Hi,
I have a Intel cherry trail machine Haier HR101CW (CPU: x5-Z8350)
which used to work fine in kernel 4.11, fails to enter X after I
upgrade to kernel version later than 4.12. Even the latest 4.15, it
can't even enter X now. There's no panic, oops and even no obvious
error log. The panel backlight seems to be off but keyboard still
responds.
Then I tried to do bisect, it tells me the commit
[b7ecf663c75eed1e764f57281f9508c49c18516e] ACPI / bus: Introduce a
list of ids for "always present" devices is the one which causes this.
After I revert this commit, the display back to normal.
Maybe the DSDT file would help for your reference.
https://gist.github.com/mschiu77/e84687cc928ac644117baf05aef47f16
Chris
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