Regression Resume Lenovo T450

[Manuel Stühn]

On Tue, May 08, 2018 at 11:16:48AM +0300, Ilya A. Arkhipov wrote:
>Hi,
>
>I have same issue (thinkpad T450s) after resume notebook cant wake up
>but on:
>  FreeBSD 12.0-CURRENT #0 r332796: Fri Apr 20 00:42:44 UTC 2018
>root at releng3.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
>with:
>drm-next-kmod-4.11.g20180224
>gpu-firmware-kmod-g20180206_1
>
># sysctl debug.bootverbose=1
># sysctl debug.acpi.suspend_bounce=1
>
>In log (I think it related):
>May  8 01:05:06 m1cro kernel: vgapci0: child drmn0 requested
>pci_set_powerstate
>May  8 01:05:06 m1cro kernel: pci0:0:2:0: Transition from D0 to D3
>May  8 01:05:06 m1cro kernel: pci0: set ACPI power state D3 on
>\_SB_.PCI0.VID_
>May  8 01:05:06 m1cro kernel: pci0: failed to set ACPI power state D3 on
>\_SB_.PCI0.VID_: AE_BAD_PARAMETER
>
>where pci0:0:2:0:
>vgapci0 at pci0:0:2:0:     class=0x030000 card=0x503617aa chip=0x16168086
>rev=0x09 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'HD Graphics 5500'
>     class      = display
>     subclass   = VGA

My T450 does resume now with an current CURRENT(r333291), but 
unfortunately i do not know why...
I tried to track down the phenomenon. I saw that the kernel seemed not 
to be involved in this matter, since the old BE equipped with a new 
kernel was able to resume. I cloned the BE capable of resuming and 
startet copying userland-stuff from the "default" BE to this BE. Stuff 
was like bin/sbin/lib/libexec folders from / and /usr and so on. It 
stayed able to resume! Then i made an installworld/installkernel of 
r333291 into this BE, (but without mergemaster)! Even after this it 
stayed able to resume!  Then I backed up the /etc folder of my "default" 
BE (which was not able to resume) and copied the /etc from the old BE to 
"default". After this, "default" was also able to resume again! 

Long story short, i'm happy my machine resumes again, but i do not have 
a clue why...


P.S.
I'm useing drm-stable-kmod, drm-next-kmod did not work for me.

--
Manuel