external screen issue - hdmi switch no longer works with Qubes R3.2

[Patrick Schleizer]

Since dom0 was upgraded to R3.2 [on my test system], multi monitoring
got worse. (It is not #2084 [1].)

I need to manually set to the external display now every time (in KDE),
but I could life with that.

What is worse... That my HDMI switch that used to work fine with R3.1
(and still does on my main system) is now broken in R3.2. Direct hdmi
connection however still works. Both, KDE and XFCE are affected by that.

In XFCE monitor settings menu I did once see the external screen flash
up for a second and then vanish again.

Any idea how to fix that?

Cheers,
Patrick

[1] https://github.com/QubesOS/qubes-issues/issues/2084

[Marek Marczykowski-Górecki]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On Sat, Jul 02, 2016 at 05:07:00PM +0000, Patrick Schleizer wrote:
> Since dom0 was upgraded to R3.2 [on my test system], multi monitoring
> got worse. (It is not #2084 [1].)
>
> I need to manually set to the external display now every time (in KDE),
> but I could life with that.
>
> What is worse... That my HDMI switch that used to work fine with R3.1
> (and still does on my main system) is now broken in R3.2. Direct hdmi
> connection however still works. Both, KDE and XFCE are affected by that.

Can you elaborate on this? What exactly is the effect?

> In XFCE monitor settings menu I did once see the external screen flash
> up for a second and then vanish again.
>
> Any idea how to fix that?
>
> Cheers,
> Patrick
>
> [1] https://github.com/QubesOS/qubes-issues/issues/2084
>

- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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[Patrick Schleizer]

Marek Marczykowski-Górecki:

> On Sat, Jul 02, 2016 at 05:07:00PM +0000, Patrick Schleizer wrote:
>> Since dom0 was upgraded to R3.2 [on my test system], multi monitoring
>> got worse. (It is not #2084 [1].)
>
>> I need to manually set to the external display now every time (in KDE),
>> but I could life with that.
>
>> What is worse... That my HDMI switch that used to work fine with R3.1
>> (and still does on my main system) is now broken in R3.2. Direct hdmi
>> connection however still works. Both, KDE and XFCE are affected by that.
>
> Can you elaborate on this? What exactly is the effect?

R3.1
- if external screen is directly connected: visible in monitor settings
and functional
- if external screen is to a HDMI switcher first and then indirectly to
the computer: visible in monitor settings and functional

R3.2
- if external screen is directly connected: visible in monitor settings
and functional
- if external screen is to a HDMI switcher first and then indirectly to
the computer: not visible in monitor settings and no monitor signal

[Doug Hill]

Patrick Schleizer:

Hi,

I'm having a similar issue, but in my case, with a direct HDMI1
connection, my monitor will not wake from sleep.

After some searchng, I discovered this may be caused by a known bug in
xfce. I was able to replicate this behavior under Mint 18 xfce on the
same machine.

xfsettingsd resets TV mode to NULL on power cycle
Bug: https://bugzilla.xfce.org/show_bug.cgi?id=11107

In comment #67, dated 2016-08-12, a patch appears on its way. This is a
new world for me, and a translation would be appreciated... I'm guessing
the patch eventually works its way through the system... how long does
that take?

Many thanks,

Doug