R) Core(TM) i7-5500U CPU. It uses the i915. This laptop would
totally freeze in Xorg shortly after logging into lightdm after upgrading to
Fedora 28 with kernel 4.16.3. I found that kernel 4.15.17 from FC27 works
perfectly. After wasting too much time investigating I found that disabling
redshift would allow me to login. Adjusting the display brightness with them
hotkeys makes it totally freeze immediately. No logs are written, no switching
to terminal, no SSHing into the box, no nothing, it's just dead. I can
therefore not provide more useful information unless someone tells me what to
provide or how.

What I do know is that for sure is that with kernel 4.16 adjusting the display
brightness makes the laptop totally freeze and that's probably what makes it
freeze when redshift is running. This does not happen on kernel 4.15. This is
probably a regression or problem with i915 but it could also be some problem
with the power management kernel options Fedora changed in this kernel but that
does not seem likely. I did try screwing around with the various /sys stuff
after doing a diff of the kernel configs and changing things does not appear to
make a difference.

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