Berkeley CSUA MOTD:Entry 19157
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2025/04/04 [General] UID:1000 Activity:popular
4/4     

2000/9/2-6 [Computer/HW/Laptop] UID:19157 Activity:moderate
9/1     I use a laptop, and sometimes I hook it up to an external monitor.
        What do I do to allow me to use higher refresh rates on the ext.
        monitor under X in Linux and lower rates for the lcd screen?
        \_ This doesn't answer your question, but someone was trying
           to do the same thing with their Windoze laptop to a 19"
           screen and a roomful of grad students couldn't figure it out.
             \_ Have two files and copy the required one to XF86Config
                depending on which you wanna use then startx.  I believe
                this is the only answer, i don't think it can be changed
                with X running.
                \_ Doesn't the laptop LCD explode if the freq is set
                   too high? ^explode^exhibit unusual behavior
                   \_ Um.. yeah.. and i know a computer virus that cause HD
                      to implode...
        \_ for most chipsets, you must disable the lcd before setting
           higher rates for the external vga.. they use only one DAC
           and clock.  this usually requires restarting X with different
           driver options to actually disable the lcd (not just painting
           it w/ black pixels).

*/*
        \_ Different hardware.  Your graphics card is capable of higher
           refresh rate than the laptop screen, and only an external
           monitor can display this.  Laptop displays aren't real high-
           performance devices.  -John
           \_ Methinks John misread the question.
              \_ I did, sorry.  I saw "why".  See below.  -John
              \_ I did, sorry.  I saw "why", and was surprised at the
                 unusual absence of snide comments at a simple question on
                 the motd :-)  -Joh
        \_ You should set up your XF86Config with different "Monitor" sections
           with the different Modelines each supports (realistically one for
           the LCD, multiple for the ext. monitor), then make up a "Screen"
           section using each Monitor separately.  There's probably some
           relatively easy way of picking which "Screen" to use at startup..
           I've never tried.  --dbushong
2025/04/04 [General] UID:1000 Activity:popular
4/4     

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