btw, would be helpful to see if installing linux-image-hwe-edge together
with the bad mesa would still work.. so, ppa-purge the ppa, then install
the edge kernel, reboot

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https://bugs.launchpad.net/bugs/1836721

Title:
  Black screen after updating mesa from 18.2 to 19.0 on i386 Ubuntu
  18.04

Status in mesa package in Ubuntu:
  Won't Fix
Status in mesa source package in Bionic:
  Fix Committed

Bug description:
  Black screen after updating mesa from 18.2 to 19.0 on i386 Ubuntu
  18.04.

  ~# lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 18.04.2 LTS
  Release:      18.04
  Codename:     bionic

  ~# uname -a
  Linux WS 4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:12 UTC 2019 i686 
i686 i686 GNU/Linux

  ~# lspci -nn -k -d ::0300
  00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:3e90]
        Subsystem: ASUSTeK Computer Inc. Device [1043:8694]
        Kernel driver in use: i915
        Kernel modules: i915

  mesa: 19.0.2-1ubuntu1.1~18.04.1

  X crashes with message:
   i965: Failed to submit batchbuffer: Invalid argument

  The same issue was after updating mesa from 18.0 to 18.2:
  https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1815172

  I have tried the same fix and it works for me:
  
https://launchpadlibrarian.net/410418147/mesa_18.2.8-0ubuntu0~18.10.1_18.2.8-0ubuntu0~18.10.2.diff.gz

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