Dear ethan.hsieh Thanks for reply. My kernel is 5.15.0-1029.33. I will try to update kernel to latest version. I check the kernel log, it can detect HDMI plugin and send notify to framework. The HDMI monitor can display right timing but black screen. It seems Weston don't handle the plugin event.
root@mtk-genio:/home/ubuntu# dmesg [ 57.188220] mediatek-drm-hdmi 1c300000.hdmi: hpd:0 [ 57.236232] mediatek-drm-hdmi 1c300000.hdmi: hpd:1 [ 57.236272] mediatek-drm-hdmi 1c300000.hdmi: Hot Plug State Change! old:0, new:1 [ 57.338143] mediatek-hdmi-phy 11d5f000.hdmi-phy: tmds_high_bit_clk_ratio enabled:0 [ 57.338233] mediatek-drm-hdmi 1c300000.hdmi: is_over_340M:0 [ 57.343862] mediatek-hdmi-mt8195-ddc ddc-i2c: ddc failed! : 0 [ 57.343878] mediatek-drm-hdmi 1c300000.hdmi: set_scrambling:0 [ 57.349416] mediatek-hdmi-mt8195-ddc ddc-i2c: ddc failed! : 0 [ 57.349433] mediatek-drm-hdmi 1c300000.hdmi: set_high_tmds_clock_ratio:0 [ 57.349536] mediatek-hdmi-phy 11d5f000.hdmi-phy: tmds_high_bit_clk_ratio enabled:0 [ 57.366932] Console: switching to colour frame buffer device 240x67 [ 57.398344] mediatek-drm mediatek-drm.4.auto: [drm] fb0: mediatekdrmfb frame buffer device [ 57.467986] mediatek-drm-hdmi 1c300000.hdmi: hpd:1 BR Sam -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2044664 Title: HDMI plugin after boot, but display can't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/2044664/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
