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| BluesKaj | Hi all | 10:59 |
|---|---|---|
| PeGaSuS | hi. so, I'm facing a very weird issue. with Xubuntu 26.04, I have a thin band at the bottom of the screen constantly flickering. the flickering doesn't happen on Windows, though. it sometimes even stops flickering on Xubuntu. I'm at a loss here | 12:13 |
| root | ls | 13:27 |
| root | pwd | 13:27 |
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| CRThaze | PeGaSuS: Could be a graphics driver issue. What kind of hardware do you have? Is this a new install? Have you used other linux or ubuntu distros on this machine? | 15:56 |
| PeGaSuS | since November 2024, Windows and Xubuntu 24.04, updated to Xubuntu 26.04. never had any other distros on it | 16:07 |
| PeGaSuS | I did try to boot from a live USB, both with Ubuntu, Xubuntu and Kubuntu and all have the same issue. sometimes it goes away but a reboot (to install kernel patches) bring it back | 16:11 |
| lotuspsychje | PeGaSuS: can you try to install zoitechat, and see if that flickering goes trough the text? | 16:12 |
| lotuspsychje | PeGaSuS: https://zoitechat.org/download.php | 16:13 |
| lotuspsychje | we have been getting reports of flickering on other users too | 16:13 |
| PeGaSuS | the flickering happens even when not doing anything, on an empty desktop | 16:13 |
| lotuspsychje | yeah i understand, but i wanna see if its maybe related | 16:13 |
| lotuspsychje | PeGaSuS: here's the buglink: https://github.com/ZoiteChat/zoitechat/issues/361 | 16:14 |
| -ubottu:#ubuntu- Issue 361 in ZoiteChat/zoitechat "[Bug]: Lines of text flicker in the Text box" [Open] | 16:14 | |
| lotuspsychje | happens over xorg, wich xubuntu 26.04 also has | 16:17 |
| PeGaSuS | oh, I don't have flickering anywhere else except at the very bottom of the screen and it seems like a copy of the xfce4-panel (which I have at the top). here's a photo of how it looks like. I wonder if it's hardware related but since I don't have the issue on Windows: https://filehost.0bin.xyz/Uet_jEdvQW3b.jpeg | 16:18 |
| PeGaSuS | sometimes changing screen resolution back and forth makes it disappear | 16:20 |
| PeGaSuS | using Zoitechat makes no difference at all | 16:21 |
| lotuspsychje | PeGaSuS: i would like to know, if the flickers shows on your zoitechat | 16:22 |
| PeGaSuS | it does, at the bottom of the screen. | 16:23 |
| lotuspsychje | tnx! can you add your experience to the bug too | 16:24 |
| PeGaSuS | I think this is completely unrelated? especially since the flickering is really at the bottom of the screen (where the text input is) and is also present on the splash screen but not GRUB menu? | 16:26 |
| lotuspsychje | PeGaSuS: i think it is related, as all the zoitechat users reported it at bottom of screen, at the chatbox area | 16:27 |
| lotuspsychje | at this stage, we dont know yet where it comes from | 16:27 |
| lotuspsychje | but we see it happen on xorg users, not on wayland | 16:28 |
| PeGaSuS | right. but in my case it happens at boot time, not when I open Zoitechat. it happens with all happens, even at login screen | 16:28 |
| PeGaSuS | it happens on Ubuntu (Wayland) for me too | 16:28 |
| lotuspsychje | PeGaSuS: i understand, i idnt say it was a zoitechat bug only | 16:28 |
| lotuspsychje | hmm wich ubuntu version did you try on wayland? | 16:29 |
| PeGaSuS | 26.04, same as Xubuntu to have a fair comparison. that's why I'm starting to lean to a hardware issue but it bugs me that the issue doesn't happen on Windows, GRUB menu or BIOS and happens as soon as the splash screen appears | 16:30 |
