Modesetting failure with kernel 3.15; ok with kernel 3.14

poma pomidorabelisima at
Thu Apr 17 19:30:02 UTC 2014

On 17.04.2014 20:26, Steven Usdansky wrote:
> Not sure where to report this problem (or what I should be looking for),
> but when booting any of the 3.15 kernels, kernel-modesetting fails and X
> comes up with a resolution of  1024x768, rather than the 1680x1050
> resolution specified in my xorg.conf file. xorg.conf is necessary because
> my monitor does not emit a proper EDID.
> ~$ uname -r
> kernel-3.15.0-0.rc1.git1.1.fc21.x86_64
> ~$ lspci | grep 9100
> 02:00.0 VGA compatible controller: NVIDIA Corporation C78 [GeForce 9100]
> (rev a2)
> Reverting to kernel -3.13.7-200.fc20.x86_64 avoids the problem (and
> problems I've been having with firefox-28 locking up with 3.14 kernels).


Section "Monitor"
    Identifier  "Broken EDID Monitor"
    Modeline    "1680x1050R" 119.00 1680 1728 1760 1840 1050 1053 1059
1080 +HSync -VSync
    Option      "PreferredMode" "1680x1050R"

Section "Device"
    Identifier  "GeForce 9100"
    Driver      "nouveau"
    Option      "Monitor-<outputname>" "Broken EDID Monitor"

Section "Screen"
    Identifier  "Default Screen"
    Device      "GeForce 9100"
    Monitor     "Broken EDID Monitor"

Section "ServerLayout"
   Identifier  "Default Layout"
   Screen      "Default Screen"

Dump the <outputname> via 'xrandr',
e.g. VGA-0, DVI-I-1, DVI-D-2, HDMI-A-3, etc.

man 5 xorg.conf
man 1 xrandr


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