[Bug 79261] [snb] [Samsung NP530U3C-A02CL] [drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=79261

Peter Weber <bugs at ttyhoney.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bugs at ttyhoney.com

--- Comment #29 from Peter Weber <bugs at ttyhoney.com> ---
Hi!

This bug is maybe related to:
https://bugs.freedesktop.org/show_bug.cgi?id=74102 # old, not fixed or
undefined
https://bugzilla.kernel.org/show_bug.cgi?id=95621 # new and fixed, was trigged
through GDM-3.16 on Wayland

Since the upgrade to GNOME 3.16 it get this error-message about a FIFO-Underrun
and switching between the TTY's lead in short time to a complete hang. The
patch from #95621 made the switchting between TTYs working again! But it
remains "unfirm" and the error message about the FIFO-Underrun remains.
Yesterday I upgraded from 3.19.3 (with patch from #95621) to 4.0.0 but it
didn't changed anything.

Unfirm means:
Sometimes Ctrl+Alt+[1-6] doesn't work, I have to switch to another TTY first
and then to the initally desired TTY. It looks like the FIFO-Message is printed
before/after that happens.

I can't say if this was trigged through GDM-3.16 or the changes in the
development of kernel 3.19.
To make this more or less a poking, I'm also affected by the following bug
since 4.0.0:
https://bugzilla.redhat.com/show_bug.cgi?id=1199890

Thanks
Peter

Hardware:
Lenovo ThinkPad X220 with Intel Core I7-3xxx, HD4000 (SandyBridge)
Software:
Archlinux with GNOME-3.16, GDM on Wayland, GNOME-Shell on X11
Vanilla-Kernel 3.19.3, 3.19.3 with patch from #95621, 4.0.0

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