| PeGaSuS | the test has made via a live ISO, though | 16:30 |
| lotuspsychje | PeGaSuS: 26.04 on gnome/wayland? | 16:30 |
| PeGaSuS | yes. regular Ubuntu Desktop and even Kubuntu | 16:31 |
| PeGaSuS | at this point, I'm completely lost | 16:32 |
| PeGaSuS | my laptop is a bit old, yes. it's a Lenovo Yoga 510 14-isk, touchscreen. | 16:33 |
| lotuspsychje | PeGaSuS: can you try a !nomodeset as a test? | 16:33 |
| PeGaSuS | do I add that to the GRUB_CMDLINE_LINUX_DEFAULT or GRUB_CMDLINE_LINUX? | 16:35 |
| lotuspsychje | !nomodeset | 16:35 |
| ubottu | Systems with certain graphics chipsets may not boot properly out of the box. "Temporarily Add a Kernel Boot Parameter for Testing" as discussed at https://wiki.ubuntu.com/Kernel/KernelBootParameters to add the "nomodeset" parameter there. | 16:35 |
| sonicwind | either should be fine PeGaSuS | 16:37 |
| PeGaSuS | no flickering with nomodeset. | 16:40 |
| lotuspsychje | nice, tnx for the test | 16:41 |
| lotuspsychje | PeGaSuS: do you know howto file a bug? | 16:41 |
| PeGaSuS | I don't really remember how to | 16:42 |
| lotuspsychje | PeGaSuS: ubuntu-bug linux from terminal | 16:42 |
| lotuspsychje | add a title + description | 16:42 |
| lotuspsychje | and share your bug ID in the support channel after please | 16:43 |
| sonicwind | PeGaSuS, what happens with sudo dmesg -H | grep -iE 'drm|nvidia|gpu|error' | 16:46 |
| PeGaSuS | I rebooted without the nomodeset option to have a clean slate: https://bpa.st/RL4A | 16:51 |
| sonicwind | what a mess :-P | 16:52 |
| PeGaSuS | no idea why, it always worked, since Nov 2024 | 16:53 |
| PeGaSuS | I probably mangled it by installing something? | 16:53 |
| sonicwind | have you tried a different kernel by chance? | 16:55 |
| PeGaSuS | I only have 7.0.0-29-generic and 7.0.0-28-generic, iirc. nothing older than that. it used to work fine until a few days ago | 16:57 |
| sonicwind | check your PM PeGaSuS , sent you some stuff | 16:58 |
| PeGaSuS | yeah, BIOS should be updated, though. | 17:00 |
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| PeGaSuS | so, reported: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163092 | 17:30 |
| -ubottu:#ubuntu- Launchpad bug 2163092 in linux (Ubuntu) "i915: 2-5px flickering band at the bottom of the screen on eDP-1 with LP140WF6-SPB1 panel (Skylake HD 520)" [Undecided, New] | 17:30 | |
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| DrMax | is there a way to set KDE's subpixel aliasing to grayscale? | 20:55 |
| cbreak_ | DrMax: you can select the subpixel rendering in the fonts settings | 21:01 |
| cbreak_ | screens do not have grey pixels, they have red, green and blue ones, you have to select the correct order for your screen. | 21:02 |
| DrMax | ok, but no. I want them grayscale. Like in gnome-tweaks. | 21:03 |
| cbreak_ | so, the only way to get below pixel level is to address the individual color sub-pixels directly | 21:03 |
| DrMax | I do not want blue shadows on a side and red on the other | 21:03 |
| cbreak_ | then turn off sub-pixel rendering | 21:03 |
| DrMax | but then I get no anti-aliasing | 21:03 |
| cbreak_ | that should be separate | 21:04 |
| DrMax | It is not in kde systemsettings | 21:04 |
| cbreak_ | System Settings -> Text & Fonts | 21:04 |
| DrMax | in gnome-tweaks, you have subpixel for LCDs, standard (grayscale) or none | 21:05 |
| cbreak_ | kde is more granular | 21:05 |
| DrMax | yes, you have the enable check box, and if you check it, then you *should* have a choice, but it's RGB and slight and that's it. | 21:06 |
