[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

--- Comment #20 from Johannes Berg <johannes at sipsolutions.net> ---
Created attachment 142238
  --> https://bugs.freedesktop.org/attachment.cgi?id=142238&action=edit
config that doesn't boot

So I've been trying to figure out why one .config works, and another doesn't.

In the process, I've arrived at the previously attached .config
(config-working.txt) that doesn't exhibit the issue, but I don't have working
sound. Note that this config also doesn't exhibit bug 108462.

Now, since I was trying to _also_ make sound work (since I'm actually fairly
happy to have a working .config, except it didn't have sound which is
annoying), I've slowly been enabling sound options. My previously attached
config-working.txt had some sound options enabled, but still no sound.

Now ... with config-notbooting.txt that I just attached, I've really only
changed sound configuration:

+CONFIG_REGMAP_I2C=m
+CONFIG_SND_HDA_EXT_CORE=m
+CONFIG_SND_SOC=m
+CONFIG_SND_SOC_TOPOLOGY=y
+CONFIG_SND_SOC_ACPI=m
+CONFIG_SND_SOC_INTEL_SST_TOPLEVEL=y
+CONFIG_SND_SOC_INTEL_SST=m
+CONFIG_SND_SOC_INTEL_SKYLAKE=m
+CONFIG_SND_SOC_ACPI_INTEL_MATCH=m
+CONFIG_SND_SOC_INTEL_MACH=y
+CONFIG_SND_SOC_I2C_AND_SPI=m

REGMAP_I2C got pulled in extra, apparently.

Here's the weird part: this .config doesn't even boot properly. The external
screens are not initialized at all, and even the internal panel doesn't get the
right resolution in the fedora boot/disk password screen!! It also doesn't boot
fully, I get to enter my password but it doesn't get to the display manager.

Looks like I have a choice between
 * kernel with working graphics and no sound
 * kernel with flickering graphics but sound
 * kernel 4.13 (or perhaps 4.15?)

Can anyone explain to me why selecting the sound options should have any impact
on the graphics? Clearly it does though ... I can file a separate bug on that
though, if you prefer.

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