Nonexistent VGA monitor detected on AMD A8-3850 / Asus F1A75-V PRO
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
xserver-xorg-video-ati (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
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-
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.
Changed in xserver-xorg-video-ati (Ubuntu): | |
status: | Incomplete → Confirmed |
Changed in xserver-xorg-video-ati (Ubuntu): | |
status: | Confirmed → Fix Released |
If this is still occurring on the final release of Oneiric, please run apport-collect 864155