| cbreak_ | change it to none. | 21:06 |
| DrMax | then I'm back to 1995 with le big pixels like grandma use to make | 21:06 |
| cbreak_ | why? | 21:06 |
| cbreak_ | it is physically _impossible_ to get sub-pixel rendering without rendering with sub-pixels (= individual colors) | 21:07 |
| cbreak_ | since you don't want that, turn it off. | 21:07 |
| DrMax | because that's how it behaves? If you disable antialiasing, it renders pixels that are either 100% on or 100% off | 21:07 |
| cbreak_ | easy. | 21:07 |
| DrMax | OK, again. | 21:07 |
| cbreak_ | I'm not talking about anti-aliasing. I'm talking about sub-pixel rendering | 21:07 |
| DrMax | open systemsettings if you have it on your system | 21:08 |
| DrMax | Enabling antialiasing enables automatically subpixel rendering for fonts | 21:08 |
| cbreak_ | so turn it off. easy. | 21:08 |
| cbreak_ | it has its own pull-down menu | 21:08 |
| DrMax | I'm not saying it makes sense, I'm saying that what's the dialog does | 21:08 |
| DrMax | OK, turn it off. Tell me how the fonts look. | 21:09 |
| cbreak_ | https://imgur.com/a/Qa18kkG | 21:10 |
| cbreak_ | looks totally fine. | 21:10 |
| DrMax | it doesn't let me chose "none" | 21:11 |
| cbreak_ | maybe you're on some older version of KDE. | 21:11 |
| JanC | huh? | 21:11 |
| DrMax | In my fonts.conf, it complains about "grayscale" is invalid constant | 21:12 |
| JanC | there should be a way to turn off subpixel rendering, as otherwise what do you do on screens that don't have subpixels? | 21:12 |
| DrMax | if you can, could you tell me what your fonts.conf says for option "none" ? | 21:12 |
| cbreak_ | grayscale makes no sense at all for subpixel rendering | 21:12 |
| cbreak_ | which fonts.conf? The system one? I never touched that one. | 21:13 |
| DrMax | the one in .config/fontconfig/ | 21:13 |
| DrMax | well ~/.config/fontconfig | 21:14 |
| cbreak_ | I doubt it's relevant, but it says this: https://gist.github.com/cbreak-black/288932ebb4d31f1413722e3b696d7b59 | 21:15 |
| DrMax | (I understand the difference between rgb subpixel rendeing and just antialiasing... they're usually conflapulated in the same dialog) | 21:15 |
| DrMax | mine complains about "grayscale" not being valid, despite... well, it generated it? | 21:16 |
| JanC | sounds like a bug somewhere then? :) | 21:17 |
| cbreak_ | I don't see how it'd generate it, there's obviously no option for greyscale subpixel rendering, since that makes no sense | 21:17 |
| cbreak_ | maybe it's for something else | 21:17 |
| DrMax | I generated the fontconfig from qt5ct | 21:18 |
| DrMax | but that was a mistake | 21:18 |
| DrMax | thank you, you've been very helpful | 21:18 |
| cbreak_ | newer KDE like mine use Qt6, so you're maybe just on some old version | 21:18 |
| DrMax | I have a fresh install of "early this morning" | 21:19 |
| cbreak_ | weird... | 21:19 |
| DrMax | Now, if I could get Okular to show icons... | 21:19 |
| cbreak_ | shows icons for me in the toolbar. | 21:22 |
| DrMax | ...but not for me. | 21:34 |
| DrMax | I choose "icon only" and... I get text only | 21:35 |
| cbreak_ | maybe you use an icon set that doesn't have the required icons | 21:45 |
| DrMax | that's what I thought, but I have a set with a zillion things in it | 21:51 |
| DrMax | what are you using? | 21:51 |
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| cbreak_ | BreezeDark or BeautyLineSimple | 22:01 |
| DrMax | hmm | 22:15 |
| DrMax | apparently I must have export QT_QPA_PLATFORMTHEME=qt6ct somewhere for the Icons to show. | 22:16 |
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