Black borders after removing secondary screen

Support Graphics & Display
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1

After removing secondary screen from hdmi, kde is now displaying black bars on top and bottom.

The problem happens after I login on a wayland session, if I log into xorg then it display correctly.

SGCAM_20240719_134552993
SGCAM_20240719_1345529931920×1080 196 KB

Inxi output

System:
  Kernel: 6.6.40-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 14.1.1
  Desktop: KDE Plasma v: 6.0.5 Distro: Manjaro base: Arch Linux
Machine:
  Type: Portable System: Dell product: Inspiron 1525 v: N/A
    serial: <superuser required>
  Mobo: Dell model: N/A serial: <superuser required> BIOS: Dell v: A17
    date: 10/27/2009
Battery:
  ID-1: BAT0 charge: 5.6 Wh (100.0%) condition: 5.6/48.8 Wh (11.5%)
    volts: 12.3 min: 11.1 model: DELL 00 status: full
CPU:
  Info: dual core model: Intel Core2 Duo T6400 bits: 64 type: MCP arch: Penryn
    rev: A cache: L1: 128 KiB L2: 2 MiB
  Speed (MHz): avg: 1197 min/max: 1200/2000 cores: 1: 1197 2: 1197
    bogomips: 7982
  Flags: ht lm nx pae sse sse2 sse3 sse4_1 ssse3
Graphics:
  Device-1: Intel Mobile GM965/GL960 Integrated Graphics
    vendor: Dell Inspiron 1525 driver: i915 v: kernel arch: Gen-4
    bus-ID: 00:02.0
  Display: wayland server: X.org v: 1.21.1.13 with: Xwayland v: 24.1.1
    compositor: kwin_wayland driver: X: loaded: modesetting dri: crocus
    gpu: i915 resolution: 1280x720
  API: EGL v: 1.5 drivers: crocus,swrast platforms:
    active: wayland,x11,surfaceless,device inactive: gbm
  API: OpenGL v: 4.5 compat-v: 2.1 vendor: intel mesa v: 24.1.3-manjaro1.1
    glx-v: 1.4 direct-render: yes renderer: Mesa Intel 965GM (CL)
  API: Vulkan Message: No Vulkan data available.
Audio:
  Device-1: Intel 82801H HD Audio vendor: Dell Inspiron 1525
    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0
  API: ALSA v: k6.6.40-1-MANJARO status: kernel-api
  Server-1: PipeWire v: 1.2.1 status: active
Network:
  Device-1: Marvell 88E8040 PCI-E Fast Ethernet vendor: Dell Inspiron 1525
    driver: sky2 v: 1.30 port: de00 bus-ID: 09:00.0
  IF: enp9s0 state: up speed: 100 Mbps duplex: full mac: <filter>
  Device-2: Broadcom BCM4321 802.11a/b/g/n vendor: Dell Wireless 1500 Draft
    802.11n WLAN Mini-card driver: wl v: kernel bus-ID: 0b:00.0
  IF: wlp11s0 state: dormant mac: <filter>
Drives:
  Local Storage: total: 111.79 GiB used: 72.14 GiB (64.5%)
  ID-1: /dev/sda vendor: Kingston model: SA400S37120G size: 111.79 GiB
Partition:
  ID-1: / size: 101.21 GiB used: 72.14 GiB (71.3%) fs: ext4 dev: /dev/sda1
Swap:
  ID-1: swap-1 type: partition size: 8.4 GiB used: 0 KiB (0.0%) dev: /dev/sda2
Sensors:
  System Temperatures: cpu: 52.0 C mobo: N/A
  Fan Speeds (rpm): cpu: 0 fan-2: 0 fan-3: 0
Info:
  Memory: total: 4 GiB available: 3.82 GiB used: 1.26 GiB (32.9%)
  Processes: 158 Uptime: 37m Init: systemd
  Packages: 1386 Compilers: clang: 18.1.8 gcc: 14.1.1 Shell: Zsh v: 5.9
    inxi: 3.3.35
2

Not seen that before myself, but one idea: do you have screen scaling set in Wayland? …also, do you span the displays, or mirror them? (I suspect the former, which shouldn’t be an issue).

(Turns out I have the same machine, but mine has been out of use for a while and I removed the display anyway, as the interconnect had gone bad, so can’t compare).

3

I first choose to mirror by mistake, then I change in the settings to extend the screen. Now even without no screens connected, it still displays the bars like it’s using a wrong resolution.

4

Have you tried one of the other LTS Kernels? These machines are about 15 years old now; maybe you’ll have better luck with 6.1 or one from the 5.x series?

Also, does it fill the screen on other resolutions? (I suspect what’s happening here is it’s being scaled at 16:9 instead of 16:10).

5

It only offers
-1280x720 (16:9) (that’s what I’m using)
-1280x800 (16:10) (only a black screen with that option)
-1024x768 (4:3) (thos one get rid of the botton and top borders, but put borders in the left and right)

The issue seems as the 1280x720 resolution is considering as if the screen was smaller.

I’ll probably migrate to Gnome if it comes to that.

6

I guess it’s worth testing this from a Live session (and also with KDE, using the latest .ISO).

It’s easy enough to swap kernels though. :wink:

I’d say that 1280x800 is what is needed … perhaps it will, with a different kernel.

1 Like
7

So this is what I did, plugged again a second screen then change the notebook screen to 1280x800. Now it’s working correctly.

This isn’t a kernel issue, it’s something with how kde fallback the configuration after removing second screen.

Anyway it’s working now. Thanks for your help.

1 Like
8

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