Public bug reported:
package designation may be wrong, i only know the symptoms, and now
luckily the workaround, this is my best guess
I have a dual monitor setup, with 2 crt monitors, an ATI X1950AGP video card,
Xubuntu 12.04
the problem was that after after a successful login instead of getting the
desktop screen i got black screen, no video signal on any of the video monitors
i could press CTRL-ALT-F1 log in to tty, and look for logs,
-> [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
this was in the syslog, so i was looking for video card and drm errors,
meanwhile installed fglrx, then uninstalled it, play with package downgrades etc
rarely from the planty of tries and restarts the machine gave me the
desktop, i didn't understood why, but saved the logs from this, so i
could compare with the logs that don't work
here is the good one, from Xorg.0.log
[ 12.700] (II) RADEON(0): Modeline "720x400"x70.1 28.32 720 738 846 900 400 412
414 449 -hsync +vsync (31.5 kHz)
[ 12.700] (II) RADEON(0): Modeline "640x350"x70.1 25.18 640 656 752 800 350 357
359 449 +hsync -vsync (31.5 kHz)
[ 12.700] (II) RADEON(0): Output DVI-0 connected
[ 12.700] (II) RADEON(0): Output S-video disconnected
[ 12.700] (II) RADEON(0): Output DVI-1 connected
->[ 12.700] (II) RADEON(0): Using exact sizes for initial modes
->[ 12.700] (II) RADEON(0): Output DVI-0 using initial mode 1280x1024
->[ 12.700] (II) RADEON(0): Output DVI-1 using initial mode 1280x1024
[ 12.700] (II) RADEON(0): Using default gamma of (1.0, 1.0, 1.0) unless
otherwise stated.
[ 12.700] (II) RADEON(0): mem size init: gart size :fdff000 vram size:
s:10000000 visible:fac0000
[ 12.700] (II) RADEON(0): EXA: Driver will allow EXA pixmaps in VRAM
the bad log:
[ 13.030] (II) RADEON(0): EDID for output DVI-1
[ 13.030] (II) RADEON(0): Printing probed modes for output DVI-1
[ 13.030] (II) RADEON(0): Modeline "1024x768"x60.0 65.00 1024 1048 1184 1344
768 771 777 806 -hsync -vsync (48.4 kHz)
[ 13.030] (II) RADEON(0): Modeline "800x600"x60.3 40.00 800 840 968 1056 600
601 605 628 +hsync +vsync (37.9 kHz)
[ 13.030] (II) RADEON(0): Modeline "800x600"x56.2 36.00 800 824 896 1024 600
601 603 625 +hsync +vsync (35.2 kHz)
[ 13.030] (II) RADEON(0): Modeline "848x480"x60.0 33.75 848 864 976 1088 480
486 494 517 +hsync +vsync (31.0 kHz)
[ 13.030] (II) RADEON(0): Modeline "640x480"x59.9 25.18 640 656 752 800 480 489
492 525 -hsync -vsync (31.5 kHz)
[ 13.030] (II) RADEON(0): Output DVI-0 connected
[ 13.030] (II) RADEON(0): Output S-video disconnected
[ 13.030] (II) RADEON(0): Output DVI-1 connected
->[ 13.030] (II) RADEON(0): Using fuzzy aspect match for initial modes
->[ 13.030] (II) RADEON(0): Output DVI-0 using initial mode 1024x768
->[ 13.030] (II) RADEON(0): Output DVI-1 using initial mode 1024x768
[ 13.030] (II) RADEON(0): Using default gamma of (1.0, 1.0, 1.0) unless
otherwise stated.
-> marks the different lines, and also the EDID for DVI-1 was a much shorter
list in the bad log, than the good log
then i recognized what could cause this: i usually switch on only the "main"
monitor, and leave the other powered off, this causes the EDID not be able to
read properly, which in turn makes the graphic driver to switch to a resolution
that fails
this theory was right, so i can use my computer now, just watch out for
having both monitors switched up
i suppose this behaviour is not normal, and i wrote this down here in
case others have the situation, help them
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1103162
Title:
after successful login got black screen, tty works
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1103162/+subscriptions
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