Bug#928631: firmware-amd-graphics: Update to 20190502-1 causus hang of system directly after grub

[Diederik de Haas <didi.debian@cknow.org>]

On dinsdag 21 mei 2019 19:24:07 CEST Romain Perier wrote:
> Hi,

Hi,

> firmware-amd-graphics 20190502-1 is based onto upstream commit
> 92e17d0dd2437140fab044ae62baf69b35d7d1fa, that is commit "amdgpu: update
> vega20 to the latest 19.10 firmware" . Two commits behind there is commit
> "amdgpu: update vega10 to the latest 19.10 firmware", that is already
> included in firmware-amd-graphics 20190502-1.
> 
> Could you try to revert "amdgpu: update vega10 to the latest 19.10
> firmware" ? So try to use the firmware for vega10 that is before this
> commit. Does it work for you ?
> 
> 1. Use linux-firmware.git with last HEAD in the master branch
> 2. git checkout 4ea5c73b96ed4a508f90047e22ccbaa477481310 (commit "amdgpu:
> update polaris11 to the latest 19.10 firmware", that is the commit before
> bumping vega10 to 19.10) 3. Copy vega10 binary blobs to
> /lib/firmware/amdgpu
> 
> Does it work ?

Yes, that does work.
What did surprise me is that I saw a blinking cursor, which I don't see with 
firmware-amd-graphics version 20190114-1.
$ git log --oneline -- amdgpu/vega10_ce.bin
0f22c85 Revert "amdgpu: update vega10 fw for 18.50 release"
ec4b0cd amdgpu: update vega10 fw for 18.50 release
ac5f8bd amdgpu: update vega10 firmware to 18.40
10e2971 amdgpu: sync up vega10 firmware with 18.20 release
0d672f7 amdgpu: sync up vega10 firmware with 18.10 release
f0698be amdgpu: add initial vega10 firmware

This tells me I'm running actually running "ac5f8bd amdgpu: update vega10 
firmware to 18.40"
https://tracker.debian.org/news/1021249/accepted-firmware-nonfree-20190114-1-source-into-unstable/ contains:
- amd-graphics:
       + "Polaris10", "Polaris11", "Raven" firmware updates to sync with
         18.50 release
       + "Fiji", "Tonga", "Vega10", "Carrizo" firmware updates to sync with
         18.40 release

So in both cases I'm supposed to run the exact same firmware version, so even 
the minor change in behavior (blinking cursor) surprises me.

What was the reason for the test?
Checking 'git log' for that specific file before I did the test made me conclude 
it wouldn't make a difference with packaged version 20190114-1 (but did the 
test anyway as requested).

Cheers,
  Diederik

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