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Xref: sserve comp.windows.x.i386unix:8490 comp.os.linux.misc:12742 comp.os.386bsd.apps:1132 Newsgroups: comp.windows.x.i386unix,comp.os.linux.misc,comp.os.386bsd.apps Path: sserve!newshost.anu.edu.au!munnari.oz.au!ihnp4.ucsd.edu!swrinde!cs.utexas.edu!howland.reston.ans.net!pipex!uknet!EU.net!CERN.ch!dxcern!danpop From: danpop@cernapo.cern.ch (Dan Pop) Subject: Re: Can't get 640x480 resolution with Linux at work. Message-ID: <1994Apr11.173252.20707@dxcern.cern.ch> Sender: danpop@dxcern.cern.ch (Dan Pop) Organization: CERN European Lab for Particle Physics References: <1994Apr11.155753.27343@news.csuohio.edu> Date: Mon, 11 Apr 1994 17:32:52 GMT Lines: 47 In <1994Apr11.155753.27343@news.csuohio.edu> thx1139@knuth.cba.csuohio.edu (tim werner) writes: >Hi, > >Can someone please help me with this disappointment? I will have a >ATI GUP w/ 4meg at home, but no one should have to put up with less >than 640x480, right? > >One of the guys where I work has just put Linux on a Spiral 486/50 >machine. This machine has 256k of video memory. > >He spent a couple of days going around with the configuration, and >decided that 560x420 was the best resolution he could get. > >He says that X uses 1k of the video memory for scratch, so 640x480 is >not possible. > >I find this hard to accept. How can a machine that can run Windows at >640x480 not work for X? There must be some trick to this, no? > >He runs "X -probeonly" to create the following /tmp/out, which shows a >clgd6235 chipset, whatever that is: > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >XFree86 Version 2.1 / X Window System >(protocol Version 11, revision 0, vendor release 5000) >Operating System: Linux >Configured drivers: > VGA256: server for 8-bit colour SVGA (Patchlevel 0): > et4000, et3000, pvga1, wd90c00, wd90c10, wd90c30, wd90c31, gvga, ati, > tvga8800cs, tvga8900b, tvga8900c, tvga8900cl, tvga9000, clgd5420, > clgd5422, clgd5424, clgd5426, clgd5428, clgd6205, clgd6215, clgd6225, > clgd6235, clgd543x, ncr77c22, ncr77c22e, cpq_avga, oti067, oti077 The VGA256 driver is using 8 bits per pixel. This means that for a resolution of 640x480 you need 307200 bytes, but the board has only 256K. If you use the VGA16 driver, you can get 640x480 at 4 bits per pixel, which is what MS Windows is giving you. Dan -- Dan Pop CERN, CN Division Email: danpop@cernapo.cern.ch Mail: CERN - PPE, Bat. 31 R-004, CH-1211 Geneve 23, Switzerland