[Bug 216950] New: DisplayPort USB-C hub issue

[Bjorn Helgaas]

On Wed, Jan 18, 2023 at 07:49:38PM +0000, bugzilla-daemon at kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=216950
>            Summary: DisplayPort USB-C hub issue
>     Kernel Version: 6.2.0-rc3
> ...
> Created attachment 303624
>   --> https://bugzilla.kernel.org/attachment.cgi?id=303624&action=edit
> dmidecode + kern.log
> 
> I have HP 845 EliteBook G7 (Ryzen) and before 6.2.0-rc3 installation
> there was no issue with my laptop and HP docking station via USB-C.
> 
> This kernel display behaves weirdly. LCD monitor (connected to
> docking station via DisplayPort) wakes up only once after reboot.
> Second docking connection ends up with blank external screen and
> only restart helps.
> 
> Display manager detects extra screen and even newly launched apps
> land there.
> 
> I didn't have such issues with original distro kernel
> 5.16.15-76051615-generic

This report (which looks like a regression between
5.16.15-76051615-generic and 6.2.0-rc3) was raised against PCI, but I
don't see PCI issues in the logs.  Any DRM ideas?

Bjorn