I am encountering a video bug on my Fedora 13 desktop using the Radeon
driver. Once in a while, the screen goes blank in a way that hitting
a key or moving a mouse does not undo. I don't think that this
blanking is aligned with normal screen blanking.
I was given a suggestion. When this blanking has happened, I ssh
into this machine from another and issue the following commands. The
screen will then unblank:
DISPLAY=:0.0 xrandr --output DVI-1 --mode 1280x800
sleep 5
DISPLAY=:0.0 xrandr --output DVI-1 --mode 2560x1600
But that's not what I'm actually writing about -- that's just
preamble.
I want to be able to use ctrl-alt-+ or ctrl-alt-- to cycle between X
modes (resolutions etc). This should allow me to fix the display from
the keyboard of the afflicted machine by blindly typing ctrl-alt-+ twice
(with this display there are only two modelines synthesized by X).
ctrl-alt-+ does not work for me on F13. I don't know when it
disappeared. Perhaps when ctrl-alt-backspace was retired.
After spelunking, I find that there is an xorg.conf option "DontZoom"
that is similar the "DontZap" (the one that can allow
ctrl-alt-backspace to work again).
Of course that means you need an /etc/X11/xorg.conf, something that
has mostly disappeared with recent versions of the xorg system. You
can generate one by:
yum install system-config-display
system-config-display --noui
Then you edit in this section:
Section "ServerFlags"
Option "DontZoom" "false"
EndSection
There ought to be a better way just as there is for DontZap.
Worst of all, it still doesn't work. Even though /var/log/Xorg.0.log
shows that X accepted the option. I tried xev to find out what
keysyms were being generate:
KeyPress event, serial 33, synthetic NO, window 0x3800001,
root 0xf9, subw 0x0, time 23518785, (1400,548), root:(1662,639),
state 0x10, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyPress event, serial 33, synthetic NO, window 0x3800001,
root 0xf9, subw 0x0, time 23518788, (1400,548), root:(1662,639),
state 0x18, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 33, synthetic NO, window 0x3800001,
root 0xf9, subw 0x0, time 23521050, (1400,548), root:(1662,639),
state 0x1c, keycode 86 (keysym 0x1008fe22, XF86_Next_VMode), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
It looks as if the required keysym is being generated
(XF86_Next_VMode). Why isn't the screen resolution changed?
Is this documented anywhere?
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