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failure of gdm3 only happens with vc4.ko
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README.md

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@@ -34,7 +34,7 @@ Hardware clock can be corrected by `sntp -S pool.ntp.org` as root.
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# Comments on Linux 5.10 and Rapsberry Pi 4 (as of January 2021)
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* `drivers/gpu/drm/vc4.ko` enables 4K resolution and DRI/DRM. 4K resolution can be enabled without `vc4.ko` on RPi4 if `hdmi_enable_4kp60=1` is included in `config.txt`.
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* But [vc4.ko sometimes garbles display output](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980785). `disable_fw_kms_setup=1` in `config.txt` often supress this symptom. If `disable_fw_kms_setup=1` does not help, patched kernel package is available at http://153.240.174.134:64193/kernel-deb-5.9/ **The patch was included at Linux 5.10.13**.
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* [`gdm3` display manager and gnome session fail because of insufficient CMA](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980536). Adding `cma=192M@256M` to `cmdline.txt` fixes this symptom.
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* [`gdm3` display manager and gnome session fail with vc4.ko because of insufficient CMA](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980536). Adding `cma=192M@256M` to `cmdline.txt` fixes this symptom.
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* ~~[Boot from USB is impossible](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977694) unlike Linux 5.9. Kernel package capable of USB boot is available at http://153.240.174.134:64193/kernel-deb-5.9/~~
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* WiFi at 5GHz is sometimes blocked by the vc4.ko and high resolution display. `module_blacklist=vc4` in `cmdline.txt` and `hdmi_enable_4kp60=1` could enable both 5GHz WiFi and high resulution simultaneously.
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* Kernel package in the above URL is built by `build-raspi4-kernel.sh` in this directory.

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