I wrote and now I'm answering my own post: > nate" <centos at linuxpowered.net> wrote: >> > David G. Miller wrote: >> > >> > >> >>>> >> > >>>> >> > Section "Device" >>>> >> > Identifier "Videocard0" >>>> >> > Driver "vesa" >>>> >> > EndSection >>>> >>> >> >>> >> > >> > [..] >> > >> > >> >>>> >> > and the video card is (this is a single card that shows up twice in lspci): >>>> >> > >>>> >> > 04:00.0 VGA compatible controller: ATI Technologies Inc RV516 [Radeon >>>> >> > X1300/X1550 Series] (prog-if 00 [VGA]) >>>> >>> >> >>> >> > >> > any particular reason why your using the vesa driver on what seems to >> > be a fairly recent ATI card instead of the ATI specific drivers? Perhaps >> > the vesa driver doesn't work as well with power management(never used it >> > myself for very long). >> > >> > I'd try the ATI drivers and see if it fixes the behavior, you'll probably >> > get much better performance at the same time, with perhaps a bit less >> > stability depending on what you do. >> > >> > nate >> > It's what the install configurator came up with and the ati driver > doesn't work with this video card (output from startx): > > ... > (WW) RADEON: No matching Device section for instance (BusID PCI:4:0:1) found > (WW) R128: No matching Device section for instance (BusID PCI:4:0:1) found > (EE) No devices detected. > > Fatal server error: > no screens found > XIO: fatal IO error 104 (Connection reset by peer) on X server ":0.0" > after 0 requests (0 known processed) with 0 events remaining. > > I like getting a new install stable and fully functional with open > source drivers before introducing perturbations like using a proprietary > display driver. That being said, I just installed the ATI proprietary > driver. So far the system is stable. I'll see whether the monitor > correctly goes to a low power mode tonight. The ATI proprietary driver seems to have fixed the problem. The monitor was in power save mode when I checked it this morning. The ATI Linux Driver wiki at http://wiki.cchtml.com/index.php/Red_Hat_Enterprise_Linux is very badly out of date. It has lots of dire warnings about things not working, work arounds required, etc. I pulled down the driver package from the ATI site, ran it to create a Red Hat rpm and installed the RPM. After I rebooted, everything just worked. I added some comments to the wiki to indicate that the problems described there only apply to RHEL/CentOS 5.0. Upgrading a 5.0 install to 5.1 or installing from 5.1 images and then installing the ATI proprietary driver is a piece of cake. It would be nice if the open source "ati" display driver got extended to include more recent ATI video cards. I'm now running a "tainted" kernel since I have the proprietary fglrx kernel module. Unfortunately, as with how this thread got started, lots of functionality isn't there with the "vesa" display driver. Cheers, Dave -- Politics, n. Strife of interests masquerading as a contest of principles. -- Ambrose Bierce