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Bug#480355: xserver-xorg: With KVM, screen not set to highest resolution



On Fri, 20 Jun 2008 07:20:16 +0200
Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:

> >
> > With an el-cheapo KVM a monitor (Compaq P110) and video card (ATI
> > Radeon 8500 QL) (= r200) that normally autodetect, don't.  Using
> > PreferredResolution in the Monitor section does the right thing.  I
> > don't know if this can be autodetected or not, but I'll provide
> > info to help in case it can. 
> 
> IIRC, the KVM can break the EDID and thus make autodetection fail. Can
> you try read-edid to compare the EDID with and without the KVM?
> 

I believe you are correct.  I have attached the output of get-edid with
kvm (edid-kvm) and without (edid-direct).

I don't suppose there is an easy way to get the monitor refresh rates
configured in xorg.conf that doesn't involve hunting the web for
appropriate values (and exactly whatever needs putting in the xorg.conf
anyway).  I have filed a bug about that - I think that when ddc is
unavailble that there should be a picker like the one that was in
dpkg-reconfigure xserver-xorg that allows one to pick a monitor type
(in the simple version), or monitor res and max vertical? refresh to
get those values for xorg.conf.  Or at least a good lookup table whose
location is clearly documented, preferably in xorg.conf.

Regards,

Daniel

-- 
And that's my crabbing done for the day.  Got it out of the way early, 
now I have the rest of the afternoon to sniff fragrant tea-roses or 
strangle cute bunnies or something.   -- Michael Devore
GnuPG Key Fingerprint 86 F5 81 A5 D4 2E 1F 1C      http://gnupg.org
No more sea shells:  Daniel's Weblog    http://cshore.wordpress.com

Attachment: edid-direct
Description: Binary data

Attachment: edid-kvm
Description: Binary data

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