[Bug 104633] Signal repeatedly lost with USB-C connection to monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104633

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|chris at chris-wilson.co.uk    |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
            Product|xorg                        |DRI
                 CC|                            |intel-gfx-bugs at lists.freede
                   |                            |sktop.org
          Component|Driver/intel                |DRM/Intel

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to nico-freedesktop.org from comment #0)
> I am connecting a Dell Latitude 5285 to a Samsung S27H850 by a USB-C cable
> (Hama USB 3.1, "full featured").
> 
> It turns out to be stable working until the first time I suspend.
> 

> Digging through the logs around the time the problem occured, I see the
> following (not sure if related or even the reason):
> 
> Jan 14 12:51:35 manager kernel: RSP: 002b:00007fff80429728 EFLAGS: 00000246
> Jan 14 12:51:35 manager kernel: Failed to release pages: bind_count=1,
> pages_pin_count=1, pin_display=0

That's an unrelated, mild warning.

> And later:
> 
> Jan 14 14:43:44 manager kernel: [drm] Reducing the compressed framebuffer
> size. This may lead to less power savings than a non-reduced-size. Try to
> increase stolen memory size if available in BIOS.
> Jan 14 14:43:51 manager kernel: usb 1-3: new high-speed USB device number 31
> using xhci_hcd
> Jan 14 14:43:52 manager kernel: acpi INT3400:00: Unsupported event [0x86]

Indicates that the USB connection dropped and triggered an interrupt that the
acpi driver didn't handle. That maybe relevant.

Please attach the drm.debug=0xe dmesg from across the suspend to see if their
is a problem closer to home.

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