bug#28578: xorg not starting on x200 due to recent commit

[Christopher Lemmer Webber <cwebber@dustycloud.org>]

Mark H Weaver writes:

> Danny Milosavljevic <dannym@scratchpost.org> writes:
>
>> (Does anyone mind
>>> pasting their equivalent lspci output who's saying "it works for me" on
>>> an x200?  I wonder if we can find the soruce of the difference.)
>>
>> 00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
>> 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
>> 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
>>
>> X works fine here...
>
> X also works fine on my X200 running GuixSD, although I confess I've not
> yet gotten around to reflashing Libreboot on this machine since I had to
> replace its motherboard some months ago.  I'm not sure if the use of
> Libreboot is relevant to this issue, but I would not rule out that
> possibility, since both Libreboot and the X200 proprietary BIOS perform
> early initialization of the graphics hardware.

Yeah, you're quite likely right.

I'm running Libreboot, but it may be a different version than others are.

> Here's the relevant excerpt of my lspci output:
>
> 00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
> 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
> 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
>
> Does the lspci output look different for your X200?
>
>        Mark

It looks the same.  Maybe the Libreboot version is responsible... I'm
not sure.

In the meanwhile, I've figured maybe I could test trying to set up xorg
to use a specific driver to see if that fixes it:

  (services (cons*
             ;;; ...
             (modify-services %desktop-services
                              (slim-service-type
                               startx =>
                               (xorg-start-command
                                #:configuration-file
                                (xorg-configuration-file
                                 #:drivers '("intel")))))))

However, Guix is unhappy about this:

gnu/services/xorg.scm:451:28: In procedure slim-shepherd-service:
gnu/services/xorg.scm:451:28: In procedure slim-configuration-auto-login-session: Wrong type argument: #<<program-file> name: "startx" gexp: #<gexp (apply execl #<gexp-input #<<program-file> ... 

it also doesn't work with just (xorg-start-command) either.

I'm nowhere near a modify-services expert.  Anyone have any clues?

Thanks for all the help :)