Distorted image after upgrade to 5.11 (eglfs + webview)

[wojtekzin]

Hi,

We are getting weird distorted image after upgrade to 5.11.

Version 5.10 works well tho.

QT output

15:21:53.469 [debug] qt.qpa.egldeviceintegration: EGL device integration plugin keys: ("eglfs_emu", "eglfs_kms_egldevice", "eglfs_kms", "eglfs_x11")
15:21:53.469 [debug] qt.qpa.egldeviceintegration: Trying to load device EGL integration "eglfs_kms"

15:21:53.469 [debug] qt.qpa.eglfs.kms: New DRM/KMS via GBM integration created

15:21:53.469 [debug] qt.qpa.egldeviceintegration: Using EGL device integration "eglfs_kms"

15:21:53.469 [debug] qt.qpa.eglfs.kms: platformInit: Opening DRM device

15:21:53.469 [debug] qt.qpa.input: udev device discovery for type QFlags<QDeviceDiscovery::QDeviceType>(Device_DRM|Device_VideoMask)

15:21:53.470 [debug] qt.qpa.input: Found matching devices ("/dev/dri/card0")

15:21:53.470 [debug] qt.qpa.eglfs.kms: Found the following video devices: ("/dev/dri/card0")

15:21:53.470 [debug] qt.qpa.eglfs.kms: Using "/dev/dri/card0"

15:21:53.470 [debug] qt.qpa.eglfs.kms: Using backend-provided DRM device /dev/dri/card0
15:21:53.517 [debug] qt.qpa.eglfs.kms: Querying EGLDisplay

15:21:53.517 [debug] qt.qpa.eglfs.kms: Found 10 planes

15:21:53.517 [debug] qt.qpa.eglfs.kms: plane 0: id = 37 countFormats = 10 possibleCrtcs = 0x10 supported formats = RG24 XR24 AR24 RA24 XR30 XB30 AR30 AB30 XB24 AB24
[...]
15:21:53.518 [debug] qt.qpa.eglfs.kms: "DP1" mode count: 24 crtc index: 0 crtc id: 43
15:21:53.518 [debug] qt.qpa.eglfs.kms: Selected mode 0 : 1920 x 1080 @ 60 hz for output "DP1"

15:21:53.518 [debug] qt.qpa.eglfs.kms: Physical size is QSizeF(480, 270) mm for output "DP1"

15:21:53.518 [debug] qt.qpa.eglfs.kms: Output DP1 can use 2 planes: 41 42

15:21:53.518 [debug] qt.qpa.eglfs.kms: EDID data for output "DP1": identifier 'MHS', manufacturer 'MHS', model 'MH-FHD    ', serial '1312962608', physical size: 480.00x270.00

15:21:53.518 [debug] qt.qpa.eglfs.kms: Creating new global GBM mouse cursor

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