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DeadLink404

Member

Registered: 2017-11-24

Posts: 41

Blackscreen after starx (maybe backlight issue?)

On a fresh install I am struggling once again to get xorg to work.
I suspect it is a backlight issue as it was the last time, where the screen goes to 0% brightness
after in this case openbox starts. I do not know how I would confirm that though as I seem unable to change brightness.

anyway here are is the xinitrc the xorg log.

I have installed xf86-video-intel, xf86-video-nouveau and xf86-input-libinput on my optimus laptop.
Possibly relevant I have acpi_osi="!Windows 2015" set as kernel parameter because of this lockup issue.

I know this isn't much to go on but I am tapping in the dark here.

The reason I am think it is a brightness issue is that it has been that before and during boot when
systemd is loading the brightness the screen goes dark too and I cannot change the brightness in the tty.

I have tried acpi_backlight kernel parameters and with it set to video I do get acpi_video0 as well as intel_backlight
and the fn keys actually manipulate the brightness values in /sys/class/brightness/*/brightness (which they otherwise don't).
However still the only value that does anything is /sys/class/brightness/*/bl_power which I can also set with fn+f2 (lcd off).

Last edited by DeadLink404 (2018-03-14 10:45:18)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 78,857

Re: Blackscreen after starx (maybe backlight issue?)

Looks more like ann insufficient https://wiki.archlinux.org/index.php/NVIDIA_Optimus setup?

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DeadLink404

Member

Registered: 2017-11-24

Posts: 41

Re: Blackscreen after starx (maybe backlight issue?)

I am going for a Prime setup this time as bumblebee last time didn't let me control brightness either and was a bitch to set up.
As I understood it prime should just work using the open source drivers.
lspci -v gave me i915 and nouveau as the loaded drivers which I think are the correct ones I think.
though on that note the intel article suggests acpi_osi=Linux acpi_osi="!Windows 2012" and acpi_osi=
as options to try out for backlight problems.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,435

Re: Blackscreen after starx (maybe backlight issue?)

FWIW can you remove xf86-video-nouveau (not necessary in any case, since the nouveau card is never the renderer) (and intel, the modesetting driver tends to work better on newer cards anyway) . If that doesn't help already can you check if it theoretically starts to work if you blacklist nouveau? It might still be that nouveau runs into an issue here.