[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
The emacs rendering bugs go away with this RandR configuration: xrandr --fb $((1920 * 3))x1080 --dpi 100 \ --output eDP-1 --mode 1920x1080 \ --output DP-2-8 --auto --left-of eDP-1 \ --output DP-2-1 --auto --left-of DP-2-8 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
I just filed #1898210 for comment #9. Note for the record that the Emacs behavior is _exactly the same_ as Firefox, and is not _always_ related to the cursor. In particular, changing window focus causes it to redraw correctly without fail. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
I will open a second bug for comment #9, then. Regarding #8 and Emacs; I am running exactly the same Emacs with exactly the same configuration (the configurations are both checkouts of exactly the same Mercurial repository) on three different machines. This is the only machine that displays that behavior (and it also has _numerous_ other display problems, as described above). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
Comment #8 looks like the same bug, which I would now assign to either emacs or xorg-server. Comment #9 looks like a different bug so let's not discuss that here. Each problem should have a separate bug report. ** Package changed: compton (Ubuntu) => xorg-server (Ubuntu) ** Also affects: emacs (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
Comment #8 looks like the same bug, which I would now assign to either emacs or xorg-server. Comment #8 looks like a different bug so let's not discuss that here. Each problem should have a separate bug report. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emacs/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
I have other problems that I assume are related but may not be the same bug, so I did not report them here; for the record (in case it helps), they include: * OBS will not repaint its preview window _at all_ and sometimes hangs UNLESS I move it to my leftmost display (DP-2-1) _and resize it_. After doing this, it is reliable and works normally on ANY display. If I don't do this, it doesn't repaint at all on any display. The UI works fine, but the video overlay (via whatever method it uses) for the preview window just shows a gray box that sometimes takes on corruption. * Electron apps run fine on DP-2-1 and DP-2-8, but if I move them to eDP-1 (located at the far right, the only unscaled panel running 3840x2160) they are _extremely_ slow to draw. Typing in the window, the characters take up to several seconds to show up on screen, and clicks take seconds to register. This is visible in Slack, Discord, Keybase, and Element. Disabling GPU acceleration (either via the app preference in Slack, or the Electron option --disable-gpu for others) causes them to run normally, with no lag. * OpenGL applications _in general_ run terribly on eDP-1; with vblank_mode=0, maximized glxgears runs over 400 fps on DP-2-1 and DP-2-8, but under 100 on eDP-1. I have seen it run as few as ~15 FPS on eDP-1 but am not seeing that currently; that may be related to other factors? * Video playback is noticeably jerky sometimes, appearing to skip or jitter frames. I have not noticed whether it matters which display I am using when this happens. Sometimes I don't notice it, sometimes it seems pretty bad. This is visible using mplayer or watching YouTube in Firefox. This is a subjective point, I cannot _measure_ the frame drops (or at least, I don't know how). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
This video shows litter at the cursor when using Swiper for Emacs
search. Note near the top left of the screen, while the search string
"bitwise" is being typed in at the bottom, that the first match (the
word Bitwise in \subtitle{Bitwise Operations}) does not correctly
repaint, with echoes of the cursor being left behind as it moves across
the word.
This is the Ubuntu-installed Emacs 1:26.3+1-1ubuntu2, using Swiper
installed from ELPA; however, this sort of corruption shows up in a
variety of cases in Emacs (this is just the most reliable method I know
to trigger it).
Compton is NOT running in this test. Xorg is modesetting. Kernel is
5.4.0-42-generic.
Firefox just glitched significantly while looking up how to reliably
determine my Xorg server module, I will upload a video of that, as well.
** Attachment added: "emacs-search.mp4"
https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+attachment/5416131/+files/emacs-search.mp4
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1893969
Title:
Characters are rendered with a slight border when using custom xrandr
scaling
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
This video is taken under the same conditions as the previous (emacs- search.mp4) video. It shows me killing a Firefox tab, and the screen covered in litter; as I edit in the Launchpad comment box and move the cursor within firefox, you can see parts of the screen repaint. The entire window does not repaint until I move the cursor to focus another window (off-screen to the right). Again, compton not running, Xorg modesetting server 2:1.20.8-2ubuntu2.4, Linux 5.4.0-42-generic. ** Attachment added: "firefox-kill-tab.mp4" https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+attachment/5416143/+files/firefox-kill-tab.mp4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
I have disabled compton as follows: * Quit Firefox and other applications that have shown these problems * Kill compton * Restart applications Unfortunately, I still see the same behavior, in just a few seconds of tinkering. I'll leave compton off until I have to start it (e.g., for Zoom, which won't run without a compositor) and see if I can get another screen shot. If that is not a suitable method to rule out compton as the culprit, please let me know how I should do so. (But it seems to me that if it is not running, it's probably not the problem.) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1893969] Re: Characters are rendered with a slight border when using custom xrandr scaling
In my experience the kind of corruption shown in comment #3 can only happen with X11 compositors. Because only X11 allows apps to defer responsibility for placing parts of the app (like characters in an editor) to a separate compositor. So this is probably a bug in compton. Less likely a bug in Xorg. ** Package changed: xorg-server (Ubuntu) => compton (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1893969 Title: Characters are rendered with a slight border when using custom xrandr scaling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compton/+bug/1893969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
