Comment 28 for bug 1958591

I am also affected by this bug on my Lenovo laptop

I have an external monitor plugged in all the time, that means after the display manager starts, the internal monitor is unusable (showing "snow" and lines).

fixed this temporarily by booting 5.11 kernel instead of 5.13

*-display
       description: VGA compatible controller
       product: Renoir
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:07:00.0
       logical name: /dev/fb0
       version: d1
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix vga_controller bus_master cap_list fb
       configuration: depth=32 driver=amdgpu latency=0 mode=1920x1080 visual=truecolor xres=1920 yres=1080
       resources: iomemory:40-3f iomemory:40-3f irq:87 memory:460000000-46fffffff memory:470000000-4701fffff ioport:1000(size=256) memory:fd300000-fd37ffff