[regression] ubuntu-emulator fails to start Mir demos

[Gerry Boland]

On the emulator, many Mir clients are failing to start, with errors ranging from

$ mir_demo_client_egltriangle
No active outputs found.

$ mir_demo_client_eglsquare
error : could not determine display size

$ QT_QPA_PLATFORM=ubuntumirclient qmlscene test.qml
Loading module: 'libubuntu_application_api_touch_mirclient.so.3.0.0'
ASSERT: "displayOutput != nullptr" in file ../../../src/ubuntumirclient/screen.cpp, line 183

These all suggest the display configuration reported to clients is not correct. Checking this:

$ mirout
Connected to server: <default>
Card 0: Max 2 simultaneous outputs
Output 0: Card 0, LVDS, connected, 480x800+0+0, unused, on, 0mm x 0mm (0.0"), normal
     480x800 60.00*+
Output 0: Card 0, LVDS, connected, 480x800+0+0, unused, off, 0mm x 0mm (0.0"), normal
     480x800 60.00*+

which indicates there are no "used" outputs (also the 2 "Output 0" entries is suspicious)

To bring up emulator, do:
sudo ubuntu-emulator create touch --channel=ubuntu-touch/rc-proposed/ubuntu
ubuntu-emulator run touch
and you can connect into is via adb.

[Daniel van Vugt (vanvugt)]

Fix committed to lp:mir/0.14 at revisision 2724. Scheduled for release in Mir 0.14.1.

[Daniel van Vugt (vanvugt)]

Seems to be a regression, but not a regression in Mir. The code that was removed has been there for what looks like years. So the emulator itself has somehow regressed.

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 0.16.0

[Alexandros Frantzis (afrantzis)]

> Seems to be a regression, but not a regression in Mir. The code that was removed has been there for what looks like years. So the emulator itself has somehow regressed.

There are two parts to the failure:

1. The display configuration reported by Mir is incorrect, which is clearly a Mir problem. The MP fixed this.
2. Failure to find a proper EGL config when EGL_COLOR_BUFFER_TYPE is specified, which is indeed an emulator bug. The MP provides a harmless workaround in Mir (i.e. EGL_RGB_BUFFER is the default, so we don't need to explicitly specify it) to unblock OTA6.

[Daniel van Vugt (vanvugt)]

Please keep that tag. I use it for periodic quality analysis.