*ERROR* EDID checksum is invalid, remainder is 26 - bad monitor frequence

[Alex Deucher]

On Sat, Jan 8, 2011 at 12:02 PM, debecio <debecio-debian at yahoo.it> wrote:
> Hello, I have this error in my dmesg. And my external monitor go to max vsync of 60hz (it support 85HZ).
> My hardware is eeepc with intel Intel GMA 3150 (driver is i915) on debian squeeze with:
>
> ii  libdrm-intel1                        2.4.23-0.0                           Userspace interface to intel-specific kernel DRM services -- runtime
> ii  xserver-xorg-video-intel             2:2.13.0-5                           X.Org X server -- Intel i8xx, i9xx display driver
> ii  xorg                                 1:7.5+8                              X.Org X Window System
> ii  xserver-xorg                         1:7.5+8                              the X.Org X server
> ii  xserver-xorg-core                    2:1.7.7-10                           Xorg X server - core server
>
> Kernel 2.6.36-02063602-generic take from ubuntu natty
> /var/log/Xorg.0.log don't have error concerning
> I don't habe /etc/X11/xorg.conf but I tried some tips on http://intellinuxgraphics.org/dualhead.html for force
> frequency but xorg ignore it.
> External monitor is old nec v72
>
> Can it fix this problem? It is very bad for my eyes :-)
> Thanks and excuse me for bad english

Try this patch and set drm.edid_strict=0 on the kernel command line in grub:
http://lists.freedesktop.org/archives/dri-devel/2011-January/006778.html

Alex

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