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#1 2021-11-27 03:43:01

hwallace
Member
Registered: 2021-08-30
Posts: 106

trouble with CometLake-U GT2 - tearing and minor screen corruption

CometLake-U GT2 [UHD Graphics]

Screen tearing and zigzag lines in some text fields

I'm having difficulty interpreting  https://wiki.archlinux.org/title/intel_graphics. There are many branches and options well covered but I don't know which apply to my case.

However I have done this much

- Installed intel-ucode.img, mesa,linux-firmware

- Following https://wiki.archlinux.org/title/intel_graphics#Tearing


Section "Device"
  Identifier "Intel Graphics"
  Driver "intel"
  Option "TearFree" "true"
EndSection

But then lightdm fails to start because of X config errors

From /var/log/Xorg.0.log

    24.846] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Nov 26 19:17:37 2021
[    24.846] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    24.846] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    24.846] (==) No Layout section.  Using the first Screen section.
[    24.846] (==) No screen section available. Using defaults.
[    24.846] (**) |-->Screen "Default Screen Section" (0)
[    24.846] (**) |   |-->Monitor "<default monitor>"
[    24.847] (==) No device specified for screen "Default Screen Section".
	Using the first device section listed.
[    24.847] (**) |   |-->Device "Intel Graphics"
[    24.847] (==) No monitor specified for screen "Default Screen 

From /var/log/lightdm/Xorg.0.log

(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE) 
Fatal server error:
(EE) no screens found(EE) 
(EE) 

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#2 2021-11-27 10:04:10

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,427

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

Can you post a screenshot/cam picture/video? The phenomenon known as tearing in the common sense does not usually happen with static fields like a text field. Are the applications in question Qt? There's a known bug affecting certain intel chipsets and the current mesa version: see https://bbs.archlinux.org/viewtopic.php … 8#p1989018

Also the xf86-video-intel driver you'd require for that config to work is generally buggy and not really recommended on newer GPUs

Last edited by V1del (2021-11-27 10:04:27)

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#3 2021-11-27 14:33:17

hwallace
Member
Registered: 2021-08-30
Posts: 106

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

The effects are random and infrequent so I can't reliably replicate them.

But your links are helpful. I'll poke around there.

Thanks.

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#4 2021-12-01 14:50:23

thraizz
Member
Registered: 2021-11-25
Posts: 5

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

V1del wrote:

Also the xf86-video-intel driver you'd require for that config to work is generally buggy and not really recommended on newer GPUs

Hope this is not too unrelated, but what drivers are recommended for the CometLake-U GT2 GPU? Just the modesetting driver?
Thanks smile

Last edited by thraizz (2021-12-01 14:52:02)

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#5 2021-12-01 15:02:35

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,427

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

Yes. Basically anything that's newer than ~sandybridge is often better served by the modesetting driver.

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#6 2021-12-01 16:33:51

thraizz
Member
Registered: 2021-11-25
Posts: 5

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

I switched from modesetting to xf86-video-intel, as that driver allowed for a better hardware acceleration, but discussing hardware acceleration is not related to this post so I think its better to open my own for that.
Thanks!

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#7 2021-12-01 16:40:22

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,427

Re: trouble with CometLake-U GT2 - tearing and minor screen corruption

xf86-video-intel has absolutely zero relation to hardware acceleration, zilch nada. But yes if you have questions about that you should indeed open a new thread.

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