[Bug 87649] After archlinux system update switching on both of internal and external graphics card does not work anymore (vgaswitcheroo)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87649

--- Comment #10 from gofabian at posteo.de ---
(In reply to Imre Deak from comment #8)
> Based on the "vga_switcheroo: client x refused switch" message I assume some
> user space app keep the relevant device nodes open and switching isn't
> possible at that time. Did you make sure all interesting apps are stopped
> (desktop, pulse audio etc.) before switching?

You were right. The process pulseaudio still ran. I tried this:

- Stop mdm

- killall pulseaudio

- echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch

- Start mdm

i915 does not refuse to switch. BUT: The screens stay black. The dmesg output
says that the radeon driver had some errors.

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