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SubjectRe: Graphics on thinkpad x270 after dock/undock works only for the first time (CPU pipe B FIFO underrun)
On Fri, 29 Dec 2017, Jiri Kosina wrote:

> When I dock my thinkpad x270 [1] and run xrandr --auto, image correctly
> appears on external display.
>

[1] 00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)

> After undocking and docking again, the image on external display doesn't
> appear any more, and this pops up in dmesg
>
> [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
>
> After restarting X (no need to reboot), I am able to dock again and get
> image on external display.
>
> I don't think this is a regression, I tried a few older kernels up to
> something around 4.11, and nothing worked.

Forgot to mention: I'm observing this on (and up to) 4.15-rc5

Thanks,

--
Jiri Kosina
SUSE Labs

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