Hi Pekka,
On 09-10-2019 09:47, Pekka Paalanen wrote:
On Tue, 8 Oct 2019 22:19:45 +0200
Hans de Goede <hdego...@redhat.com> wrote:
My main reason for suggesting either one is that I personally am aware
of at least 2 issues (both related to secondary USB GPUs handling) which
are only present in master and not in the 1.20 branch and which I really
would like to see fixed before a new release. I have taking a look at
these on my to do list, but not at the top of it (yet).
Hi Hans,
it so happens that I am, too, looking at some secondary DRM device
hotplug issues. I think I've seen three different things: not enough
RandR events to make Mutter take a hotplugged device & output into use,
Xorg crash on DRM device hotplug, and failure to start with Xorg USB
DRM device plugged in.
Do you have any public records of the issues you have on your plate?
No I've not filed issues yet, since I was planning on debugging them
myself, but if are both seeing these issues then having gitlab
issues to track them might be a good idea.
I am using a gm12u320 based mini projector (Acer C120) for most of
my tests, but I believe that this will reproduce with an udl (USB 2 version)
device too. If necessary I can try to reproduce with an udl device too.
Thinking more about it I'm seeing 3 things:
1. USB GPU is not seen (not shown in xrandr --list-providers, not usable)
when present before Xorg is started.
2. Hot plugging the USB GPU sometimes causes things to crash shortly
afterwards.
3. Hot unplugging the USB GPU always causes a crash shortly
afterwards.
My test environment is xserver master + mutter/gnome-shell 3.34 on
top of Xorg. Last time I tried downgrading the xserver to 1.20 made all
3 issues go away (*)
I think I might also be seeing some variant of your "not enough hotplug
events" bug. With the gm12u320 projector when hotplugged it is listed
as "unknown" in gnome's display-settings until I change the settings
once and then it becomes "Acer" as it should be. I believe that this
issue is actually also present in the 1.20 branch.
Regards,
Hans
*) Which is why I've not given these bugs a high priority so far
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