Bug#951462: pcsx2: Extremely slow render in both hardware and software rendering mode. Is a bug, have a fix.

[J. McMaster]

Package: pcsx2
Version: 1.5.0~gfc1d9aef0+dfsg-1
Severity: important

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
        Normal usage, beyond firmware dump (i.e. a game itself, post-boot)

   * What exactly did you do (or not do) that was effective (or
     ineffective)?
        FAIL: Initially tried changing from HW to SW render (eliminates GPU)
        FAIL: Disable/enable XFCE compositor and options.
        SUCCESS: Rolled back to version 1.4

   * What was the outcome of this action?
        Worked perfectly. Complete success.
        Also fixes bug #864008 on my system.

   * What outcome did you expect instead?
        N/A

   * Bug recreation, and bug fix:
        0) Foreword: You will have to play enough of a game to use the
           game engine's PS2 hardware render capabilities. It is highly
           recommended that Tekken 4 or a similar "engin-ed" game be used.
           Finally, a testing machine should be >= mine: Ryzen 3600X CPU,
           2x4GB DC memory clocked at 2666Mhz, AMD RX460 2GB video card.
        1) Install pcsx2 1.5 on a regular Debian 10.x AMD64 system.
        2) Try to run the game (see notes at point 0) through until the actual
           realt-time 3D rendering begins as pre-rendered FMVs, and 2D planes
           don't not produce this bug very vissibly (if at all).
        3) After exhausting settings/fiddling: Bug has been recreated.
        4) Purge the package pcsx2 1.5.x, NOT its dependencies.
        5) Download the 1.4.x deb package from 9 ("Stretch").
        6) Install pcsx 1.4 deb with dpkg (deps from 1.5 work)*
        7) Ensure all settings are at stock. You may need software rendering
           for Tekken 4 and similar.
        8) Run PCSX2 with your game. It should now run at 100% FPS.
           Bug #864008 is _also_ fixed by this method.

   * Final notes
        Please roll back to the 1.4 branch of PCSX2. The developers' last
        "Release" pre-compiled binary is 1.4. Even Arch/Manjaro, known for
        being "Bleeding Edge" use the 1.4 version. Clearly 1.5 is buggy, at
        least on GNU/Linux.
        Though PCSX2 is supposedly "cross-platform", I see a lot more
        development and patching for M$ Windows, likely because the audience
        is bigger, giving them more testers and a larger target "market".
        As of writing, version 1.4 shares the exact same deps as 1.5.

-- System Information:
Debian Release: 10.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-8-amd64 (SMP w/12 CPU cores)
Kernel taint flags: TAINT_WARN
Locale: LANG=en_ZA.UTF-8, LC_CTYPE=en_ZA.UTF-8 (charmap=UTF-8), LANGUAGE=en_ZA:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages pcsx2 depends on:
ii  libaio1             0.3.112-3
ii  libasound2          1.1.8-1
ii  libc6               2.28-10
ii  libgcc1             1:8.3.0-6
ii  libgdk-pixbuf2.0-0  2.38.1+dfsg-1
ii  libgl1              1.1.0-1
ii  libglib2.0-0        2.58.3-2+deb10u2
ii  libgtk2.0-0         2.24.32-3
ii  liblzma5            5.2.4-1
ii  libpng16-16         1.6.36-6
ii  libportaudio2       19.6.0-1
ii  libsdl2-2.0-0       2.0.9+dfsg1-1
ii  libsoundtouch1      2.1.2+ds1-1
ii  libstdc++6          8.3.0-6
ii  libwxbase3.0-0v5    3.0.4+dfsg-8
ii  libwxgtk3.0-0v5     3.0.4+dfsg-8
ii  libx11-6            2:1.6.7-1
ii  zlib1g              1:1.2.11.dfsg-1

Versions of packages pcsx2 recommends:
ii  libasound2-plugins  1.1.8-1
ii  libc6 [libc6-i686]  2.28-10

pcsx2 suggests no packages.

-- no debconf information