I would guess that option exposes DOS-era VGA support, which is still
used by operating systems before they boot. While that shouldn't affect
the operation of Linux after it has booted, it might, if it changes the
default dithering mode on the hardware and Linux doesn't change it after
that.
Now
Update: in the motherboard settings, under I/O, there's an option "Video
Option ROM Type". This bug occurs when the value is set to UEFI. When
the value is set to Legacy, the bug does not occur. There's a third
possible value, "Disabled" or similar, which I did not try.
Excuse me ignorance. I
Great!
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => Fix Released
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Yes, Daniel. The picture is normal at all available rates above 60Hz.
120Hz and 144Hz. Awesome.
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https://bugs.launchpad.net/bugs/1852166
Title:
[nouveau] Pixel pattern error at 120Hz
Is the "pixel pattern error" gone?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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It seems that I am able to set the refresh rate to 120Hz and 144Hz.
Feel free to close this.
xserver-xorg-video-nouveau 1:1.0.16-1
Linux shahar-desktop 5.3.0-46-generic #38-Ubuntu SMP Fri Mar 27 17:37:05
UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
No LSB modules are available.
Distributor ID:
** Summary changed:
- [nouveau] Pixel pattern error at 120Hz or 144Hz, but 60Hz works (MSI monitor
model 1462)
+ [nouveau] Pixel pattern error at 120Hz or 144Hz, but 60Hz works (monitor MSI
Optix G24C / model 1462)
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I would like to mention the exact monitor model in the bug description
but don't have a clear answer for that:
[ 1165.229] (II) modeset(0): Manufacturer: MSI Model: 1462 Serial#: 1
[ 1165.229] (II) modeset(0): Year: 2018 Week: 16
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Unless we can diagnose and fix/workaround bug 1856507 quickly then I am
out of ideas for now.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => New
** Summary changed:
- [nouveau] Pixel pattern error at 120Hz or
Thank you for the instructions, Daniel.
I did uncomment the above line using sudoedit, installed nvidia-
driver-435 and rebooted.
No apparent change. Still no login screen.
Reported:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers-435/+bug/1856507
Can progress be made on
Thanks. That's a different bug but I don't want to dwell on it here.
Please try editing /etc/gdm3/custom.conf and uncommenting the line:
#WaylandEnable=false
If that gets you the login screen then please tell us if this bug is
still an issue.
If that doesn't get you the login screen then
Thank you for following up, Daniel.
With the NVIDIA driver, the login screen doesn't show up.
What would be the appropriate next step, please?
** Attachment added: "Login screen doesn't show up with NVIDIA driver."
No we don't yet know what project to report any bug to "upstream".
Next please install the Nvidia driver via:
Software & Updates > Additional Drivers
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Thank you for following up, Daniel.
Same in an Ubuntu on Wayland session.
I tried setting dithering depth and dithering mode but it doesn't
change.
Should this be reported upstream?
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I can see a couple of pixel-layout-related settings here:
dithering depth: auto
supported: auto, 6 bpc, 8 bpc
dithering mode: auto
supported: auto, off, static 2x2, dynamic 2x2, temporal
The nouveau kernel driver provides them regardless of the
One interesting observation is that your logs are saying that 60Hz is
the preferred native mode of the monitor:
[ 1165.229] (II) modeset(0): First detailed timing is preferred mode
[ 1165.229] (II) modeset(0): Preferred mode is native pixel format and refresh
rate
...
[ 1165.229] (II)
Does the problem occur if you log into 'Ubuntu on Wayland' ?
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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** Attachment added: "Comparison image"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1852166/+attachment/5310145/+files/comparison.png
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I don't feel that a non-close-up photo could help, but here is one. From
a normal viewing distance, when higher than 60hz, the image seems to
have decreased brightness. Only on close up one can tell that it does
not appear to be brightness, but a wrong pixel pattern.
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