| Summary: | Dual DisplayPort monitors (tiled, MST, e.g. 5k) are not supported by KWin | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Andrej Podzimek <andrej> |
| Component: | platform-drm | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | CONFIRMED --- | ||
| Severity: | normal | CC: | andrej, asturm, d82ks8djf82msd83hf8sc02lqb5gh5, dmitry.myachin, frenzybiscuit, johan.toft, joost, kdedev, nate, postix, tyler, wheel, xaver.hugl |
| Priority: | NOR | Keywords: | wayland-only |
| Version First Reported In: | 6.2.5 | Flags: | vlad.zahorodnii:
Wayland+
vlad.zahorodnii: X11- |
| Target Milestone: | --- | ||
| Platform: | unspecified | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: |
Two 5k HP monitors (2 tiles each, quad 2560x2880 altogether) shown in Systemsettings
Current status of 5k monitors drm_info of HP all-in-one concerned |
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Description
Andrej Podzimek
2020-10-11 14:12:08 UTC
Yes, kwin doesn't support tiled monitors yet. Regarding the issues you mentioned. (1) it should be fixed in 5.20 (2) windows have their geometry in device independent pixels (3) if you maximize a window, it will be constrained to only one monitor. In order to make a window cover several monitors, you need to set the geometry Even on 5.21 I still have no clue how to make this work. The problem with setting the geometry is that windows don't seem to get maximized "for real" (i.e. they keep their margins / decorations etc.) and full-screen video is not treated nicely either. For reference: https://bugreports.qt.io/plugins/servlet/mobile#issue/QTBUG-65457 The recent Qt changes linked from the bug might be (very distantly) relevant for this issue. (But this is likely not something that could be magically solved by Qt alone.) It seems like the BUG keyword didn't work for some reason. Nothing in Qt or anything like that is involved; here's the MR: https://invent.kde.org/plasma/kwin/-/merge_requests/1174 I'll rebase it later today so that it can be tested; it may be too late for 5.23 though *** Bug 435631 has been marked as a duplicate of this bug. *** Is this going to get fixed? Currently on Gentoo with KDE 6.1.4 there are still issues supporting monitors such as the LG 5k. It defaults to a 4k resolution (with another 2k beside it that isn't visible on the monitor). If I set them both to the same default 2k resolution (or w/e the default is) the display works, but KDE panels are only on the left side. In addition, when there is a window between the two monitors, one side is higher than the other, despite the displays being lined up in the display area. For comparison gnome handles this perfectly, the monitor is shown as one monitor and everything just works. I.... really would prefer to not use gnome. Thanks! Yes, this is still planned. Fixing it just requires a lot of changes in KWin. Any updates? This kind of works on KDE wayland but two issues: A) Games don't have correct resolutions listed. B) The middle tears when moving windows/watching videos/playing games. Created attachment 174377 [details]
Current status of 5k monitors
Hi! For anyone currently using the LG 5K monitor specifically. With fractional scaling at 125%-150% you can disable one of the input signals and use full 4k on the other. Yeah, it's not 5k. But it still looks good. Fingers crossed this will be added to KDE at some point soon.. I'm going to make an assumption that the reason this hasn't been fixed is the developers simply do not have the hardware. Is there anything needed from us to debug this issue? Thank you! I have same issue: https://discuss.kde.org/t/two-displays-one-screen/30989 Created attachment 179103 [details] drm_info of HP all-in-one concerned From https://discuss.kde.org/t/two-displays-one-screen/30989/4?u=meven |