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scmarko avatar Ubuntu

Display problems with Lubuntu 22.04 and Intel UHD Graphics 600

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scmarko

I have two touchscreen tablet computers where I have installed Lubuntu 22.04. There are problems with the displays when Linux starts:

  1. First computer has black screen once desktop has been loaded. I can login using SSH and TeamViewer on the computer. After a while, the screen starts filling with vertical colors.

  2. On the other computer, the screen has flickering / glitches almost all the time.

The native resolution for both tablet computers is 2160x1440 pixels. But if I start the machines using e.g. 1024x768 resolution and then change to 2160x1440 resolution, then there aren't any problems with the displays.

Or if I turn off the screen first using xrandr --output eDP-1 --off and then back on using xrandr --output eDP-1 --mode 2160x1440 then I get it working.

Also if using "nomodeset" kernel parameter, then there are no problems with the displays, except that xrandr doesn't work and I can't adjust backlight after that.

Output from one computer using lspci -vnn:

00:02.0 VGA compatible controller [0300]: Intel Corporation GeminiLake [UHD Graphics 600] [8086:3185] (rev 06) (prog-if 00 [VGA controller])
    DeviceName: Onboard - Video
    Subsystem: Intel Corporation GeminiLake [UHD Graphics 600] [8086:2212]
    Flags: bus master, fast devsel, latency 0, IRQ 130
    Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
    Memory at 90000000 (64-bit, prefetchable) [size=256M]
    I/O ports at f000 [size=64]
    Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
    Capabilities: [40] Vendor Specific Information: Len=0c <?>
    Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
    Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 2
    Capabilities: [100] Process Address Space ID (PASID)

The image of the problem can be seen here: https://ibb.co/1rRqdnk

When checking EDID using get-edid I get the following:

Section "Monitor"
    Identifier ""
    ModelName ""
    VendorName "WST"
    # Monitor Manufactured week 5 of 2016
    # EDID version 1.4
    # Digital Display
    DisplaySize 250 170
    Gamma 2.20
    Option "DPMS" "false"
    Modeline    "Mode 0" 218.80 2160 2210 2250 2430 1440 1442 1444 1500 -hsync -vsync 
EndSection

I have tried almost anything and can't understand where the problem is.

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David avatar
cn flag
David
Nomodeset tells the OS not to use the video driver. That is causing issues of its own. If nomodeset makes the issues go away on startup it is a driver issue.
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