On Mon, May 27, 2019 at 04:57:48AM -0600, Theo de Raadt wrote:
> Claudio Jeker <cje...@diehard.n-r-g.com> wrote:
>
> > On Sat, May 25, 2019 at 03:53:03PM +0100, Maurice McCarthy wrote:
> > > On 25/05/2019, Timo Myyrä <timo.my...@bittivirhe.fi> wrote:
> > > > Tristan Pilat <cont...@tristanpilat.com> writes:
> > > >
> > > >> Hi OpenBSD users and devs!
> > > >>
> > > >> I got a new laptop in January, a thinkpad x280. At that time my system
> > > >> running 'current' was very slow and I assumed the video acceleration
> > > >> wasn't working so I just sadly stuck with Debian for a while. I then
> > > >> saw that an update of the inteldrm landed in current a month ago or so
> > > >> so I tried yesterday to reinstall current. Unfortunately the system is
> > > >> still barely usable. Could you guys tell me why the video acceleration
> > > >> isn't handled? Isn't Kaby lake compatible for now? I saw this article
> > > >> (https://jcs.org/2017/05/22/xiaomiair) which says it is.
> > > >>
> > >
> > > You may have to adjust the aperture
> > > See /etc/examples/sysctl.conf
> > >
> > > #machdep.allowaperture=2 # See xf86(4)
> > >
> >
> > Nope. That does not help. I bet the issue is not related to anything
> > related to inteldrm. It is most probably an interrupt storm happening
> > because of Thunderbolt 3. At least that seems to be something people
> > complained about.
>
> Same sort of thing happened with x1rev6, but various folk figured out BIOS
> options which could prevent it, and newer BIOS replacements also improved
> the situation. Please study it and see if you can find some clues.
I'm up-to-date with the newest BIOS on my X1 6th but I see acpi0
eating lots of CPU if I connect a displayport device. Playing with
options does not fix this for me. The workaround I'm using now see
below) is very unsatisfactory, but I have no clue on where I should be
looking for a real fix and no one with knowledge in this area has
surfaced to look into this problem.
-Otto
Index: acpi.c
===================================================================
RCS file: /cvs/src/sys/dev/acpi/acpi.c,v
retrieving revision 1.367
diff -u -p -r1.367 acpi.c
--- acpi.c 12 May 2019 15:52:52 -0000 1.367
+++ acpi.c 27 May 2019 11:07:52 -0000
@@ -2262,6 +2262,10 @@ acpi_gpe(struct acpi_softc *sc, int gpe,
struct aml_node *node = arg;
uint8_t mask, en;
+ static unsigned short count111;
+ if (gpe == 111 && count111++ != 0)
+ return 0;
+
dnprintf(10, "handling GPE %.2x\n", gpe);
aml_evalnode(sc, node, 0, NULL, NULL);
