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[Steven Wilson <864155@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

CPU/GPU: AMD A8-3850 w/onboard GPU ("Radeon 6550D" according to AMD marketing; "Device 9640" according to lspci)
Mainboard: Asus F1A75-V PRO
Monitor (TV): Sony KDL46EX701

Ubuntu version: 11.10 Beta 2 amd64
xserver-xorg-video-ati version: 1:6.14.99~git20110811.g93fc084-0ubuntu1

My system is connected to a 1920x1080 LCD TV via an HDMI cable. No other
video cable is connected. Despite this, the driver says:

[    19.096] (II) RADEON(0): Output VGA-0 connected
[    19.096] (II) RADEON(0): Output HDMI-0 connected
[    19.096] (II) RADEON(0): Output DisplayPort-0 disconnected
[    19.096] (II) RADEON(0): Using fuzzy aspect match for initial modes
[    19.096] (II) RADEON(0): Output VGA-0 using initial mode 1024x768
[    19.096] (II) RADEON(0): Output HDMI-0 using initial mode 1024x768

By default, this results in a 1024x768 desktop being mirrored across the
TV and the "Unknown" VGA monitor. I can change this in "Displays" and
get a sane configuration, but that only takes effect after logging in;
the login screen goes back to 1024x768.

The kernel correctly detects that only the HDMI output is connected, and
I get the expected full-screen 1920x1080 display if I switch to a
terminal with Ctrl+Alt+F1:

[    7.144058] [drm] Radeon display connector VGA-1: No monitor connected or invalid EDID
[    7.247568] [drm] Radeon display connector HDMI-A-1: Found valid EDID
[    7.724031] [drm] Radeon display connector DP-1: No monitor connected or invalid EDID

Launchpad bug #151790 / Freedesktop bug #18719 describes a similar
problem, but I'm filing a new bug since that one is almost 3 years old
and its fix seems to be tied to a specific hardware quirk in an older
hardware family.

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/864155

Title:
  Nonexistent VGA monitor detected on AMD A8-3850 / Asus F1A75-V PRO

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