Black screen on boot on Lenovo S345 Chromebook (GRUNT/LIARA)

[eugeniodepalo]

I've tried booting from USB with all the distros (Ubuntu, Fedora and Arch) and they all get me a black screen that never goes away (tried waiting more than 10 mins).

This is the output of journalctl --file=/mnt/chromeos/USB Drive/var/log/journal/*/*.journal | grep amdgpu after trying to boot from the USB:

Jul 22 05:42:35 chromebook kernel: [drm] amdgpu kernel modesetting enabled.
Jul 22 05:42:35 chromebook kernel: pci 0000:00:01.0: attach allowed to drvr amdgpu [internal device]
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: vgaarb: deactivate vga console
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: amdgpu: Trusted Memory Zone (TMZ) feature not supported
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: amdgpu: Fetched VBIOS from VFCT
Jul 22 05:42:35 chromebook kernel: amdgpu: ATOM BIOS: SWBRT39865.001
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: amdgpu: VRAM: 16M 0x000000F400000000 - 0x000000F400FFFFFF (16M used)
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: amdgpu: GART: 1024M 0x000000FF00000000 - 0x000000FF3FFFFFFF
Jul 22 05:42:35 chromebook kernel: [drm] amdgpu: 16M of VRAM memory ready
Jul 22 05:42:35 chromebook kernel: [drm] amdgpu: 2906M of GTT memory ready.
Jul 22 05:42:35 chromebook kernel: amdgpu: hwmgr_sw_init smu backed is smu8_smu
Jul 22 05:42:35 chromebook kernel: amdgpu: smu version 33.09.00
Jul 22 05:42:35 chromebook kernel: Modules linked in: amdgpu(+) btusb btrtl btbcm btintel snd_hda_codec_hdmi bluetooth ath10k_pci ath10k_core snd_hda_intel ecdh_generic snd_intel_dspcfg ecc crc32c_intel snd_hda_codec joydev drm_ttm_helper snd_hwdep ath gpu_sched i2c_piix4 acpi_als snd_hda_core industrialio_triggered_buffer kfifo_buf industrialio snd_soc_adau7002 snd_soc_acp_rt5682_mach snd_soc_max98357a snd_soc_acp_da7219mx98357_mach snd_soc_da7219 acp_audio_dma vfat fat nls_cp437 nls_iso8859_1 uvcvideo videobuf2_vmalloc iwlmvm dm_multipath iwlwifi fuse
Jul 22 05:42:35 chromebook kernel:  acp_genpd_add_device+0x18/0x30 [amdgpu]
Jul 22 05:42:35 chromebook kernel:  ? acp_genpd_remove_device+0x20/0x20 [amdgpu]
Jul 22 05:42:35 chromebook kernel:  acp_hw_init+0x4e1/0x6d0 [amdgpu]
Jul 22 05:42:35 chromebook kernel:  amdgpu_device_init.cold+0xc93/0x166b [amdgpu]
Jul 22 05:42:35 chromebook kernel:  amdgpu_driver_load_kms+0x5b/0x290 [amdgpu]
Jul 22 05:42:35 chromebook kernel:  amdgpu_pci_probe+0xcd/0x160 [amdgpu]
Jul 22 05:42:35 chromebook kernel: amdgpu 0000:00:01.0: amdgpu: SE 1, SH per SE 1, CU per SH 3, active_cu_number 3
Jul 22 05:42:35 chromebook kernel: amdgpu: failed to allocate framebuffer (2211840)
Jul 22 05:42:35 chromebook kernel: [drm:amdgpufb_create [amdgpu]] *ERROR* failed to create fbcon object -12
Jul 22 05:42:35 chromebook kernel: [drm] Initialized amdgpu 3.42.0 20150101 for 0000:00:01.0 on minor 1
Jul 22 05:42:36 chromebook systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl1...
Jul 22 05:42:36 chromebook systemd[1]: Finished Load/Save Screen Backlight Brightness of backlight:amdgpu_bl1.
Jul 22 05:43:22 chromebook systemd[1]: Stopping Load/Save Screen Backlight Brightness of backlight:amdgpu_bl1...
Jul 22 05:43:22 chromebook systemd[1]: systemd-backlight@backlight:amdgpu_bl1.service: Deactivated successfully.
Jul 22 05:43:22 chromebook systemd[1]: Stopped Load/Save Screen Backlight Brightness of backlight:amdgpu_bl1.

Full dmesg output (from /var/log/dmesg in the USB stick):
https://gist.github.com/eugeniodepalo/ef403da6f0902e086ebfa9b841c9d738

Lastly, for comparison, here is the output of sudo dmesg -k run from the cros shell:
https://gist.github.com/eugeniodepalo/cd841ddffc391921a8fd3f1ee71554cd