TW: Display flickering…

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TW: Display flickering…

Achim Gratz

Since one of the TW updates in December the display flickers immediately
after logging into my Plasma session (not before) on my machine with an
Intel Haswell Xeon.  Switching off hardware acceleration (Shift-Alt-F12)
gets me a stable picture, so something is wrong with that part of the
graphics stack.  In December, switching back to hardware acceleration
after a while would work without the problem returning.  After another
update yesterday that didn't work anymore.  I've tried to switch the
renderer from OpenGL2.0 to OpenGL3.1 without success.  Switching off
tearing prevention seems to have resolved it (regardless of rendering
backend), but I don't know what will happen after another round of
reboot.

Did anyone experience the same or similar problems and have any hints on
what else to check?


Regards,
Achim.
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Re: [opensuse-kde] TW: Display flickering…

medwinz
On Sat, Jan 5, 2019 at 11:41 PM Achim Gratz <[hidden email]> wrote:

>
>
> Since one of the TW updates in December the display flickers immediately
> after logging into my Plasma session (not before) on my machine with an
> Intel Haswell Xeon.  Switching off hardware acceleration (Shift-Alt-F12)
> gets me a stable picture, so something is wrong with that part of the
> graphics stack.  In December, switching back to hardware acceleration
> after a while would work without the problem returning.  After another
> update yesterday that didn't work anymore.  I've tried to switch the
> renderer from OpenGL2.0 to OpenGL3.1 without success.  Switching off
> tearing prevention seems to have resolved it (regardless of rendering
> backend), but I don't know what will happen after another round of
> reboot.
>
> Did anyone experience the same or similar problems and have any hints on
> what else to check?
>
>
> Regards,
> Achim.
> --

Hi,

Sounds like Intel driver issue.
Try to add xorg configuration and see if it helps.

You can just create a file like 20-intel.conf on /etc/X11/xorg.conf.d

Section "Device"
       Identifier "Intel Graphics"
       Driver "intel"
       Option "AccelMethod" "sna"
       Option "TearFree" "true"
       Option "DRI" "3"
EndSection

And login again, or mightbe reboot.

Best,
--
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Re: TW: Display flickering…

Achim Gratz
medwinz writes:

> Sounds like Intel driver issue.
> Try to add xorg configuration and see if it helps.
>
> You can just create a file like 20-intel.conf on /etc/X11/xorg.conf.d
>
> Section "Device"
>        Identifier "Intel Graphics"
>        Driver "intel"
>        Option "AccelMethod" "sna"
>        Option "TearFree" "true"
>        Option "DRI" "3"
> EndSection
>
> And login again, or mightbe reboot.

Is there another way than looking at Xorg.0.log to figure out what the
_current_ settings are?  I think that "sna" is the default and active, I
can't figure out if DRI is 2 or 3 (both modules are available, but only
DRI2 has produced messages).  Indeed TearFree seems to be false with the
default config.


Regards,
Achim.
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Re: TW: Display flickering…

Wolfgang Bauer
There was a thread about such problems on the opensuse-factory mailinglist in
December.
Uninstalling the intel driver and using modesetting instead seemed to help.
That driver is not really supported anymore AIUI.

Kind Regards,
Wolfgang

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Re: TW: Display flickering…

Wolfgang Bauer
PS: see also http://bugzilla.opensuse.org/show_bug.cgi?id=1120172 (there are a
few more bug reports as well I think)

One note though: If you do try to uninstall xf86-video-intel, you should also
remove the 20-intel.conf that sets intel as driver, otherwise X will not start
(as it cannot load the forced driver).

Kind Regards,
Wolfgang

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Re: TW: Display flickering…

Achim Gratz
Wolfgang Bauer writes:
> One note though: If you do try to uninstall xf86-video-intel, you should also
> remove the 20-intel.conf that sets intel as driver, otherwise X will not start
> (as it cannot load the forced driver).

Hmm.  Which directory is this supposed to be in?  I don't have it in

/etc/X11/xorg.conf.d

it seems.


Regards,
Achim.
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Re: TW: Display flickering…

Felix Miata-3
Achim Gratz composed on 2019-01-05 14:38 (UTC-0500):

> Wolfgang Bauer writes:

>> One note though: If you do try to uninstall xf86-video-intel, you should also
>> remove the 20-intel.conf that sets intel as driver, otherwise X will not start
>> (as it cannot load the forced driver).

> Hmm.  Which directory is this supposed to be in?  I don't have it in

> /etc/X11/xorg.conf.d

For upstream purposes that's actually an optional directory. openSUSE includes
it by default. If you examine its contents you should find a lot of what it
contains is comments. If 20-intel.conf isn't there, it was never needed. In any
event, Haswell users don't need xf86-video-intel, which last had an upstream
release in 2015. https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/
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Re: TW: Display flickering…

Achim Gratz
In reply to this post by Achim Gratz
Achim Gratz writes:

> Wolfgang Bauer writes:
>> One note though: If you do try to uninstall xf86-video-intel, you should also
>> remove the 20-intel.conf that sets intel as driver, otherwise X will not start
>> (as it cannot load the forced driver).
>
> Hmm.  Which directory is this supposed to be in?  I don't have it in
>
> /etc/X11/xorg.conf.d
>
> it seems.

Couldn't find it anywhere, so I just de-installed the driver and
restarted X11.  THere is a warning in Xorg.0.log about a missing intel
driver, which didn't seemed to have disturbed loading the modeset
driver.  I have re-enabled vsync in the system settings for Plasma, so
far so good (I've not yet rebooted, but I expect there to be no further
problem).


Regards,
Achim.
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Re: TW: Display flickering…

Wolfgang Bauer
Am Samstag, 5. Januar 2019, 21:13:01 schrieb Achim Gratz:
> Achim Gratz writes:
> > Hmm.  Which directory is this supposed to be in?  I don't have it in
> >
> > /etc/X11/xorg.conf.d
> >
> > it seems.

No, it's not there by default.
It will only be there if you created it yourself.

But medwinz suggested to create one in his reply, so I thought I'd better
mention it.

> THere is a warning in Xorg.0.log about a missing intel
> driver, which didn't seemed to have disturbed loading the modeset
> driver.

That's normal, and just how Xorg's driver auto-detection works.
It will try to load a few depending on the graphics card(s) installed, and
then use the first one that was loaded successfully. If one from the list
cannot be loaded, you'll get a message in the log, but that's harmless.

Also happens on nvidia and radeon cards when the proprietary driver is not
installed. (and/or radeon/nouveau)

Kind Regards,
Wolfgang

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