[Bug 111668] screen goes black and loses sync after about 10-15 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111668

--- Comment #21 from Robert Dinse <nanook at eskimo.com> ---
Created attachment 145409
  --> https://bugs.freedesktop.org/attachment.cgi?id=145409&action=edit
Dmesg out, Debug enabled, kernel from https://cgit.freedesktop.org/drm-tip

Built and booted kernel 5.3.0+ from drm-tip, update-initramfs complained of all
sorts of missing firmware modules so grabbed all the current firmware from  
git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git and
installed it, still update-initramfs complains of these three missing modules:

: Possible missing firmware /lib/firmware/i915/tgl_dmc_ver2_04.bin for module
i915
W: Possible missing firmware /lib/firmware/i915/ehl_huc_ver9_0_0.bin for module
i915
W: Possible missing firmware /lib/firmware/i915/ehl_guc_33.0.4.bin for module
i915

     Do not know if any of these are relevant to my hardware, an i7-9700k CPU
with integrated graphics.

I've confirmed the screen still goes blank after about ten minutes of
inactivity of keyboard and mouse.  I've included another dmesg from boot time
until screen blank and re-enable with debug enabled.

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